Method Overriding

• If a subclass and parent class have the same method then it is known as Method overriding
• Used to provide the specific implementation of a method which already exists in its superclass

Rules for method overriding

• The two classes must be in inheritance
• Final methods cannot be overridden
• Static methods cannot be overridden
• Private methods cannot be overridden
• The overriding method must have the same return type

Example without overriding

class A {  
  void show() {
    System.out.println("This is class A");
  }  
}  
 
class B extends A {  
  void show(){
    System.out.println("This is class B");
  }  
  
  public static void main(String args[]) {
	A ob1 = new A();  
    B ob2 = new B();
    ob1.show();
    ob2.show();
  }  
}  

check output here

Example with overriding

class A {  
  void show() {
    System.out.println("This is class A");
  }  
}  
 
class B extends A {  
  void show(){
    System.out.println("This is class B");
  }  
  
  public static void main(String args[]) {  
    B ob = new B();
    ob.show();
  }  
}  

check output here

This will output This is class B
The show() method in class B overrides show() method in class A.