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Final Variables
When a variable is declared with the final keyword, its value can’t be modified, essentially, a constant. This also means that you must initialize a final variable. If the final variable is a reference, this means that the variable cannot be re-bound to reference another object, but the internal state of the object pointed by that reference variable can be changed i.e. you can add or remove elements from the final array or final collection. It is good practice to represent final variables in all uppercase, using underscore to separate words.

    // a final variable
    // direct initialize
    final int number1 = 5;
      
    // a blank final variable
    final int number2;
      
    // another blank final variable
    final int  number3;
      
    // a final static variable PI
    // direct initialize
    static final double PI = 3.141592653589793;
      
    // a  blank final static  variable
    static final double number4;

If you make any variable as final, you cannot change the value of final variable(It will be constant).

If you don't want others (or yourself) to overwrite existing values, use the final keyword (this will declare the variable as "final" or "constant", which means unchangeable and read-only):

final int num = 1500;
num = 20; // will generate an error: cannot assign a value to a final variable

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