throw : Java Glossary
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throw
To trigger an exception. What happens to handle the exception depends on enclosing try-catch blocks or failing that in the enclosing try-catch blocks in the calling method, or its caller etc.

For unchecked Exceptions ( i.e. Errors and RuntimeExceptions such as IllegalArgumentException) the throws IllegalArgumentException is optional. I find them useful documentation since they show up in the Javadoc.

Exception
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