code implementation by Parth Kharva

JavaApplication1.java

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+/*
+ * 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);
+    } 
+}

Parth_Kharva/1D_Array_implementation.java

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+/*
+ * 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);
+    }
+}

Parth_Kharva/2D_Array_Implementation.java

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+/*
+ * 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");
+        }
+
+    }
+}

Parth_Kharva/Access Specifier/Class1.java

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+/*
+ * 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;
+}

Parth_Kharva/Access Specifier/Main class.java

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+/*
+ * 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);
+
+    }
+
+}

Parth_Kharva/DRDO Cryptography and Cryptanalysis Project/Implement Caesar Cipher in Java/Encryption_&_Decryption_Portion_Of _Caesar_Cipher.java

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+/*
+ * 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...");
+    }
+}