Programmers can define their own Exceptions by extending the Exception class or one of the descendants of the Exception class.

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Java predefines a number of Exception classes so that many of the types of Exceptions that can cause a program to terminate are handled. However, Java allows programmers to add to the language by defining their own Exceptions for whatever unique situations they might encounter. These new Exceptions will either be children of the Exception class, or children of subclasses or descendants of Exception.

Programmers Can Define Their Own Exceptions by Extending the Exception