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How to Throw Exceptions
Before you can catch an exception, some code somewhere must throw one. Any code can throw an exception: your code, code from a package written by someone else such as the packages that come with the Java platform, or the Java runtime environment.
Java throw exception with message
Regardless of what throws the exception, it's always thrown with the statement.
As you have probably noticed, the Java platform provides numerous exception classes. All the classes are descendants of the class, and all allow programs to differentiate among the various types of exceptions that can occur during the execution of a program.
You can also create your own exception classes to represent problems that can occur within the classes you write.
In fact, if you are a package developer, you might have to create your own set of exception classes to allow users to differentiate an error that can occur in your package from errors that occur in the Java platform or other packages.
You can also create chained exceptions.
For more information, see the Chained Exceptions section.
The throw Statement
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