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    User defined exception in java

    User Defined Exception or custom exception is creating user own exception class and throws that exception using ‘throw’ keyword. User-defined exception must extend Exception class.

    In order to create custom exception, it is needed to extend Exception class that belongs to java.lang package.

     

    Ex:

    class JavaException{

       public static void main(String args[]){

      try{

           throw new MyException(2);

           // throw is used to create a new exception and throw it.

      }

     catch(MyException e){

        System.out.println(e) ;

     }

    }

    }

    class MyException extends Exception{

       int a;

       MyException(int b) {

         a=b;

       }

       public String toString(){

         return ("Exception Number =  "+a) ;

      }

    }

     

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