super keyword in Java

super variable refers immediate parent class instance.
super variable can invoke immediate parent class method.
super() acts as immediate parent class constructor and should be first line in child class constructor.

When invoking a superclass version of an overridden method the super keyword is used.

Example

class Animal {
   public void move() {
      System.out.println("Animals can move");
   }
}
class Dog extends Animal {
   public void move() {
      super.move(); // invokes the super class method
      System.out.println("Dogs can walk and run");
   }
}
public class TestDog {
   public static void main(String args[]) {
      Animal b = new Dog(); // Animal reference but Dog object
      b.move(); // runs the method in Dog class
   }
}

Output

This will produce the following result −

Animals can move
Dogs can walk and run

Krantik Chavan

Published on 02-Feb-2018 11:00:06

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