diff --git a/JavaApplication1.java b/JavaApplication1.java
new file mode 100644
index 0000000..0920024
--- /dev/null
+++ b/JavaApplication1.java
@@ -0,0 +1,59 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package javaapplication1;
+
+import static jdk.nashorn.api.scripting.ScriptUtils.convert;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class JavaApplication1 {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        int a = 10;
+        int b = 52;
+        float x= 123.4556655f;
+        System.out.println(x);
+        
+        double dd = 456/45;
+        System.out.println(dd);
+        
+        String c = "parth";
+        String name = null;
+        System.out.println("name:"+c+" : "+name);
+        
+        int d =++b;
+        System.out.println(d);
+        
+        int e =b++;
+        System.out.println(e);
+        
+        int f = a--;
+        System.out.println(f);
+        
+        int g = --a;
+        System.out.println(g);
+        
+        int h = a+b;
+        System.out.println(h);
+        
+        int i = a-b;
+        System.out.println(f);
+        
+        int j = a*b;
+        System.out.println(j);
+        
+        int k = a/b;
+        System.out.println(k);
+        
+        boolean bl = true;
+        System.out.println(bl);
+        System.out.println(!bl);
+    } 
+}
diff --git a/Parth_Kharva/1D_Array_implementation.java b/Parth_Kharva/1D_Array_implementation.java
new file mode 100644
index 0000000..40d3511
--- /dev/null
+++ b/Parth_Kharva/1D_Array_implementation.java
@@ -0,0 +1,78 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package pkg1d_array;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Main {
+
+    /**
+     * @param args the command line arguments
+     */
+    
+    public static void main(String[] args) {
+        //types of array declaration
+        int a[];
+        int[] b = new int[10];
+        //assign a value in a two ways
+        int[] numbers = {178, 299, 375, 412, 5, 16, 78, 80, 91};//at compile time
+        //or
+        int[] no = new int[3];
+        no[0]=10;
+        no[1]=20;
+        no[2]=30;
+        
+        // print array Values:
+         System.out.println("Array values of no : ");
+        for(int x=0; x<no.length;x++){
+            System.out.println(no[x]);
+        }
+        
+
+        int check_no1 = 91;
+        int check_no2 = 9;
+        boolean match = false;
+        int i;
+        System.out.print("Your selected array Values : ");
+        for(i=0; i<numbers.length;i++){
+            System.out.print(numbers[i]+",");
+        }
+        
+        //find numbers according to our requirement
+        for (i = 0; i < numbers.length; i++) {
+            if (numbers[i] == check_no1) {
+                match = true;
+                break;
+            }
+        }
+        if (match == true){
+            System.out.println("\nyour requested Number : "+ check_no1+" is matched at index Position : "+i+"." );
+            match = false;
+        }
+        else{
+            System.out.println("your requested Number : "+ check_no1+" is not matched in the array." );
+        }
+        
+       
+        for (i = 0; i < numbers.length; i++) {
+            if (numbers[i] == check_no2) {
+                match = true;
+                break;
+            }
+        }
+        if (match == true){
+            System.out.println("your requested Number : "+ check_no2+" is matched at index Position : "+i+"." );
+            match = false;
+        }
+        else{
+            System.out.println("your requested Number : "+ check_no2+" is not matched in the array." );
+        }
+        
+        // Find length of the array
+        System.out.println("Full length of array is : "+numbers.length);
+    }
+}
diff --git a/Parth_Kharva/2D_Array_Implementation.java b/Parth_Kharva/2D_Array_Implementation.java
new file mode 100644
index 0000000..176d869
--- /dev/null
+++ b/Parth_Kharva/2D_Array_Implementation.java
@@ -0,0 +1,66 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package pkg2d_array;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Main {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        int[][] a = new int[3][3];//int[ROW][COLUMN](Basically this is a 3x3 matrics.)
+        int i;
+        
+        System.out.println("Before inserted value :");
+        for(i=0; i<a.length;i++){
+            for(int j=0; j<a.length;j++){
+                System.out.print(a[i][j]);
+            }  
+            System.out.print("\n");
+        }
+        System.out.print("\n");
+        System.out.println("After inserted value :");
+        
+        // set value at index [3][2] Means 3rd row and 2 column
+        a[2][2] = 45;
+        
+        for(i=0; i<a.length;i++){
+            for(int j=0; j<a.length;j++){
+                System.out.print(a[i][j]);
+            }  
+            System.out.print("\n");
+        }
+        System.out.print("\n");
+        
+        //define String array creation
+        String[][] data = {{"First Name","Last Name"},{"Parth","Kharva"},{"Ashish","Patel"}};
+       System.out.println("Before change value :");
+        // display value
+        for(i=0; i<3;i++){
+            for(int j=0; j<2;j++){
+                System.out.print(data[i][j]+" ");
+            }  
+            System.out.print("\n");
+        }
+        System.out.print("\n");
+        
+        //change value
+        data[2][1] = "Kharva";
+        
+        System.out.println("after change a value :");
+        // display value
+        for(i=0; i<3;i++){
+            for(int j=0; j<2;j++){
+                System.out.print(data[i][j]+" ");
+            }  
+            System.out.print("\n");
+        }
+        
+    }
+}
diff --git a/Parth_Kharva/Access Specifier/Class1.java b/Parth_Kharva/Access Specifier/Class1.java
new file mode 100644
index 0000000..6ee7f44
--- /dev/null
+++ b/Parth_Kharva/Access Specifier/Class1.java	
@@ -0,0 +1,16 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package access_specifer;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class asscess_specifer_creation {
+    public int a = 45;
+    private int b =96;
+    protected int c = 78;
+    int d = 80;
+}
diff --git a/Parth_Kharva/Access Specifier/Main class.java b/Parth_Kharva/Access Specifier/Main class.java
new file mode 100644
index 0000000..650fe57
--- /dev/null
+++ b/Parth_Kharva/Access Specifier/Main class.java	
@@ -0,0 +1,25 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package access_specifer;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Access_specifer extends asscess_specifer_creation{
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        Access_specifer obj1 = new Access_specifer();
+        System.out.println(obj1.a);
+        System.out.println(obj1.c);
+        System.out.println(obj1.d);
+        System.out.println(obj1.b);
+        
+    }
+    
+}
diff --git a/Parth_Kharva/DRDO Cryptography and Cryptanalysis Project/Implement Caesar Cipher in Java/Encryption_&_Decryption_Portion_Of _Caesar_Cipher.java b/Parth_Kharva/DRDO Cryptography and Cryptanalysis Project/Implement Caesar Cipher in Java/Encryption_&_Decryption_Portion_Of _Caesar_Cipher.java
new file mode 100644
index 0000000..cfefeae
--- /dev/null
+++ b/Parth_Kharva/DRDO Cryptography and Cryptanalysis Project/Implement Caesar Cipher in Java/Encryption_&_Decryption_Portion_Of _Caesar_Cipher.java	
@@ -0,0 +1,92 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package caesarciphe;
+
+import java.util.Scanner;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Caesarciphe {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static String Encrypt(String text, int positions) {
+        String toEncrypt = "", result = "";
+        //Message encrypted
+        for (int i = 0; i < text.length(); i++) {
+            //remove spacings 
+
+            if (text.charAt(i) == ' ') {
+                continue;
+            } else {
+                //convert lowercase to uppercase
+                if (Character.isLowerCase(text.charAt(i))) {
+                    toEncrypt += Character.toUpperCase(text.charAt(i));
+                } //if already uppercase keep the uppercase character
+                else {
+                    toEncrypt += text.charAt(i);
+                }
+            }
+        }
+        for (int i = 0; i < toEncrypt.length(); i++) {
+            //shift the current letter of the message with given positions from right.
