Final keyword

                          Final keyword can be used before local variable ,instance variable,static variable,class and method.

1 

Before instance variable

                                         because of using final keyword before instance variable , it can be initialized in two way 1 in statement itself for eg public int x=10;2 by making constructor

2 

before static variable 

                                     Variable can be initialized in two way 1 with final keyword and by making static block

3

Before local variable 

                                     It can be initialized with final keyword itself and after that it can't be changed.

4 

before method  

                    Method can not be overridden .

5 

Before class

                   Class can't have its subclass and can't extends

For next "This" keyword See my next blog