Instance variable as final in Java

final is a non-access modifier for Java elements. The final modifier is used for finalizing the implementations of classes, methods, and variables. A final instance variable can be explicitly initialized only once.

A final instance variable should be initialized at one of the following occasions −

  • At time of declaration.

  • In constructor.

  • In instance block.

Compiler will throw error, it a final variable is not initialized at all using any of the above methods. Following examples showcases example of instance variables as final.


 Live Demo

public class Tester{
   final int A = 1;
   final int B;{
      B = 2;
   final int C;
      C = 3;

   public static void main(String[] args) {
      Tester t = new Tester();
      System.out.println("A = " + t.A + ", B = " + t.B + ", C = " + t.C);


A = 1, B = 2, C = 3

Updated on: 23-Jun-2020

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