+            char shiftedLetter = (char) (toEncrypt.charAt(i) + positions);
+
+            //if the ASCII code exceeds Z, then bring it back in the interval A..Z
+            if (shiftedLetter > 'Z') {
+                shiftedLetter = (char) (shiftedLetter + 'A' - 'Z' - 1);
+            }
+            result += shiftedLetter;
+        }
+        return result;
+    }
+
+    public static String Decrypt(String text, int positions) {
+        //encrypted code is already uppercase,
+        String result = "";
+        for (int i = 0; i < text.length(); i++) {
+
+            //shift the current letter of the message with given positions to left
+            char shiftedLetter = (char) (text.charAt(i) - positions);
+
+            //if the ASCII code exceeds A, then bring it back in the interval A..Z
+            if (shiftedLetter < 'A') {
+                shiftedLetter = (char) (shiftedLetter - 'A' + 'Z' + 1);
+            }
+            result += shiftedLetter;
+
+        }
+
+        return result;
+    }
+
+    public static void main(String[] args) {
+        //message input code
+        System.out.println("CAESAR CIPHER");
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Type Your Important Message : ");
+        String message = sc.nextLine();
+        System.out.print("Type the key: ");
+        int key = sc.nextInt();
+        sc.close();
+        System.out.println("\n");
+
+        //  message Encryption code
+        System.out.println("Process : Encrypting...");
+        String encryptedMessage = Encrypt(message, key);
+        System.out.println("The encrypted message is: " + encryptedMessage);
+        System.out.println("\n");
+        System.out.println("Process : Encryption Complete...");
+        
+        //  message Dencryption code
+        System.out.println("Process : Decrypting...");
+        String restoredMessage = Decrypt(encryptedMessage, key);
+        System.out.println("The Decrypted message is: " + restoredMessage);
+        System.out.println("Process : Decryption Complete...");
+    }
+}
diff --git a/Parth_Kharva/DRDO Cryptography and Cryptanalysis Project/Implement Caesar Cipher in Java/Encryption_Portion_Of _Caesar_Cipher.java b/Parth_Kharva/DRDO Cryptography and Cryptanalysis Project/Implement Caesar Cipher in Java/Encryption_Portion_Of _Caesar_Cipher.java
new file mode 100644
index 0000000..b3351d5
--- /dev/null
+++ b/Parth_Kharva/DRDO Cryptography and Cryptanalysis Project/Implement Caesar Cipher in Java/Encryption_Portion_Of _Caesar_Cipher.java	
@@ -0,0 +1,69 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package caesarciphe;
+
+import java.util.Scanner;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Caesarciphe {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static String Encrypt(String text, int positions) {
+        String toEncrypt = "";
+        String result = "";
+        //Message encrypted
+        for (int i = 0; i < text.length(); i++) {
+            //remove spacings 
+
+            if (text.charAt(i) == ' ') {
+                continue;
+            } else {
+                //convert lowercase to uppercase
+                if (Character.isLowerCase(text.charAt(i))) {
+                    toEncrypt += Character.toUpperCase(text.charAt(i));
+                } //if already uppercase keep the uppercase character
+                else {
+                    toEncrypt += text.charAt(i);
+                }
+            }
+        }
+        for (int i = 0; i < toEncrypt.length(); i++) {
+            //shift the current letter of the message with given positions from right.
+            char shiftedLetter = (char) (toEncrypt.charAt(i) + positions);
+
+            //if the ASCII code exceeds Z, then bring it back in the interval A..Z
+            if (shiftedLetter > 'Z') {
+                shiftedLetter = (char) (shiftedLetter + 'A' - 'Z' - 1);
+            }
+
+            result += shiftedLetter;
+        }
+
+        return result;
+    
+    }
+    public static void main(String[] args) {
+        //message input code
+        System.out.println("CAESAR CIPHER");
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Type Your Important Message : ");
+        String message = sc.nextLine();
+        System.out.println("Type the key: ");
+        int key = sc.nextInt();
+        sc.close();
+        System.out.println("\n");
+
+        //  message Encrytion code
+        System.out.println("Encrypting...");
+        String encryptedMessage = Encrypt(message, key);
+        System.out.println("The encrypted message is: " +encryptedMessage);
+    }
+
+}
diff --git a/Parth_Kharva/Data Structure/Advance_Exception_Handling.java b/Parth_Kharva/Data Structure/Advance_Exception_Handling.java
new file mode 100644
index 0000000..48dbcd3
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Advance_Exception_Handling.java	
@@ -0,0 +1,55 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package finally_block_exception_handling;
+
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Finally_block_exception_handling {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        try{
+        System.out.println("-: Welcome to my Addition Calculator Tool :-");
+        Scanner sc = new Scanner(System.in);
+
+        System.out.println("Please Enter First Numeric Value :");
+        int no1 = sc.nextInt();
+
+        System.out.println("Please Enter Second Numeric Value :");
+        int no2 = sc.nextInt();
+
+        int op = addition(no1, no2);
+        System.out.println("The Output is : "+op+".");
+        }
+        catch(InputMismatchException e){
+            System.out.println("Please Enter Intiger Only.");
+        }
+        finally{
+            System.out.println("Intiger Not Found.");
+        }
+    }
+    
+    public static int addition(int a, int b){
+        int add = 0;
+        try{
+            add = a+b;
+        }
+        catch(Exception e){
+            System.out.println("Please Enter Intiger Only.");
+        }
+        finally{
+            System.out.println("This is a finally block.");
+        }
+        return add;
+    }
+
+}
diff --git a/Parth_Kharva/Data Structure/ArrayDeque.java b/Parth_Kharva/Data Structure/ArrayDeque.java
new file mode 100644
index 0000000..51cf253
--- /dev/null
+++ b/Parth_Kharva/Data Structure/ArrayDeque.java	
@@ -0,0 +1,40 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package stack_using_arraydeque;
+
+import java.util.ArrayDeque;
+import java.util.Iterator;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Stack_using_arraydeque {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        
+        ArrayDeque mydeque = new ArrayDeque<String>();
+        mydeque.add("Ashish");
+        mydeque.addFirst("Parth");
+        mydeque.addLast("Parit");
+        mydeque.offerFirst("Riya");
+        mydeque.offer("Piya");
+        
+        System.out.println("First Element : "+mydeque.getFirst());
+        System.out.println("Last Element : "+mydeque.getLast());
+        System.out.println("Deque Contains 'Parth' : "+mydeque.contains("Parth"));
+        System.out.println("Iterating All The Elements In Decending Order : ");
+        Iterator<String> myiterator = mydeque.descendingIterator();
+        
+        while(myiterator.hasNext()){
+            System.out.println(myiterator.next());
+        }
+        
+    }
+    
+}
diff --git a/Parth_Kharva/Data Structure/Array_List.java b/Parth_Kharva/Data Structure/Array_List.java
new file mode 100644
index 0000000..20a6aee
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Array_List.java	
@@ -0,0 +1,55 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package arraylist;
+
+import java.util.ArrayList;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class array_list {
+    public static void main(String[] args) {
+        // TODO code application logic here
+        System.out.println("My Array list :");
+        ArrayList myarraylist = new ArrayList();
+        myarraylist.add(1);//starting index 0
+        myarraylist.add(2);
+        myarraylist.add(3);
+        
+        System.out.println(myarraylist.get(0));
+        System.out.println(myarraylist.get(1));
+        System.out.println(myarraylist.get(2));
+        
+        myarraylist.add(2,89);//change at index 2
+        System.out.println("My UPdated element is : "+ myarraylist.get(2)+"\n");
+        System.out.println("My Updated Array list :");
+
+        ArrayList myarraylist2 = new ArrayList();
+        myarraylist2.addAll(myarraylist);
+        System.out.println(myarraylist2.get(0));
+        System.out.println(myarraylist2.get(1));
+        System.out.println(myarraylist2.get(2));
+        System.out.println(myarraylist2.get(3)+"\n");
+        
+        myarraylist2.clear();
+        try{
+        System.out.println(myarraylist2.get(0));
+        System.out.println(myarraylist2.get(1));
+        System.out.println(myarraylist2.get(2));
+        System.out.println(myarraylist2.get(3));
+        }
+        catch(IndexOutOfBoundsException e){
+            System.out.println("My array List is clear. \n");
+        }
+        
+        ArrayList clonelist = (ArrayList) myarraylist.clone();
+        System.out.println("My Clone List :");
+        System.out.println(myarraylist.get(0));
