How to use User Defined Exception

[Bhavesh Sangwan]

my method which raising an exception and I want to catch this exception using my own class... method is...

public void div() throws MyException{
		/*if(this.b==0){
			throw new MyException("Zero not allowed here...!");
			}*/
		try{
		c = a/b;
		}catch(MyException e){
		System.out.println(e);
		}
		
		System.out.println("It will print");
		System.out.println("Division : "+c);
	}

And my user defined exceptions class is...

public class MyException extends ArithmeticException{

	public MyException(){
		super("My Exception occured...!");
		}
	
	public MyException(String msg){
		super(msg);
	}
	public String toString(){
		return "Exception caught by MyException Class...!";
	}
}

And calling method is...

public static void main(String[] as){
		Scanner sc = new Scanner(System.in);
		System.out.println("Enter two integers : ");
		int a = sc.nextInt();
		int b = sc.nextInt();
		ExTest test = new ExTest(a,b);
		test.div();
		
		
	}

Please guide me HOW to use that MyException class ...

[Winston Gutkowski]

Bhavesh Sangwan wrote:my method which raising an exception

No it isn't, because you've already caught it.

and I want to catch this exception using my own class... method is...

Then don't use try...catch (at least, not like that). You've commented out the code that actually throws your exception, so if you run it with a divisor of 0, you'll get an ArithmeticException.

Winston

[vinay chaturvedi]

You have to define the div method as below :

public void div(){  
    	if(b==0){ 
            throw new MyException("Zero not allowed here...!"); 
    	}
        c = a/b;  
                 
        System.out.println("It will print");  
        System.out.println("Division : "+c);  
    }

User defined Exception is always thrown using "throw" keyword.

[Campbell Ritchie]

Have you been through the Java Tutorials?

[Bhavesh Sangwan]

Thanks Vinay! Your information is very helpful for me..... The key point was throw keyword...as I was trying to catch the exception using userdefined class.....