nasrabadiAM/final in java.md

## final in java.md

      
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              final in java.md
            
          
    what final keyword do in java and how to use it
final classes

any class that defines final will not be subclassed.
you can not extends any class from a final class.
final methods

any method that defines final will not be overriden.
you can not override final methods.
final variables

final variables initiated only once.
if you define setter for a final variable, you will get a compile time error from the compiler.