+        System.out.println(myarraylist.get(1));
+        System.out.println(myarraylist.get(2));
+        System.out.println(myarraylist.get(3));
+    }
+}
diff --git a/Parth_Kharva/Data Structure/Array_List_Parallel_Processing_Using_Spliterator.java b/Parth_Kharva/Data Structure/Array_List_Parallel_Processing_Using_Spliterator.java
new file mode 100644
index 0000000..5ae9f5a
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Array_List_Parallel_Processing_Using_Spliterator.java	
@@ -0,0 +1,50 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package arraylist_parallel_processing_using_spliterator;
+
+import java.util.ArrayList;
+import java.util.Spliterator;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Arraylist_parallel_processing_using_spliterator {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        ArrayList<String> insta_post = new ArrayList<String>();
+        
+        insta_post.add("post1");
+        insta_post.add("post2");
+        insta_post.add("post3");
+        insta_post.add("post4");
+        insta_post.add("post5");
+        insta_post.add("post6");
+        
+        Spliterator<String> spl1 = insta_post.spliterator();
+        Spliterator<String> spl2 = spl1.trySplit();
+        System.out.println("SPL1 Estimated size of data : "+spl1.estimateSize());
+        System.out.println("SPL1 Exact size : "+spl1.getExactSizeIfKnown());
+        
+        spl1.forEachRemaining(System.out::println);
+        
+        System.out.println("SPL1 Estimated size of data : "+spl1.estimateSize());
+        System.out.println("SPL1 Exact size : "+spl1.getExactSizeIfKnown());
+        
+        System.out.println("SPL2 Estimated size of data : "+spl2.estimateSize());
+        System.out.println("SPL2 Exact size : "+spl2.getExactSizeIfKnown());
+        
+        spl2.forEachRemaining(System.out::println);
+        
+        System.out.println("SPL1 Estimated size of data : "+spl1.estimateSize());
+        System.out.println("SPL1 Exact size : "+spl1.getExactSizeIfKnown());
+        
+        
+    }
+    
+}
diff --git a/Parth_Kharva/Data Structure/Binary_tree_Creation_Insertion_Traversal.java b/Parth_Kharva/Data Structure/Binary_tree_Creation_Insertion_Traversal.java
new file mode 100644
index 0000000..0835a7f
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Binary_tree_Creation_Insertion_Traversal.java	
@@ -0,0 +1,81 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package binary_tree_creation_insert_traversal;
+
+import binary_tree_creation_insert_traversal.Binary_tree_creation_insert_traversal.Tree.Node;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Binary_tree_creation_insert_traversal {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        Tree tree = new Tree();
+        Node root = new Node(50);
+        tree.insert(root, 12);
+        tree.insert(root, 1);
+        tree.insert(root, 26);
+        tree.insert(root, 10);
+        tree.insert(root, 2);
+        tree.insert(root, 62);
+        tree.insert(root, 152);
+        tree.insert(root, 129);
+        tree.insert(root, 17);
+        tree.insert(root, 100);
+        
+        System.out.println("Travers the tree :");
+        tree.traversal_inorder(root);
+    }
+
+    public static class Tree {
+
+        static class Node {
+
+            int value;
+            Node left, right;
+
+            Node(int value) {
+                this.value = value;
+
+                left = null;
+                right = null;
+            }
+
+        }
+        public void insert(Node node,int value){
+            if(value<node.value){
+                if(node.left != null){
+                    insert(node.left,value);
+                }
+                else{
+                    System.out.println("Insert "+value +" to the left of "+node.value+".");
+                    node.left = new Node(value);
+                }
+            }
+            else if(value>node.value){
+                if(node.right != null){
+                    insert(node.right,value);
+                }
+                else{
+                    System.out.println("Insert "+value +" to the right of "+node.value+".");
+                    node.right = new Node(value);
+                }
+            } 
+        }
+        
+        public void traversal_inorder(Node node){
+            if(node != null){
+                traversal_inorder(node.left);
+                System.out.println(" "+node.value);
+                traversal_inorder(node.right);
+            }
+        }
+    }
+
+}
diff --git a/Parth_Kharva/Data Structure/Binary_tree_Pre-order_&_Post-oder_Traversal.java b/Parth_Kharva/Data Structure/Binary_tree_Pre-order_&_Post-oder_Traversal.java
new file mode 100644
index 0000000..0e360df
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Binary_tree_Pre-order_&_Post-oder_Traversal.java	
@@ -0,0 +1,101 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package binary_tree_creation_insert_traversal;
+
+import binary_tree_creation_insert_traversal.Binary_tree_creation_insert_traversal.Tree.Node;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Binary_tree_creation_insert_traversal {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        Tree tree = new Tree();
+        Node root = new Node(50);
+        tree.insert(root, 12);
+        tree.insert(root, 1);
+        tree.insert(root, 26);
+        tree.insert(root, 10);
+        tree.insert(root, 2);
+        tree.insert(root, 62);
+        tree.insert(root, 152);
+        tree.insert(root, 129);
+        tree.insert(root, 17);
+        tree.insert(root, 100);
+        
+        System.out.println("Travers the tree :");
+        tree.traversal_inorder(root);
+        
+        System.out.println("Travers the tree in pre-order :");
+        tree.traversal_preorder(root);
+        
+        System.out.println("Travers the tree in post-order :");
+        tree.traversal_postorder(root);
+    }
+
+    public static class Tree {
+
+        static class Node {
+
+            int value;
+            Node left, right;
+
+            Node(int value) {
+                this.value = value;
+
+                left = null;
+                right = null;
+            }
+
+        }
+        public void insert(Node node,int value){
+            if(value<node.value){
+                if(node.left != null){
+                    insert(node.left,value);
+                }
+                else{
+                    System.out.println("Insert "+value +" to the left of "+node.value+".");
+                    node.left = new Node(value);
+                }
+            }
+            else if(value>node.value){
+                if(node.right != null){
+                    insert(node.right,value);
+                }
+                else{
+                    System.out.println("Insert "+value +" to the right of "+node.value+".");
+                    node.right = new Node(value);
+                }
+            } 
+        }
+        
+        public void traversal_inorder(Node node){
+            if(node != null){
+                traversal_inorder(node.left);
+                System.out.println(" "+node.value);
+                traversal_inorder(node.right);
+            }
+        }
+        public void traversal_preorder(Node node){
+            if(node != null){
+                System.out.println(" "+node.value);
+                traversal_inorder(node.left);
+                traversal_inorder(node.right);
+            }
+        }
+        public void traversal_postorder(Node node){
+            if(node != null){
+                traversal_inorder(node.left);
+                traversal_inorder(node.right);
+                System.out.println(" "+node.value);;
+            }
+        }
+    }
+
+}
diff --git a/Parth_Kharva/Data Structure/Chained_Exception.java b/Parth_Kharva/Data Structure/Chained_Exception.java
new file mode 100644
index 0000000..f5b5733
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Chained_Exception.java	
@@ -0,0 +1,38 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package chainedexception;
+
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class ChainedException {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        try{
+            System.out.println("-: Welcome To My Weight Checking Tool :-");
+            Scanner sc = new Scanner(System.in);
+            
+            System.out.print("Please Enter Your height in centimeters:");
+            float height = sc.nextFloat();
+            double idealweight = 50 + (0.91 * (height - 152.4));
+            
+            System.out.println("Your Ideal Weight Should be "+idealweight+" KG.");
+        }
+        catch(InputMismatchException e){
+            throw new NumberFormatException();
+        }
+        finally{
+            System.out.println("-: Thank You For Using My Tool :-");
+        }
+    }
+    
+}
diff --git a/Parth_Kharva/Data Structure/Exception_Handling.java b/Parth_Kharva/Data Structure/Exception_Handling.java
new file mode 100644
index 0000000..e24eb19
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Exception_Handling.java	
@@ -0,0 +1,37 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package exception_handling;
+
+import java.util.InputMismatchException;
