适配器模式（Adapter）（对象结构型模式）

参考文档：

1.设计模式-可复用面向对象软件的基础

2.http://blog.csdn.net/guolin_blog/article/details/9400141（Java设计模式透析之 —— 适配器(Adapter)）

适配器模式（Adapter）（对象结构型模式）

理论方面的知识，请查看参考文档的内容。

看一下adapter的结构：

类适配器，在java中的实现，表现为实现多个接口类，进行匹配：



对象适配器，在java中的实现，表现为对象组合：



代码实现，案例是参考文档2中的，实现的方式是：对象适配器，实现adapter的类：ServerOne.java。

PlayerCount.java:

package com.rick.designpattern.adapter;

/**
* Created by MyPC on 2017/6/29.
*/
public interface PlayerCount {

String getServerName();

int getPlayerCount();

}

ServerOne.java:

package com.rick.designpattern.adapter;

/**
* Created by MyPC on 2017/6/29.
*/
public class ServerOne implements PlayerCount {
@Override
public String getServerName() {
return "1服";
}

@Override
public int getPlayerCount() {
return new ServerFirst().getOnlinePlayerCount();
}
}

ServerTwo.java:

package com.rick.designpattern.adapter;

/**
* Created by MyPC on 2017/6/29.
*/
public class ServerTwo implements PlayerCount {
@Override
public String getServerName() {
return "2服";
}

@Override
public int getPlayerCount() {
return Utility.getOnlinePlayerCount(2);
}
}

ServerThree.java:

package com.rick.designpattern.adapter;

/**
* Created by MyPC on 2017/6/29.
*/
public class ServerThree implements PlayerCount {
@Override
public String getServerName() {
return "3服";
}

@Override
public int getPlayerCount() {
return Utility.getOnlinePlayerCount(3);
}
}

Utility.java:

package com.rick.designpattern.adapter;

/**
* Created by MyPC on 2017/6/29.
*/
public class Utility {
public static int getOnlinePlayerCount(int i) {
return (int) (Math.random() * 100);
}
}

ServerFirst.java:

package com.rick.designpattern.adapter;

/**
* Created by MyPC on 2017/6/29.
*/
public class ServerFirst {
public int getOnlinePlayerCount() {
return (int) (Math.random() * 100);
}
}

Client.java:

package com.rick.designpattern.adapter;

/**
* Created by MyPC on 2017/6/29.
*/
public class Client {

public static void main(String[] args) {
ServerOne one = new ServerOne();
System.out.println(one.getServerName() + "=" + one.getPlayerCount());
ServerTwo two = new ServerTwo();
System.out.println(two.getServerName() + "=" + two.getPlayerCount());
ServerThree three = new ServerThree();
System.out.println(three.getServerName() + "=" + three.getPlayerCount());
}
}