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µÚ1Ìõ  How to Write an Equality Method in Java  
http://www.artima.com/lejava/articles/equality.html
How to Write an Equality Method in Java
by Martin Odersky, Lex Spoon, and Bill Venners
June 1, 2009
Summary
This article describes a technique for overriding the equals method t ......

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package com.wensefu.others;
public class Animal {

public void eat(){
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class Bird extends Animal{

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