+import java.util.Scanner;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Exception_handling {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        try{
+            System.out.println("-: Welcome to my Heart Rate Calculator Tool :-");
+            Scanner sc = new Scanner(System.in);
+            
+            System.out.println("Please Enter Your Right Age Sir/Ma'am :");
+            int age = sc.nextInt();
+            int MaxRate = 220 - age;
+            
+            System.out.println("Your Maximum Heart Rate Should be: "+MaxRate+".");
+            System.out.println("-: Thank You For Using My Tool :-");
+        }
+        catch(InputMismatchException e){
+            System.out.println("Please Enter Your Age In Numeric Formate, Please Try Again.");
+        }
+        
+    }
+    
+}
diff --git a/Parth_Kharva/Data Structure/List_Interface.java b/Parth_Kharva/Data Structure/List_Interface.java
new file mode 100644
index 0000000..08358f8
--- /dev/null
+++ b/Parth_Kharva/Data Structure/List_Interface.java	
@@ -0,0 +1,140 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package list_interface;
+
+import java.util.Collection;
+import java.util.Iterator;
+import java.util.List;
+import java.util.ListIterator;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class List_interface implements List<String>{
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        // TODO code application logic here
+    }
+
+    @Override
+    public int size() {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public boolean isEmpty() {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public boolean contains(Object o) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public Iterator<String> iterator() {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public Object[] toArray() {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public <T> T[] toArray(T[] a) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public boolean add(String e) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public boolean remove(Object o) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public boolean containsAll(Collection<?> c) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public boolean addAll(Collection<? extends String> c) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public boolean addAll(int index, Collection<? extends String> c) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public boolean removeAll(Collection<?> c) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public boolean retainAll(Collection<?> c) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public void clear() {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public String get(int index) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public String set(int index, String element) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public void add(int index, String element) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public String remove(int index) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public int indexOf(Object o) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public int lastIndexOf(Object o) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public ListIterator<String> listIterator() {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public ListIterator<String> listIterator(int index) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+
+    @Override
+    public List<String> subList(int fromIndex, int toIndex) {
+        throw new UnsupportedOperationException("Not supported yet."); // Generated from nbfs://nbhost/SystemFileSystem/Templates/Classes/Code/GeneratedMethodBody
+    }
+    
+}
diff --git a/Parth_Kharva/Data Structure/Node.java b/Parth_Kharva/Data Structure/Node.java
new file mode 100644
index 0000000..3fe7f2f
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Node.java	
@@ -0,0 +1,32 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package node_creation.trees_basic;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Node_CreationTrees_basic {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        Node node = new Node(15);
+        node.left = new Node(12);
+        node.right = new Node(29);
+    }
+    static class Node{
+        int value;
+        Node left,right;
+        Node(int value){
+            this.value = value;
+            
+            left = null;
+            right = null;
+        }
+    }
+    
+}
diff --git a/Parth_Kharva/Data Structure/Priority Queue/PriorityQueue_MainClass.java b/Parth_Kharva/Data Structure/Priority Queue/PriorityQueue_MainClass.java
new file mode 100644
index 0000000..74b484b
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Priority Queue/PriorityQueue_MainClass.java	
@@ -0,0 +1,51 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package priority_queue;
+
+import java.util.Iterator;
+import java.util.PriorityQueue;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Priority_queue {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        PriorityQueue pq = new PriorityQueue();
+        System.out.println("Is PQ Empty : "+pq.isEmpty());
+        
+        new_Comparator_Of_PQ new_compar = new new_Comparator_Of_PQ();
+        PriorityQueue pq1 = new PriorityQueue(new_compar);
+        
+        pq.add(34);
+        pq1.add(34);
+        
+        pq.add(26);
+        pq1.add(26);
+        
+        pq.add(1);
+        pq1.add(1);
+        
+        pq.add(100);
+        pq1.add(100);
+        
+        Iterator pq_it = pq.iterator();
+        Iterator pq1_it = pq1.iterator();
+        System.out.println("PQ Priority Queue :");
+        while(pq_it.hasNext()){
+            System.out.println(pq_it.next());
+        }
+        System.out.println("PQ1 Priority Queue :");
+        while(pq1_it.hasNext()){
+            System.out.println(pq1_it.next());
+        }
+
+    }
+    
+}
diff --git a/Parth_Kharva/Data Structure/Priority Queue/comparatorclass.java b/Parth_Kharva/Data Structure/Priority Queue/comparatorclass.java
new file mode 100644
index 0000000..b392ff3
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Priority Queue/comparatorclass.java	
@@ -0,0 +1,22 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package priority_queue;
+
+import java.util.Comparator;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class new_Comparator_Of_PQ implements Comparator<Integer> {
+    public int compare(Integer p1, Integer p2){
+        if(p1>=p2){
+            return p1;
+        }
+        else{
+            return p2;
+        }
+    }
+}
diff --git a/Parth_Kharva/Data Structure/Single And Multipal Inheritance/BMI_Class.java b/Parth_Kharva/Data Structure/Single And Multipal Inheritance/BMI_Class.java
new file mode 100644
index 0000000..1653ea6
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Single And Multipal Inheritance/BMI_Class.java	
@@ -0,0 +1,19 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package single_._multipal_inheritance;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class BMI_Mechine_Result extends Single__multipal_inheritance{
+    public static void main(String[] args){
+        System.out.println(getMax_Heart_Rate(45));
+    }
+    public static int getMax_Heart_Rate(int age){
+        System.out.println("This is the BMI Mechine Generated Heart Rate Result :");
+        return 230 - age ;
+    }
+}
diff --git a/Parth_Kharva/Data Structure/Single And Multipal Inheritance/class1.java b/Parth_Kharva/Data Structure/Single And Multipal Inheritance/class1.java
new file mode 100644
index 0000000..0738913
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Single And Multipal Inheritance/class1.java	
@@ -0,0 +1,29 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package single_._multipal_inheritance;
+
+import static single_._multipal_inheritance.BMI_Mechine_Result.getMax_Heart_Rate;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Single__multipal_inheritance {
+
+    /**
+     * @param args the command line arguments
+     */
+    public String maximum_heart_rate;
+    public static void main(String[] args) {
+        System.out.println(getMax_Heart_Rate(45));
+    }
+    public static int getMax_Heart_Rate(int age){
+        int result = 0;
+        result = 220 - age;
+        System.out.print("This is the base class Generated Heart Rate Result :");
+        return result;
+    }
+    
+}
diff --git a/Parth_Kharva/Data Structure/Stack.java b/Parth_Kharva/Data Structure/Stack.java
new file mode 100644
index 0000000..2af41d2
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Stack.java	
@@ -0,0 +1,30 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package My_Stack;
+
+import java.util.Stack;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class My_Stack {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        // TODO code application logic here
+        Stack instack = new Stack<Integer>();
+        System.out.println("Is Stack Empty : "+instack.empty());
+        instack.push(40);
+        instack.push(2);
+        System.out.println("Get the top element : "+instack.peek());
+        System.out.println("Is Stack Contains 2 : "+instack.search(2));
+        instack.pop();
+        System.out.println("Top element after pop operation : "+instack.peek());
+    }
