Final keyword are used in java for three purpose; 1. Final keyword is used in java to make variable constant 2. Final keyword restrict method overriding 3. It used to restrict Inheritance http://www.tutorial4us.com/java/java-final-keyword

2. Final keyword in Java
Final keyword are used in java for three purpose;
 Final keyword is used in java to make variable constant
 Final keyword restrict method overriding
 It used to restrict Inheritance

4. Final at variable level
Final keyword is used at variable lever for make a
variable constant.

5. Final at method level
Final keyword is used at method level for restrict
method overriding

6. Final at class level
Final keyword is used at class level for restrict
Inheritance

8. Reference
http://www.tutorial4us.com/java/java-final-keyword