Java適配器模式的兩種分類以及具體應用場景

1、類別適配器模式

實作方式：定義一個適配器類別來實作目前系統的業務接口，同時又繼承現有元件庫中已經存在的元件。

public class HelloWorld {
    public static void main(String[] args) {
        Computer computer = new Computer();
        SDCard sdCard = new SDCardImpl();
        System.out.println(computer.readSD(sdCard));
 
        System.out.println("------------");
 
        SDAdapterTF adapter = new SDAdapterTF();
        System.out.println(computer.readSD(adapter));
    }
}
 
// SD卡的接口
interface SDCard {
    // 读取SD卡功能
    String readSD();
 
    // 写入SD卡功能
    void writeSD(String msg);
}
 
// SD卡实现类
class SDCardImpl implements SDCard {
    @Override
    public String readSD() {
        String msg = "sd card read a msg: hello sd card";
        return msg;
    }
 
    @Override
    public void writeSD(String msg) {
        System.out.println("sd card write msg: " + msg);
    }
}
 
// 电脑类
class Computer {
    public String readSD(SDCard sdCard) {
        if (sdCard == null) {
            throw new NullPointerException("sd card null");
        }
        return sdCard.readSD();
    }
}
 
// TF卡接口
interface TFCard {
    // 读取TF卡功能
    String readTF();
 
    // 写入TF卡功能
    void writeTF(String msg);
}
 
// TF卡实现类
class TFCardImpl implements TFCard {
    @Override
    public String readTF() {
        String msg = "sd card read a msg: hello tf card";
        return msg;
    }
 
    @Override
    public void writeTF(String msg) {
        System.out.println("tf card write msg: " + msg);
    }
}
 
// 定义适配器类（SD兼容TF）
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 write tf card");
        writeTF(msg);
    }
}

2、物件適配器模式

實作方式：物件適配器模式可採用將現有元件庫中已實作的元件引入適配器中，該類別同時實現目前系統的業務介面。

public class HelloWorld {
    public static void main(String[] args) {
        Computer computer = new Computer();
        SDCard sdCard = new SDCardImpl();
        System.out.println(computer.readSD(sdCard));
 
        System.out.println("------------");
        
        TFCard tfCard = new TFCardImpl();
        SDAdapterTF adapter = new SDAdapterTF(tfCard);
        System.out.println(computer.readSD(adapter));
    }
}
 
// SD卡的接口
interface SDCard {
    // 读取SD卡功能
    String readSD();
 
    // 写入SD卡功能
    void writeSD(String msg);
}
 
// SD卡实现类
class SDCardImpl implements SDCard {
    @Override
    public String readSD() {
        String msg = "sd card read a msg: hello sd card";
        return msg;
    }
 
    @Override
    public void writeSD(String msg) {
        System.out.println("sd card write msg: " + msg);
    }
}
 
// 电脑类
class Computer {
    public String readSD(SDCard sdCard) {
        if (sdCard == null) {
            throw new NullPointerException("sd card null");
        }
        return sdCard.readSD();
    }
}
 
// TF卡接口
interface TFCard {
    // 读取TF卡功能
    String readTF();
 
    // 写入TF卡功能
    void writeTF(String msg);
}
 
// TF卡实现类
class TFCardImpl implements TFCard {
    @Override
    public String readTF() {
        String msg = "sd card read a msg: hello tf card";
        return msg;
    }
 
    @Override
    public void writeTF(String msg) {
        System.out.println("tf card write msg: " + msg);
    }
}
 
// 定义适配器类（SD兼容TF）
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 write tf card");
        tfCard.writeTF(msg);
    }
}

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