Reference: super
When we override superclass‘s methods, but still want to invoke them, we can use keyword super in child classes. We can also use super to refer to a hidden field (although hiding fields is discouraged).
// Superclass is parent class public class Superclass { public void printMethod() { System.out.println("Printed in Superclass."); } } // Subclass is child class public class Subclass extends Superclass { // overrides printMethod in Superclass public void printMethod() { super.printMethod(); System.out.println("Printed in Subclass"); } public static void main(String[] args) { Subclass s = new Subclass(); s.printMethod(); } }
Compiling and executing Subclass prints the following:
Printed in Superclass. Printed in Subclass
We can also use super() or super(parameter list) to invoke superclass‘s constructor.
原文：http://www.cnblogs.com/ireneyanglan/p/4834157.html