Java user Defined Exception Handling - Hello Exception

/*

Write a java program for exception handling:

To create a user defined exception whenever user input the word "hello".

*/

// java Exception Handling

// user defined exception

import java.util.*;

class userdefinedexception extends Exception

{

     public String toString()

     {

          return ("Hello Exception");

     }

}

class UsrDefException

{

     public static void main(String args[])

     {

          String str;

          Scanner s = new Scanner(System.in);

          try

          {

              System.out.print("Enter name : ");

              str = s.next().trim();

             

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

              if(str.equalsIgnoreCase("HELLO"))

              {

                   throw new userdefinedexception();

              }

              else

                   System.out.print("Hello "+str);

          }

          catch(userdefinedexception e)

          {

              System.out.println(e) ;

          }

     }

}

/*

Sample output

D:\oopjava>javac UsrDefException.java

D:\oopjava>java UsrDefException

Enter name : asdf

Hello asdf

D:\oopjava>java UsrDefException

Enter name : hello

Hello Exception

D:\oopjava>

*/