适配器设计模式

1.类适配器模式

package com.jmj.pattern.adapter.class_adapter;

/**
 * 目标接口
 */
public interface SDCard {

    //从SD卡中读取数据
    String readSD();
    //往SD卡中写数据
    void writeSD(String msg);



}

package com.jmj.pattern.adapter.class_adapter;

/**
 * 具体的SD卡类
 */
public class SDCardImpl implements SDCard{
    @Override
    public String readSD() {
        String msg="SDCard read msg : hello word SD";
        return msg;
    }

    @Override
    public void writeSD(String msg) {
        System.out.println("SDCard write msg ：" + msg);
    }
}

package com.jmj.pattern.adapter.class_adapter;

/**
 * 适配者类的接口
 */
public interface TFCard {

    //从TF卡中读取数据
    String readTF();
    //往TF卡中写数据
    void writeTF(String msg);



}

package com.jmj.pattern.adapter.class_adapter;

/**
 * 适配者类
 */
public class TFCardImpl implements TFCard{
    @Override
    public String readTF() {
        return "TFCard read msg: hello word TFCard";
    }

    @Override
    public void writeTF(String msg) {
        System.out.println("TFCard write msg :"+msg);
    }


}

package com.jmj.pattern.adapter.class_adapter;

/**
 * 计算机类
 */
public class Computer {


    //从SD卡中读取数据
    public String readSD(SDCard sdCard) {
        if (sdCard == null) {
            throw new NullPointerException("sd card is not null");
        }
        return sdCard.readSD();
    }






}

package com.jmj.pattern.adapter.class_adapter;

/**
 * 适配器类
 */
public class SDAdapterTF extends TFCardImpl implements SDCard {


    @Override
    public String readSD() {
        System.out.println("adapter read tf card");
        return readTF();
    }

    @Override
    public void writeSD(String msg) {
        System.out.println("adapter wirte tf card");
        writeTF(msg);
    }
}

package com.jmj.pattern.adapter.class_adapter;

public class Client {
    public static void main(String[] args) {
        Computer computer = new Computer();
        String s = computer.readSD(new SDCardImpl());
        System.out.println(s);

        System.out.println("=======================");
        //使用该电脑   读取TF卡中的数据
        //定义适配器类
        Computer computer1 = new Computer();
        String s1 = computer1.readSD(new SDAdapterTF());
        System.out.println(s1);

    }
}

2.对象适配器模式

package com.jmj.pattern.adapter.object_adapter;

import com.jmj.pattern.adapter.class_adapter.TFCardImpl;

/**
 * 适配器类
 */
public class SDAdapterTF implements SDCard {

    private TFCard tfCard;
    public SDAdapterTF(TFCard tfCard){
        this.tfCard=tfCard;
    }

    @Override
    public String readSD() {
        System.out.println("adapter read tf card");
        return tfCard.readTF();
    }

    @Override
    public void writeSD(String msg) {
        System.out.println("adapter wirte tf card");
        tfCard.writeTF(msg);
    }
}