+    
+}
diff --git a/Parth_Kharva/Data Structure/Throw_Exception.java b/Parth_Kharva/Data Structure/Throw_Exception.java
new file mode 100644
index 0000000..85a572f
--- /dev/null
+++ b/Parth_Kharva/Data Structure/Throw_Exception.java	
@@ -0,0 +1,35 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package throw_exception;
+
+import java.util.Scanner;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Throw_exception {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        System.out.println("-: Welcome to my Heart Rate Calculator Tool :-");
+        Scanner sc = new Scanner(System.in);
+
+        System.out.println("Please Enter Your Right Age Sir/Ma'am :");
+        int age = sc.nextInt();
+
+        if (age <= 0) {
+            throw new NumberFormatException();
+        } else if (age >= 120) {
+            throw new NumberFormatException();
+        }
+        int MaxRate = 220 - age;
+        System.out.println("Your Maximum Heart Rate Should be: " + MaxRate + ".");
+        System.out.println("-: Thank You For Using My Tool :-");
+    }
+
+}
diff --git a/Parth_Kharva/Data Structure/ToArray_Function.java b/Parth_Kharva/Data Structure/ToArray_Function.java
new file mode 100644
index 0000000..660f0ab
--- /dev/null
+++ b/Parth_Kharva/Data Structure/ToArray_Function.java	
@@ -0,0 +1,31 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package to_array_function;
+
+import java.util.ArrayList;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class To_array_function {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        ArrayList<String> team_member = new ArrayList<String>();
+        
+        team_member.add("Parth");
+        team_member.add("Ashish");
+        team_member.add("Parit");
+        team_member.add("Atmiya");
+        team_member.add("Arpit");
+        Object[] array_team_member = team_member.toArray();
+        System.out.println("Element At Index '0' For Array: "+array_team_member[0]);
+        System.out.println("HasCode Of The Array: "+array_team_member.hashCode());
+    }
+    
+}
diff --git a/Parth_Kharva/Data Structure/bfs_traversal.java b/Parth_Kharva/Data Structure/bfs_traversal.java
new file mode 100644
index 0000000..46d0276
--- /dev/null
+++ b/Parth_Kharva/Data Structure/bfs_traversal.java	
@@ -0,0 +1,138 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package bfs_traversal;
+
+import bfs_traversal.Bfs_traversal.Tree.Node;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Bfs_traversal {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        Tree tree = new Tree();
+        Node root = new Node(50);
+        tree.insert(root, 12);
+        tree.insert(root, 1);
+        tree.insert(root, 26);
+        tree.insert(root, 10);
+        tree.insert(root, 2);
+        tree.insert(root, 62);
+        tree.insert(root, 152);
+        tree.insert(root, 129);
+        tree.insert(root, 17);
+        tree.insert(root, 100);
+        
+        System.out.println("Travers the tree :");
+        tree.traversal_inorder(root);
+        
+        System.out.println("Travers the tree in pre-order :");
+        tree.traversal_preorder(root);
+        
+        System.out.println("Travers the tree in post-order :");
+        tree.traversal_postorder(root);
+        
+        System.out.println("Breadth First Search / Level Order :");
+        tree.bfs(root);
+    }
+
+    public static class Tree {
+
+        static class Node {
+
+            int value;
+            Node left, right;
+
+            Node(int value) {
+                this.value = value;
+
+                left = null;
+                right = null;
+            }
+
+        }
+        public void insert(Node node,int value){
+            if(value<node.value){
+                if(node.left != null){
+                    insert(node.left,value);
+                }
+                else{
+                    System.out.println("Insert "+value +" to the left of "+node.value+".");
+                    node.left = new Node(value);
+                }
+            }
+            else if(value>node.value){
+                if(node.right != null){
+                    insert(node.right,value);
+                }
+                else{
+                    System.out.println("Insert "+value +" to the right of "+node.value+".");
+                    node.right = new Node(value);
+                }
+            } 
+        }
+        
+        public void traversal_inorder(Node node){
+            if(node != null){
+                traversal_inorder(node.left);
+                System.out.println(" "+node.value);
+                traversal_inorder(node.right);
+            }
+        }
+        public void traversal_preorder(Node node){
+            if(node != null){
+                System.out.println(" "+node.value);
+                traversal_inorder(node.left);
+                traversal_inorder(node.right);
+            }
+        }
+        public void traversal_postorder(Node node){
+            if(node != null){
+                traversal_inorder(node.left);
+                traversal_inorder(node.right);
+                System.out.println(" "+node.value);
+            }
+        }
+        
+        public int height(Node root){
+            if(root == null){
+                return 0;
+            }
+            else{
+                int left_height = height(root.left);
+                int right_height = height(root.right);
+                if(left_height > right_height){
+                    return(left_height + 1);
+                }
+                else{
+                    return(right_height + 1);
+                }
+            }
+        }
+        public void printCurrentlevel(Node root, int level){
+            if(root == null){
+                return;
+            }
+            if(level == 1){
+                System.out.println(root.value + " ");
+            }
+            else if(level<1){
+                printCurrentlevel(root.left,level-1);
+                printCurrentlevel(root.right,level-1);
+            }
+        }
+        public void bfs(Node root){
+            int h = height(root);
+            for(int i=1; i<=h; i++){
+                printCurrentlevel(root,i);
+            }
+        }
+    }
+    
+}
diff --git a/Parth_Kharva/Encapsulation_With_Access_Specifer.java b/Parth_Kharva/Encapsulation_With_Access_Specifer.java
new file mode 100644
index 0000000..b6addaf
--- /dev/null
+++ b/Parth_Kharva/Encapsulation_With_Access_Specifer.java
@@ -0,0 +1,28 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package encapsulation;
+
+/**
+ *
+ * @author Parthkharva
+ */
+
+class ab{
+ private int a = 85;
+ public int xy = 41;
+ 
+}
+public class Encapsulation extends ab{
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        Encapsulation obj =new  Encapsulation();
+        System.out.println("xy="+obj.xy);
+        System.out.println("a="+obj.a);
+    }
+    
+}
diff --git a/Parth_Kharva/Fiind_Mean_values_using_1D_Array.java b/Parth_Kharva/Fiind_Mean_values_using_1D_Array.java
new file mode 100644
index 0000000..c63b29a
--- /dev/null
+++ b/Parth_Kharva/Fiind_Mean_values_using_1D_Array.java
@@ -0,0 +1,26 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package find_mean_with_1d_array;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class find_mean_with_1d_array {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        int[] num = new int[2];
+        num[0]=34;
+        num[1]=24;
+        
+        int mean = (num[0]+num[1])/2;
+        
+        System.out.println("Two array values of mean is : "+mean+".");
+    }
+    
+}
diff --git a/Parth_Kharva/Inharitance.java b/Parth_Kharva/Inharitance.java
new file mode 100644
index 0000000..2c27951
--- /dev/null
+++ b/Parth_Kharva/Inharitance.java
@@ -0,0 +1,34 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package inharitance;
+
+/**
+ *
+ * @author Parthkharva
+ */
+class a{
+    int x =90;
+    public void value1(){
+        System.out.println("this is a class A");
+    }
+}
+class b extends a{
+    public void value2(){
+        System.out.println("this is a class B");
+    }
+}
+public class Inharitance extends b{
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        b obj = new b();
+        obj.value1();
+        obj.value2();
+        System.out.println("class a variable x value is :"+obj.x);
+    }
+    
+}
diff --git a/Parth_Kharva/Lambda/Main_class.java b/Parth_Kharva/Lambda/Main_class.java
new file mode 100644
index 0000000..b6f11fa
--- /dev/null
+++ b/Parth_Kharva/Lambda/Main_class.java
@@ -0,0 +1,22 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package lambda;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Lambda {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        practice_1 obj1 =(int a)->{System.out.println(2*a);}; 
+        obj1.abstractfunction(25);
+        obj1.normalfunction();
+    }
+    
+}
diff --git a/Parth_Kharva/Lambda/class1.java b/Parth_Kharva/Lambda/class1.java
new file mode 100644
index 0000000..1e9ef86
--- /dev/null
+++ b/Parth_Kharva/Lambda/class1.java
@@ -0,0 +1,16 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Interface.java to edit this template
+ */
+package lambda;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public interface practice_1 {
