What is a java destructor?

A destructor is exactly the opposite... it gives the object a chance to grab any objects that need to be free'd prior to being freed itself. If care is not taken to "free" objects that have been used but are no longer required this is what is sometimes called a "memory leak". The memory allocated to that object is lost for use. It cannot be re-used for anything else because it is considered "still allocated" even though it is not in use. Generally, this type of program runs out of memory if it is something that runs for days without being restarted.

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