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How to Create User Defined Exception in Java

Core Java » On Sep 28, 2012 By Sivateja

Apart from existing Exceptions in java, we can create our own Exceptions (User defined exceptions in java), we will how to..

Required files

  • Client.java [ My business logic will goes here ]
  • MyOwnExceptionClass.java  [ This is our own Exception class ]

Note: Our user defined class must extend from Exception class, and we must override the toString() method to display our exception message.

Client.java

MyOwnExceptionClass.java

Output:








By ( Java/J2EE Developer & Web Designer )
Founder of Java4s.com. You can contact me at sivateja [at] java4s.com


Comments

9 Responses to “How to Create User Defined Exception in Java”
  1. suresh says:

    Hi,
    Can’t we like this, instead of overriding toString() method. can’t we call super(msg) in constructor.

    Thanks,
    Suresh.p

  2. Java4s says:

    @Suresh

    Yeah you can do..
    Changes:

    In Client.java – Line number 9, Write some description about your Exception.
    In MyOwnExceptionClass.java – Fetch the previous message through constructor and at Line number 8 write super(msg).

    Note: Ensure super(–) must be the first statement in the constructor always :-)

    That’s it.

  3. u.balu99 says:

    thank u sir………..

  4. Hari says:

    what is the boilerplate issue in Hibernate ?how to avoid it?

  5. sonu kumar says:

    What is the difference between String, StringTokenizer and StringBuffer. complete explanation with an appropriate example..
    please make me aware as soon as possible with good clarity.

  6. what is the difference b/t user defined exception & default exception…

  7. srinivas says:

    what is the differences between ‘throws’ and ‘throw’?

  8. this very good explanation

  9. Blessed by S&M says:

    Difference between throws and throw:

    throws keyword is used to give a list of probable Exception classes which will handle the exception whereas throw keyword is used to specify a particular exception class.

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