+    void abstractfunction(int a);
+    default void normalfunction(){
+        System.out.println("Hello ji");
+    }
+}
diff --git a/Parth_Kharva/Method_OverLoading.java b/Parth_Kharva/Method_OverLoading.java
new file mode 100644
index 0000000..3e8be6e
--- /dev/null
+++ b/Parth_Kharva/Method_OverLoading.java
@@ -0,0 +1,36 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package method_over_loading;
+
+/**
+ *
+ * @author Parthkharva
+ */
+class math{
+    void sum(int i,int j){
+        int add = i+j;
+        System.out.println("Sum of two value is :"+add);
+    }
+    void sum(int i,int j,int k){
+    int add = i+j+k;
+        System.out.println("Sum of three value is :"+add);
+    }
+    void sum(int i,int j,int k,int l){
+    int add = i+j+k+l;
+        System.out.println("Sum of four value is :"+add);
+    }
+}
+public class Method_over_loading {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        math obj =new math();
+        obj.sum(45, 78);
+        obj.sum(45, 91, 12);
+        obj.sum(82, 1, 0, 99);
+    }
+}
diff --git a/Parth_Kharva/Method_Over_Riding.java b/Parth_Kharva/Method_Over_Riding.java
new file mode 100644
index 0000000..b045042
--- /dev/null
+++ b/Parth_Kharva/Method_Over_Riding.java
@@ -0,0 +1,69 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package method_overriding;
+
+/**
+ *
+ * @author Parthkharva
+ */
+class employee {
+
+    String name;
+    int age;
+    double salary;
+
+    void printdata() {
+        System.out.println("Name : " + name + "\nAge : " + age + "\nSalary : " + salary);
+    }
+}
+
+class emp1 extends employee {
+
+    String language;
+
+    @Override
+    void printdata() {
+        super.printdata();
+        System.out.println("Language : "+language);
+    }
+}
+
+class emp2 extends emp1{
+    String database_tool;
+    void printdata(){
+        super.printdata();
+        System.out.println("Database tool : "+ database_tool);
+    }
+}
+
+public class Method_overriding {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        employee obj1 = new employee();
+        obj1.name = "Ashish";
+        obj1.age = 24;
+        obj1.salary = 19607.67;
+        obj1.printdata();
+        
+        emp1 obj2 = new emp1();
+        obj2.name = "khyati";
+        obj2.age = 21;
+        obj2.salary = 12987.276;
+        obj2.language = "Java";
+        obj2.printdata();
+        
+        emp2 obj3 = new emp2();
+        obj3.name = "Parth";
+        obj3.age = 20;
+        obj3.salary = 14928.78;
+        obj3.language = "Java";
+        obj3.database_tool = "MySQL";
+        obj3.printdata();
+    }
+
+}
diff --git a/Parth_Kharva/Nested Conditions.java b/Parth_Kharva/Nested Conditions.java
new file mode 100644
index 0000000..8448af0
--- /dev/null
+++ b/Parth_Kharva/Nested Conditions.java	
@@ -0,0 +1,29 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package nested._condition;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Nested_condition {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        String name= "parth",surname="kharva";
+        if(name == "parth"){
+            if(surname == "jain"){
+                System.out.println("your student record is available.");
+            }
+            else{
+                System.out.println("your student "+name+" "+surname+"'s record is not available.");
+            }
+        }
+        
+    }
+    
+}
diff --git a/Parth_Kharva/Polymorphism/Interface.java b/Parth_Kharva/Polymorphism/Interface.java
new file mode 100644
index 0000000..ff99678
--- /dev/null
+++ b/Parth_Kharva/Polymorphism/Interface.java
@@ -0,0 +1,13 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Interface.java to edit this template
+ */
+package polymorphism;
+
+/**
+ *
+ * @author Parthkharva
+ */
+ interface bank {
+    float rate_of_interest();
+}
diff --git a/Parth_Kharva/Polymorphism/class1.java b/Parth_Kharva/Polymorphism/class1.java
new file mode 100644
index 0000000..6f62a94
--- /dev/null
+++ b/Parth_Kharva/Polymorphism/class1.java
@@ -0,0 +1,25 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package polymorphism;
+
+import javax.annotation.processing.SupportedSourceVersion;
+import javax.lang.model.SourceVersion;
+
+/**
+ *
+ * @author Parthkharva
+ */
+
+ class pnb implements bank {
+
+    /**
+     *
+     * @return
+     */
+    @Override
+    public float rate_of_interest(){
+        return 956.8f;
+    } 
+}
diff --git a/Parth_Kharva/Polymorphism/class2.java b/Parth_Kharva/Polymorphism/class2.java
new file mode 100644
index 0000000..42de96a
--- /dev/null
+++ b/Parth_Kharva/Polymorphism/class2.java
@@ -0,0 +1,15 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package polymorphism;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class sbi implements bank {
+    public float rate_of_interest(){
+        return 458.42f;
+    }
+}
diff --git a/Parth_Kharva/Polymorphism/main constructer class.java b/Parth_Kharva/Polymorphism/main constructer class.java
new file mode 100644
index 0000000..7606f59
--- /dev/null
+++ b/Parth_Kharva/Polymorphism/main constructer class.java	
@@ -0,0 +1,25 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package polymorphism;
+
+/**
+ *
+ * @author Parthkharva
+ */
+
+public class Polymorphism {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        bank obj1 = new pnb();
+        bank obj2 = new sbi();
+        
+        System.out.println("ROI :"+obj1.rate_of_interest());
+        System.out.println("ROI :"+obj2.rate_of_interest());
+    }
+    
+}
diff --git a/Parth_Kharva/Read input with 1D Array.java b/Parth_Kharva/Read input with 1D Array.java
new file mode 100644
index 0000000..b21e740
--- /dev/null
+++ b/Parth_Kharva/Read input with 1D Array.java	
@@ -0,0 +1,46 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package read_input_with_array;
+
+import java.util.Scanner;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Read_input_with_array {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter the your required array size:");
+        int size = sc.nextInt();
+
+        //string
+        String[] array = new String[size];
+        System.out.println("Enter String elements of the array : ");
+        for (int i = 0; i < size; i++) {
+            array[i] = sc.next();
+        }
+        System.out.println("Your stored array elements are ");
+        for (int j = 0; j < size; j++) {
+            System.out.println(array[j]);
+        }
+
+        //int
+        int[] arrays = new int[size];
+        System.out.println("Enter integer elements of the array : ");
+        for (int i = 0; i < size; i++) {
+            arrays[i] = sc.nextInt();
+        }
+        System.out.println("Your stored array elements are ");
+        for (int j = 0; j < size; j++) {
+            System.out.println(arrays[j]);
+        }
+    }
+
+}
diff --git a/Parth_Kharva/Read_Input with 2d array.java b/Parth_Kharva/Read_Input with 2d array.java
new file mode 100644
index 0000000..f7ee088
--- /dev/null
+++ b/Parth_Kharva/Read_Input with 2d array.java	
@@ -0,0 +1,43 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package read_input_with_2d_array;
+
+import java.util.Scanner;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Read_input_with_2D_array {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        Scanner sc = new Scanner(System.in);
+        System.out.println("Enter the your required 2D array Row no:");
+        int row = sc.nextInt();
+        System.out.println("Enter the your required 2D array column no:");
+        int column = sc.nextInt();
+
+        int[][] array = new int[row][column];
+
+        System.out.println("Enter integer elements of the array : ");
+        for (int i = 0; i < row; i++) {
+            for (int j = 0; j < column; j++) {
+                array[i][j] = sc.nextInt();
+            }
+        }
+
+        System.out.println("Your stored array elements are ");
+        for (int i = 0; i < row; i++) {
+            for (int j = 0; j < column; j++) {
+                System.out.print(array[i][j]+"  ");
+            }
+            System.out.println("\n");
+        }
+    }
+
+}
diff --git a/Parth_Kharva/RestFull Web Service/Postman_Result.png b/Parth_Kharva/RestFull Web Service/Postman_Result.png
new file mode 100644
index 0000000..85e4cfe
Binary files /dev/null and b/Parth_Kharva/RestFull Web Service/Postman_Result.png differ
diff --git a/Parth_Kharva/RestFull Web Service/Simple_controller.java b/Parth_Kharva/RestFull Web Service/Simple_controller.java
new file mode 100644
index 0000000..9ccc1d4
--- /dev/null
+++ b/Parth_Kharva/RestFull Web Service/Simple_controller.java	
@@ -0,0 +1,12 @@
+package com.java.springboot.test.springbootproject;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+@RestController
+public class simple_controller{
+	
+	@RequestMapping("/hello")
+	public webservice test(){
+		return new webservice("Parth Kharva","Navrachana University","BCA","JAVA Intern At Hackveda");
+	}
+}
diff --git a/Parth_Kharva/RestFull Web Service/SpringbootApplication.java b/Parth_Kharva/RestFull Web Service/SpringbootApplication.java
new file mode 100644
index 0000000..bfb264c
--- /dev/null
+++ b/Parth_Kharva/RestFull Web Service/SpringbootApplication.java	
@@ -0,0 +1,16 @@
