14 结构性模式-适配器模式

1 适配器模式介绍

适配器模式(adapter pattern )的原始定义是：将类的接口转换为客户期望的另一个接口，适配器可以让不兼容的两个类一起协同工作。
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2 适配器模式原理

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3 适配器模式应用实例

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/*** SD卡接口**/
public interface SDCard {//读取SD卡String readSD();//写入SD卡void writeSD(String msg);
}

/*** SD卡实现类**/
public class SDCardImpl implements SDCard {@Overridepublic String readSD() {String msg = "sd card reading data";return msg;}@Overridepublic void writeSD(String msg) {System.out.println("sd card write data : " + msg);}
}

/*** TF卡接口**/
public interface TFCard {//读取TF卡String readTF();//写入TF卡void writeTF(String msg);
}

public class TFCardImpl implements TFCard {@Overridepublic String readTF() {String msg = "tf card reading data";return msg;}@Overridepublic void writeTF(String msg) {System.out.println("tf card write data : " + msg);}
}

/*** 适配器类(SD兼容TF)**/
public class SDAdapterTF  extends TFCardImpl implements SDCard{@Overridepublic String readSD() {System.out.println("adapter read tf card");return readTF();}@Overridepublic void writeSD(String msg) {System.out.println("adapter write tf card");writeTF(msg);}
}

/*** 电脑类**/
public class Computer {public String read(SDCard sdCard){String data = sdCard.readSD();return data;}
}

public class Client {public static void main(String[] args) {Computer computer = new Computer();SDCard sdCard = new SDCardImpl();String read = computer.read(sdCard);System.out.println(read);System.out.println("=====================");SDAdapterTF adapterTF = new SDAdapterTF();System.out.println(computer.read(adapterTF));}
}

4. 对象适配器模式

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/*** 对象适配器-组合形式**/
public class SDAdapterTF2  implements SDCard {private TFCard tfCard;public SDAdapterTF2(TFCard tfCard) {this.tfCard = tfCard;}@Overridepublic String readSD() {System.out.println("adapter read tf card");return tfCard.readTF();}@Overridepublic void writeSD(String msg) {System.out.println("adapter write tf card");tfCard.writeTF(msg);}
}

public class Client {public static void main(String[] args) {Computer computer = new Computer();SDCard sdCard = new SDCardImpl();System.out.println(computer.read(sdCard));System.out.println("=======================");TFCard tfCard = new TFCardImpl();SDAdapterTF2 adapterTF2 = new SDAdapterTF2(tfCard);System.out.println(computer.read(adapterTF2));}
}