Method Overriding

Method Overriding

If you define the same method in the child class as the parent class, this concept is called overriding. The concept of overriding allows you to provide an implementation of the method in the child class, which is already present in the parent class. With the help of the method overriding, you can implement runtime polymorphism.

Method overriding rules-

Below are some rules that need to be kept in mind while implementing overriding-

• The method name should be the same as the parent class.
• The implemented method should have the same number and data type of the parameters.
• There should be an IS-A relationship to achieve method overriding.

Example without Method Overriding

class Vehicle{  
  void run(){System.out.println("running");}  
}  

//Child class  
class Scooter extends Vehicle{  
     public static void main(String args[]){   
     Scooter obj = new Scooter ();  
     obj.run();  
  }  
}  

Output-

running 

Example with Method Overriding

class Vehicle{  
  void run(){System.out.println("Running");}  
}  

//Child class  
class Scooter extends Vehicle{  
  void run(){System.out.println("Scooter is running");}  
  
  public static void main(String args[]){  
     Scooter obj = new Scooter(); 
     obj.run();
  }
}

Output-

Scooter is running

Note-

It is not possible to override the static method as the static method is bound with the class while the instance method is bound to the object. That is why we cannot override the main method because it is also static.

Difference between Overriding and Overloading