Overriding Member Methods

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If a class inherits a method from its super class, then there is a 
chance to override the method provided that it is not marked final.

Member overriding allows a subclass or child class to provide a specific implementation of a method that is already provided by one of its superclasses or parent classes. The implementation in the subclass overrides (replaces) the implementation in the superclass by providing a method that has same name, same parameters or signature, and same return type as the method in the parent class.

 class Animal
	{

   public void move()
	   {
      System.out.println("Animals can move");
   }
}

class Cat extends Animal
	{

   public void move()
	   {
      System.out.println("Cat can walk and run");
   }
}

public class Cat1
	{

   public static void main(String args[])
	   {
      Animal a = new Animal(); // Animal reference and object
      Animal b = new cat(); // Animal reference but Cat object

      a.move();// runs the method in Animal class

      b.move();//Runs the method in Cat class
   }