All about final keyword in java

1. final is a keyword to represent final version
2. final can be used for classes, methods and variables
3. if final is used for a class, that class can not be inherited. java.lang.String is the best example for final class from java API.
4. if final is used for a method, that method can not be overridden
5. if final is used for a variable, that variable becomes constant.