User Define Exceptions Handling

Author: DhirajGadekar

Exception-Handling/5_ExceptionHandling.java

@@ -0,0 +1,20 @@
+import java.io.*;
+
+class ExceptionHandling {
+	
+	public static void main(String[] args)throws IOException {
+
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+		System.out.println("Enter Integer Value : ");
+		int data = 0;
+		try {
+
+			data = Integer.parseInt(br.readLine());
+		} catch(NumberFormatException obj) {
+			
+			System.out.println("Please Enter Integer Data");
+		}
+		System.out.println(data);
+	}
+}

Exception-Handling/6_PrintException.java

@@ -0,0 +1,21 @@
+import java.util.*;
+
+class PrintException {
+	
+	public static void main(String[] args) {
+		
+		Scanner sc = new Scanner(System.in);
+
+		System.out.println("Enter Integer Value : ");
+		int num = 0;
+
+		try {
+			
+			num = sc.nextInt();
+		} catch(InputMismatchException obj) {
+			
+			System.out.print("Exception in Thread " + "\"" +Thread.currentThread().getName() + "\"" + " ");
+			obj.printStackTrace();
+		}
+	}
+}	

Exception-Handling/7_MultipleException.java

@@ -0,0 +1,21 @@
+import java.util.*;
+
+class MultipleException {
+
+	public static void main(String[] args) {
+
+		Scanner sc= new Scanner(System.in);
+
+		System.out.println("Enter Integer Value : ");
+		int num = 0;
+
+		try {
+			
+			num = sc.nextInt();
+			System.out.println(10/num);
+		} catch(InputMismatchException | ArithmeticException obj) {
+			
+			System.out.println("Exception Handled");
+		}
+	}
+}

Exception-Handling/8_UserDefineException.java

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+import java.io.*;
+
+class DataUnderFlowException extends RuntimeException{
+	
+	DataUnderFlowException(String msg) {
+		
+		super(msg);
+	}
+}
+
+class DataOverFlowException extends RuntimeException{
+	
+	DataOverFlowException(String msg) {
+		
+		super(msg);
+	}
+}
+
+class Main {
+
+	public static void main(String[] args) throws IOException {
+		
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+
+		int arr[] = new int[5];
+
+		System.out.println("Enter Integer value in Array : ");
+		System.out.println("Note: 0 < element < 100");
+		for(int i = 0; i < arr.length; i++) {
+			
+			int data = 0;
+			try {
+
+				data = Integer.parseInt(br.readLine());
+			} catch(NumberFormatException nfe) {
+				
+				System.out.println("Enter Integer Value : ");
+				data = Integer.parseInt(br.readLine());
+			}
+
+			if(data < 0) {
+				
+				try {
+
+					throw new DataUnderFlowException("Data is less than 0");
+				} catch(DataUnderFlowException duf) {
+					
+					System.out.println(duf.getMessage());
+					i--;
+				}
+			}
+			if(data > 100) {
+				
+				try {
+
+					throw new DataOverFlowException("Data is greater than 100");
+				} catch(DataOverFlowException duf) {
+					
+					System.out.println(duf.getMessage());
+					i--;
+				}
+			}
+			arr[i] = data;
+		}
+		
+		System.out.println("Array Elements : ");
+
+		for(int i = 0; i < arr.length; i++) {
+
+			System.out.print(arr[i] +" ");
+		}
+		System.out.println();
+	}
+}

Exception-Handling/9_ExceptionRealTimeEx.java

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+import java.io.*;
+
+class InvalidCredentialsException extends RuntimeException{
+	
+	InvalidCredentialsException(String msg) {
+		
+		super(msg);
+	}
+}
+
+class Main {
+	
+	static String userName1 = "dhirajgadekar";
+	static String password1 = "dhiraj@123";
+
+	public static void main(String[] args) throws IOException {
+		
+		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
+		
+		System.out.print("Enter UserName : ");
+		String userName2 = br.readLine();
+
+		System.out.print("Enter Password : ");
+		String password2 = br.readLine();
+	
+
+		boolean flag = true;
+
+		while(flag) {
+			if(!(userName1.equals(userName2) && password1.equals(password2))) {
+			
+				try {
+				
+					throw new InvalidCredentialsException("Invalid username or password");
+				} catch(InvalidCredentialsException ivc) {
+					
+					System.out.println(ivc.getMessage());
+					System.out.print("Enter UserName : ");
+					userName2 = br.readLine();
+
+					System.out.print("Enter Password : ");
+					password2 = br.readLine();
+				}
+			} else {
+				
+				System.out.println("Login Successful");
+				flag = false;
+			}
+		}
+	}
+}