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Java Exception class


We can write our custom Exceptions using the Exception class in java.
public class MyException extends Exception {
       // Overridden methods
}

The Exception class has the following important methods:

1) Strings toString() executed when sout (e) is ran
2) Void printStackTrace() - prints Stack trace
3) String getMessage() - prints the exception message

Example



package com.company;

import java.util.Scanner;

class MyException extends Exception{
    @Override
    public String toString() {
        return "I am toString()";
    }

    @Override
    public String getMessage() {
        return "I am getMessage()";
    }
}
class MaxAgeException extends Exception{
    @Override
    public String toString() {
        return "Age cannot be greater than 125";
    }

    @Override
    public String getMessage() {
        return "Make sure that the value of age entered is correct";
    }
}
public class exception_class {
    public static void main(String[] args) {
        int a;
        Scanner sc = new Scanner(System.in);
        a = sc.nextInt();
        if (a<9){
            try{
                // throw new MyException();
                throw new ArithmeticException("This is an exception");
            }
            catch (Exception e){
                System.out.println(e.getMessage());
                System.out.println(e.toString());
                e.printStackTrace();
                System.out.println("Finished");
            }
            System.out.println("Yes Finished");
        }
    }
}


Conclusion

In this page (written and validated by ) you learned about Java Exception class . What's Next? If you are interested in completing Java tutorial, your next topic will be learning about: Java Throw vs Throws.



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