Cleaning up-The finally Clause:

One of the things we often want to do after an exception has occurred is to 'clean up' by releasing any resources such as memory or files that a method has been using before the exception was thrown. This allows these resources to be used by other parts of the program or other programs.

We can do this in a catch clause, but if we have several catch clauses this may require repeating the clean-up code in each catch clause, as well as within the try block to deal with normal execution. In this situation, it is easy to omit accidentally the clean-up code from one of the catch clauses - such errors are often hard to find.

To deal with this, Java provides another facility in the try statement - the finally clause. Code in the finally clause will be executed at the end of the try statement, whether or not execution was interrupted by an exception. If an exception occurred then the appropriate catch clause, if any, will be executed, followed by the code in the finally clause. If an exception did not occur, all the code in the try block would be executed followed by the clean-up code in the finally clause.

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