+package com.java.springboot.test.springbootproject;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.context.annotation.ComponentScan;
+
+@SpringBootApplication
+@ComponentScan
+public class SpringbootprojectApplication{
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringbootprojectApplication.class, args);
+		
+	}
+
+}
diff --git a/Parth_Kharva/RestFull Web Service/web_result.png b/Parth_Kharva/RestFull Web Service/web_result.png
new file mode 100644
index 0000000..bfd6c6f
Binary files /dev/null and b/Parth_Kharva/RestFull Web Service/web_result.png differ
diff --git a/Parth_Kharva/RestFull Web Service/webservice.java b/Parth_Kharva/RestFull Web Service/webservice.java
new file mode 100644
index 0000000..d4cd969
--- /dev/null
+++ b/Parth_Kharva/RestFull Web Service/webservice.java	
@@ -0,0 +1,50 @@
+package com.java.springboot.test.springbootproject;
+
+public class webservice {
+
+	private String  name;
+	private String  university;
+	private String  Stream;
+	private String  curren_stateus;
+	
+	public webservice(String name, String University,String Stream,String current_Stateus)
+	{
+		super();
+		this.name = name;
+		this.university = University;
+		this.Stream = Stream;
+		this.curren_stateus = current_Stateus;
+	}
+	
+	public String getName() {
+		return name;
+	}
+	public void setName(String name) {
+		this.name = name;
+	}
+	
+	public String getUniversity() {
+		return university;
+	}
+
+	public void setUniversity(String university) {
+		this.university = university;
+	}
+
+	public String getStream() {
+		return Stream;
+	}
+
+	public void setStream(String stream) {
+		Stream = stream;
+	}
+
+	public String getCurren_stateus() {
+		return curren_stateus;
+	}
+
+	public void setCurren_stateus(String curren_stateus) {
+		this.curren_stateus = curren_stateus;
+	}
+
+}
diff --git a/Parth_Kharva/Spring Framework/main_file.java b/Parth_Kharva/Spring Framework/main_file.java
new file mode 100644
index 0000000..6b5947f
--- /dev/null
+++ b/Parth_Kharva/Spring Framework/main_file.java	
@@ -0,0 +1,24 @@
+package com.spring_framwork.spring_framwork;
+
+import java.security.PublicKey;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+@SpringBootApplication
+@RestController
+public class SpringFramworkApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringFramworkApplication.class, args);
+	}
+	
+	@GetMapping("/hello")
+	public String sayhello(@RequestParam(value = "myname", defaultValue = "World")String name) {
+		return String.format("Hello %s!", name);
+	}
+
+}
diff --git a/Parth_Kharva/Spring Framework/output with passing parameters.png b/Parth_Kharva/Spring Framework/output with passing parameters.png
new file mode 100644
index 0000000..70404a5
Binary files /dev/null and b/Parth_Kharva/Spring Framework/output with passing parameters.png differ
diff --git a/Parth_Kharva/Spring Framework/without passing parameters.png b/Parth_Kharva/Spring Framework/without passing parameters.png
new file mode 100644
index 0000000..9d5690b
Binary files /dev/null and b/Parth_Kharva/Spring Framework/without passing parameters.png differ
diff --git a/Parth_Kharva/Spring boot/SpringbootApplication.java b/Parth_Kharva/Spring boot/SpringbootApplication.java
new file mode 100644
index 0000000..67c0432
--- /dev/null
+++ b/Parth_Kharva/Spring boot/SpringbootApplication.java	
@@ -0,0 +1,14 @@
+package com.java.springboot.test.springbootproject;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringbootprojectApplication extends simple_controller{
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringbootprojectApplication.class, args);
+		
+	}
+
+}
diff --git a/Parth_Kharva/Spring boot/simpe_app_controller.java b/Parth_Kharva/Spring boot/simpe_app_controller.java
new file mode 100644
index 0000000..5b1a905
--- /dev/null
+++ b/Parth_Kharva/Spring boot/simpe_app_controller.java	
@@ -0,0 +1,10 @@
+package com.java.springboot.test.springbootproject;
+
+import org.springframework.web.bind.annotation.RequestMapping;
+
+public class simple_controller {
+	@RequestMapping("/hi")
+	public String test() {
+		return "Spring boot application using spring initiaizer created by Parth Kharva. ";
+	}
+}
diff --git a/Parth_Kharva/Spring_Security/Output.pdf b/Parth_Kharva/Spring_Security/Output.pdf
new file mode 100644
index 0000000..f983e2c
Binary files /dev/null and b/Parth_Kharva/Spring_Security/Output.pdf differ
diff --git a/Parth_Kharva/Spring_Security/Security_config.java b/Parth_Kharva/Spring_Security/Security_config.java
new file mode 100644
index 0000000..6b2c7bf
--- /dev/null
+++ b/Parth_Kharva/Spring_Security/Security_config.java
@@ -0,0 +1,52 @@
+package com.spring.security.test.spring_security_test;
+
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+import org.springframework.security.config.annotation.web.builders.HttpSecurity;
+import org.springframework.security.core.userdetails.User;
+import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UserDetailsService;
+import org.springframework.security.crypto.bcrypt.BCryptPasswordEncoder;
+import org.springframework.security.crypto.password.PasswordEncoder;
+import org.springframework.security.provisioning.InMemoryUserDetailsManager;
+import org.springframework.security.web.SecurityFilterChain;
+
+@Configuration
+public class Security_config {
+	@Bean
+	public PasswordEncoder passwordEncoder() {
+		return new BCryptPasswordEncoder();
+	}
+	
+	@Bean
+	public UserDetailsService userDetailsService(){
+		UserDetails normalUser = User.withUsername("Parth")
+				.password(passwordEncoder().encode("ParTh"))
+				.roles("NORMAL")
+				.build();
+		UserDetails adminUser = User.withUsername("Parth125")
+				.password(passwordEncoder().encode("ParTh"))
+				.roles("ADMIN")
+				.build();
+		return new InMemoryUserDetailsManager(normalUser,adminUser) ;
+	}
+	
+	
+	@Bean
+	public SecurityFilterChain filterchain(HttpSecurity httpsecurity) throws Exception {
+		httpsecurity.csrf().disable()
+		.authorizeHttpRequests()
+		.requestMatchers("/home/admin")
+		.hasRole("ADMIN")
+		.requestMatchers("/home/normal")
+		.hasRole("NORMAL")
+		.requestMatchers("/home/public")
+		.permitAll()
+		.anyRequest()
+		.authenticated()
+		.and()
+		.formLogin();
+		return httpsecurity.build();
+	}
+}
+
diff --git a/Parth_Kharva/Spring_Security/Simple_Controller.java b/Parth_Kharva/Spring_Security/Simple_Controller.java
new file mode 100644
index 0000000..7f2c1ea
--- /dev/null
+++ b/Parth_Kharva/Spring_Security/Simple_Controller.java
@@ -0,0 +1,25 @@
+package com.spring.security.test.spring_security_test;
+
+import org.springframework.http.ResponseEntity;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+@RestController
+@RequestMapping("/home")
+public class Simple_Controller {
+	@GetMapping("/normal")
+	public ResponseEntity<String> normalUser(){
+		return ResponseEntity.ok("Yes, I  am normal User");
+	}
+	
+	@GetMapping("/admin")
+	public ResponseEntity<String> adminUser(){
+		return ResponseEntity.ok("Yes, I  am admin User");
+	}
+	
+	@GetMapping("/public")
+	public ResponseEntity<String> publicUser(){
+		return ResponseEntity.ok("Yes, I  am pulic User");
+	}
+}
diff --git a/Parth_Kharva/Spring_Security/SpringSecurityTestApplication.java b/Parth_Kharva/Spring_Security/SpringSecurityTestApplication.java
new file mode 100644
index 0000000..3c99e0f
--- /dev/null
+++ b/Parth_Kharva/Spring_Security/SpringSecurityTestApplication.java
@@ -0,0 +1,13 @@
+package com.spring.security.test.spring_security_test;
+
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+
+@SpringBootApplication
+public class SpringSecurityTestApplication {
+
+	public static void main(String[] args) {
+		SpringApplication.run(SpringSecurityTestApplication.class, args);
+	}
+
+}
diff --git a/Parth_Kharva/String operations b/Parth_Kharva/String operations
new file mode 100644
index 0000000..79776f8
--- /dev/null
+++ b/Parth_Kharva/String operations	
@@ -0,0 +1,38 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package string_operations;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class String_operations {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        char x= 'f';
+        String name1 = "aNuRaG";
+        String name2 = "parth";
+        
+        System.out.println(name1.length());
+        System.out.println(name2.charAt(2));// start counting position at 0
+        System.out.println(name1.compareTo(name2));//it will compare two strings and givesome asscci value.
+        System.out.println(name2.strip());// it will remove spaceing(before staring space and after ending space).
+        
+        char[] character = name1.toCharArray();// it will convert string value to character value
+        
+        for(int i=0;i<name1.length();i++){
+           System.out.println(character[i]);
+        }
+        
+        System.out.println(name1.toLowerCase());// it will convert upper to lower case
+        System.out.println(name2.toUpperCase());// it will convert lower to upper case
+        System.out.println(name2.substring(1,4));// it will give you the your requested part in this string value.
+        System.out.println(name2.substring(2));// it will start print in your requested place is consider as bigenning.
+        System.out.println(name2.isBlank());// it will give only true/false value according to has value or not.
