Java-Rewritten Learning

This article turns from: http://www.cnblogs.com/happyframework/p/3332243.html, thank you very much.

The rewrite rules in Java are more flexible, as follows:

1. All instance methods except the private adornment can be overridden, and no explicit declaration is required.
2. Overridden methods to explicitly override this concept, use @Override to annotate.
3. Overridden methods can modify access modifiers and return types as long as they are compatible with the methods of the parent class (higher access levels and more specific return types).
4. You can use final to mark a method as non-overridable.
5. In the construction method, use super (XXX, XXX) to call the parent class construction method, using Super.method (XXX, XXX) in the regular instance method to call the parent class method.
6. Java does not support overwrite (new).

public class Test {/*** @param args*/public static void Main (string[] args) {Animal Animal = new Animal (); Animal dog = new Dog (), Animal.say ();d Og.say (); Animal.eat (Animal);d og.eat (dog); System.out.println (Animal.info ()); System.out.println (Dog.info ());}} Class Animal {private String name = "Animal";p rotected Void Say () {System.out.println ("Animal" + "" + THIS.name);} public void Eat (Animal food) {System.out.println ("Animal eat" + food);} Public Object info () {return "Animal";} @Overridepublic String toString () {return "Animal";}} Class Dog extends Animal {private String name = "Dog"; @Overridepublic final void Say () {System.out.println ("dog" + "" + t His.name);} @Overridepublic final void Eat (Animal food) {super.eat (food); System.out.println ("Dog eated");} @Overridepublic final String info () {return "Dog";} @Overridepublic final String toString () {return "Dog";}}

　　

Java-Rewritten Learning