In Java, the final keyword is used to restrict changes. Once something is marked as final, it cannot be modified further. It can be applied in three main places: variables, methods, and classes. 1. Final Variable A final variable acts like a constant — its value cannot be changed once assigned. public class GRT { final int price = 15000 ; public void display (){ GRT grt = new GRT (); grt . price = 200 ; System . out . println ( grt . price ); } } Enter fullscreen mode Exit fullscreen mode Key point: You must assign value once After that, no reassignment allowed 2. Final Method A final method cannot be overridden by subclasses. class Parent { final void show () { System . out . println ( "This is final method" ); } } class Child extends Parent { // void show() { } ❌ Error: cannot override final method } Enter fullscreen mode Exit fullscreen mode Key point: Used when you want to prevent method overriding 3. Final Class A final class cannot be extended (inherited). final class A { void display () { System .…