final Its a constant declaration.
finally It handles exception. It is an optional block to write at the end of your exception handling block. It is usually used to close files, close database connections and statements. Also release all other resources in this block.
finalize This method is called by the garbage collector. Garbage collector always called this method before it performs garbage collection on that object. It should not be used to release
All Java classes inherits the finalize() method from java.lang.Object and this method is called by the garbage collector when it determines no more references to the object exist.
The finalize method performs no actions but it may be overridden by any class. It is overridden to clean-up non-Java resources ie closing a file, closing a connection etc. In overridding finalize() it is a good programming practice to use a try-catch-finally statement and to always call super.finalize().