Java Tutorial : Exceptions in Java

An exception is a problem that arises during the execution of a program. An exception can occur for many different reasons, including the following:

1. A user has entered invalid data.
2. A file that needs to be opened cannot be found.
3. A network connection has been lost in the middle of communications, or the JVM has run out of memory.

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Java: Declaring Your own Exceptions tutorial

You can create your own exceptions in Java. Keep the following points in mind when writing your own exception classes:

1. All exceptions must be a child of Throwable.
2. If you want to write a checked exception that is automatically enforced by the Handle or Declare Rule, you need to extend the Exception class.
3. If you want to write a runtime exception, you need to extend the RuntimeException class.

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