final Java

Introduction

The keyword final protects variables from changes.

final variables

Let us name the example file Main.java

public class Main { final int x = 10; public static void main(String[] args) { Main myObj = new Main(); myObj.x = 7; // will generate an error System.out.println(myObj.x); } }

javac -encoding utf8 Main.java

Main.java:6: error: cannot assign a value to final variable x myObj.x = 7; ^ 1 error

Article author: Andrei Olegovich