Java - exception Handling - user defined exception handling

// user defined exception

class userdefinedexception extends Exception

{

     int a;

    

     userdefinedexception(int b)

     {

          a = b;

     }

    

     public String toString()

     {

          return ("Exception Number =  "+a) ;

     }

}

class JavaException

{

     public static void main(String args[])

     {

          try

          {

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

              throw new userdefinedexception(2);

      

          }

          catch(userdefinedexception e)

          {

              System.out.println(e) ;

          }

     }

}