JAVA final keyword, definition of constants

Final (final) is a modifier
1, final can be modified classes, functions, variables (member variables, local variables)
2, the final modified class can not be inherited by other classes
3, the final modified method (function) can not be rewritten
4, the final modified variable (attribute) is not allowed to be re-assigned, final in the modification of the variable must be assigned, the final modified variable, we call the constant

Define constants: Final type uppercase constant name = constant value
Constant naming specification: All letters should be capitalized, if the name is made up of multiple words, the words are separated by _

 Public class test{    publicstaticvoid  main (string[] args) {        final String Title    =    "title";    // defines a constant of type string         System.out.println (TITLE);}    }

JAVA final keyword, definition of constants