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package com.wensefu.others;
public class Animal {

public void eat(){
System.out.println("animal eatting...");
}
}
class Bird extends Animal{

public void eat(){
System.out.println("bird eatting...");
}

public void fly(){

System.out.println("bird flying...");
}
}
class Main{

public static void main(String[] args) {

Animal b=new Bird(); //ÏòÉÏתÐÍ
b.eat();
//! error: b.fly(); bËäÖ¸Ïò×ÓÀà¶ÔÏ󣬵«´Ëʱ¶ªÊ§fly()·½·¨
dosleep(new Male());
dosleep(new Female());
}

public static void dosleep(Human h) {
h.sleep();
}
}
package com.wensefu.others;
public class Human {
public void sleep() {
System.out.println("Human sleep..");
}
}
class Male extends Human {
@Override
public void sleep() {
System.out.println("Male sleep..");
}
}
class Female extends Human {
@Override
public void sleep() {
System.out.println("Female sleep..");
}
}
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        Animal b=new Bird(); //ÏòÉÏתÐÍ
        b.eat();
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    public static void dosleep(Human h) {
        h.sleep();
    }
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package com.wensefu.other1;
public class Girl {
public void smile(){
System.out.println("girl smile()...");
}
}
class M


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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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