+    } 
+}
diff --git a/Parth_Kharva/User function (member function).java b/Parth_Kharva/User function (member function).java
new file mode 100644
index 0000000..7183386
--- /dev/null
+++ b/Parth_Kharva/User function (member function).java	
@@ -0,0 +1,35 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package user_function.memberfunction;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class User_functionMemberfunction {
+
+    /**
+     * @param args the command line arguments
+     */
+    
+    String name;
+    int roll_no;
+    int age;
+    String university_name;
+    float cgpa;
+    
+    public void student_info(){
+    System.out.println("Name : "+name+" \nRoll No : "+roll_no+" \nAge : "+age+" \nUniversity Name : "+university_name+" \nCGPA OF LAST SEM : "+cgpa);
+    }
+    public static void main(String[] args) {
+        User_functionMemberfunction uf = new User_functionMemberfunction();
+        uf.name = "Parth Kharva";
+        uf.roll_no = 15;
+        uf.age = 20;
+        uf.university_name = "Navrachana University";
+        uf.cgpa = 8.64f;
+        uf.student_info();
+    }
+}
diff --git a/Parth_Kharva/abstract/Mainjava.java b/Parth_Kharva/abstract/Mainjava.java
new file mode 100644
index 0000000..2e845c6
--- /dev/null
+++ b/Parth_Kharva/abstract/Mainjava.java
@@ -0,0 +1,25 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package abstract_method;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Abstract_method extends abstract_class{
+
+    /**
+     * @param args the command line arguments
+     */
+    public void method2(){
+        System.out.println("hello ji");
+    }
+    public static void main(String[] args) {
+        abstract_class ab = new Abstract_method();
+        ab.method2();
+        ab.method1();
+    }
+    
+}
diff --git a/Parth_Kharva/abstract/abstract_class.java b/Parth_Kharva/abstract/abstract_class.java
new file mode 100644
index 0000000..fe054ab
--- /dev/null
+++ b/Parth_Kharva/abstract/abstract_class.java
@@ -0,0 +1,16 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Class.java to edit this template
+ */
+package abstract_method;
+
+/**
+ *
+ * @author Parthkharva
+ */
+abstract class abstract_class {
+    public void method1(){
+        System.out.println("hi");
+    }
+    abstract public void method2();
+}
diff --git a/Parth_Kharva/conditions.java b/Parth_Kharva/conditions.java
new file mode 100644
index 0000000..f0fc365
--- /dev/null
+++ b/Parth_Kharva/conditions.java
@@ -0,0 +1,32 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package conditions;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Conditions {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        int i = 90;
+        if(i>80 && i<=100){
+            System.out.println("Your selected number is in the range of 81 to 100");
+        }
+        else if(i>40 && i<=80){
+            System.out.println("Your selected number is in the range of 41 to 80");
+        }
+        if(i>0 && i<=40){
+            System.out.println("Your selected number is in the range of 1 to 40");
+        }
+        else if(i>100){
+            System.out.println("Your selected number is above 100 ");
+        }
+    }
+    
+}
diff --git a/Parth_Kharva/data type and operaters b/Parth_Kharva/data type and operaters
new file mode 100644
index 0000000..9e0867b
--- /dev/null
+++ b/Parth_Kharva/data type and operaters	
@@ -0,0 +1,59 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package javaapplication1;
+
+import static jdk.nashorn.api.scripting.ScriptUtils.convert;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class JavaApplication1 {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        int a = 10;
+        int b = 52;
+        float x= 123.4556655f;
+        System.out.println(x);
+        
+        double dd = 456/45;
+        System.out.println(dd);
+        
+        String c = "parth";
+        String name = null;
+        System.out.println("name:"+c+" : "+name);
+        
+        int d =++b;
+        System.out.println(d);
+        
+        int e =b++;
+        System.out.println(e);
+        
+        int f = a--;
+        System.out.println(f);
+        
+        int g = --a;
+        System.out.println(g);
+        
+        int h = a+b;
+        System.out.println(h);
+        
+        int i = a-b;
+        System.out.println(f);
+        
+        int j = a*b;
+        System.out.println(j);
+        
+        int k = a/b;
+        System.out.println(k);
+        
+        boolean bl = true;
+        System.out.println(bl);
+        System.out.println(!bl);
+    } 
+}
diff --git a/Parth_Kharva/do_while loop.java b/Parth_Kharva/do_while loop.java
new file mode 100644
index 0000000..7fae7e5
--- /dev/null
+++ b/Parth_Kharva/do_while loop.java	
@@ -0,0 +1,25 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package do_while;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class Do_while {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        int i = 1;
+        do{
+            System.out.println(i);
+            i++;
+        }
+        while(i<=10);
+    }
+    
+}
diff --git a/Parth_Kharva/for_loop.java b/Parth_Kharva/for_loop.java
new file mode 100644
index 0000000..8267c7d
--- /dev/null
+++ b/Parth_Kharva/for_loop.java
@@ -0,0 +1,26 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package for_loop;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class For_loop {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        
+        for(int i= 1;i<=5;i++){
+            for(int j= 1;j<=10;j++){
+                System.out.println("value of i:"+i+"value of j:"+j+".");
+            }
+            System.out.print("\n");
+        }
+    }
+    
+}
diff --git a/Parth_Kharva/jshell.java b/Parth_Kharva/jshell.java
new file mode 100644
index 0000000..46de38b
--- /dev/null
+++ b/Parth_Kharva/jshell.java
@@ -0,0 +1,65 @@
+|  Welcome to JShell -- Version 11.0.10
+|  For an introduction type: /help intro
+
+jshell> String print(String a){return a+a;}
+|  created method print(String)
+
+jshell> print("Parth")
+$2 ==> "ParthParth"
+
+jshell> int sum(int x, int y){return x*y;}
+|  created method sum(int,int)
+
+jshell> sum(45,21)
+$4 ==> 945
+
+jshell> double volume(double radius){ return 4.0/7.6 * 3.14 * 89*45*2 * radius;}
+|  created method volume(double)
+
+jshell> volume(8);
+$6 ==> 105900.63157894736
+
+jshell> /vars
+|    String $2 = "ParthParth"
+|    int $4 = 945
+|    double $6 = 105900.63157894736
+
+jshell> /methods
+|    String print(String)
+|    int sum(int,int)
+|    double volume(double)
+
+jshell> /list
+
+   1 : String print(String a){return a+a;}
+   2 : print("Parth")
+   3 : int sum(int x, int y){return x*y;}
+   4 : sum(45,21)
+   5 : double volume(double radius){ return 4.0/7.6 * 3.14 * 89*45*2 * radius;}
+   6 : volume(8);
+
+jshell> /list -all
+
+  s1 : import java.io.*;
+  s2 : import java.math.*;
+  s3 : import java.net.*;
+  s4 : import java.nio.file.*;
+  s5 : import java.util.*;
+  s6 : import java.util.concurrent.*;
+  s7 : import java.util.function.*;
+  s8 : import java.util.prefs.*;
+  s9 : import java.util.regex.*;
+ s10 : import java.util.stream.*;
+   1 : String print(String a){return a+a;}
+   2 : print("Parth")
+   3 : int sum(int x, int y){return x*y;}
+   4 : sum(45,21)
+   5 : double volume(double radius){ return 4.0/7.6 * 3.14 * 89*45*2 * radius;}
+   6 : volume(8);
+
+jshell> int x = 78;
+x ==> 78
+        jshell>
+jshell>
+jshell> String x
+x ==> null
diff --git a/Parth_Kharva/while loop.java b/Parth_Kharva/while loop.java
new file mode 100644
index 0000000..95c0f8f
--- /dev/null
+++ b/Parth_Kharva/while loop.java	
@@ -0,0 +1,29 @@
+/*
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Licenses/license-default.txt to change this license
+ * Click nbfs://nbhost/SystemFileSystem/Templates/Classes/Main.java to edit this template
+ */
+package while_loop;
+
+/**
+ *
+ * @author Parthkharva
+ */
+public class While_loop {
+
+    /**
+     * @param args the command line arguments
+     */
+    public static void main(String[] args) {
+        int i=1, j=1;
+        while(i<=10){
+            while(j<=9){
+                System.out.println(j);
+                j++;
+            }
+            i++;
+            j=1;
+            System.out.print("\n");
+        }
+    }
+    
+}