设计模式 - 适配器模式(adapter pattern) 详解

适配器模式(adapter pattern) 详解

本文地址: http://blog.csdn.net/caroline_wendy

适配器模式(adapter pattern): 将一个类的接口, 转换成客户期望的另一个接口. 适配器让原本不兼容的类可以合作无间.

适配器模式(adapter pattern)主要包括:

1. 被适配者接口(adaptee interface): 需要被适配的接口.

2. 适配器(adapter): 转换的类;

3. 目标接口(target interface): 需要转换成为的接口.

4. 客户(client): 具体使用的类.

具体方法:

1. 被适配者(adaptee interface)接口, 和实现接口具体的类.

/** * @time 2014年6月17日 */package adapter;/** * @author C.L.Wang * */public interface Turkey {public void gobble();public void fly();}/** * @time 2014年6月17日 */package adapter;/** * @author C.L.Wang * */public class WildTurkey implements Turkey {/* (non-Javadoc) * @see adapter.Turkey#gobble() */@Overridepublic void gobble() {// TODO Auto-generated method stubSystem.out.println("Gobble gobble! ");}/* (non-Javadoc) * @see adapter.Turkey#fly() */@Overridepublic void fly() {// TODO Auto-generated method stubSystem.out.println("I'm flying a short distance! ");}}

2. 目标接口(target interface), 和实现接口具体的类.

/** * @time 2014年6月17日 */package adapter;/** * @author C.L.Wang * */public interface Duck {public void quack();public void fly();}/** * @time 2014年6月17日 */package adapter;/** * @author C.L.Wang * */public class MallardDuck implements Duck {/* (non-Javadoc) * @see adapter.Duck#quack() */@Overridepublic void quack() {// TODO Auto-generated method stubSystem.out.println("Quack! ");}/* (non-Javadoc) * @see adapter.Duck#fly() */@Overridepublic void fly() {// TODO Auto-generated method stubSystem.out.println("I'm flying! ");}}

3. 适配器(adapter): 被适配者接口(adaptee interface) 转换 目标接口(target interface).

组合被适配者类接口, 实现目标类接口.

/** * @time 2014年6月17日 */package adapter;/** * @author C.L.Wang * */public class TurkeyAdapter implements Duck {Turkey turkey;public TurkeyAdapter (Turkey turkey) {this.turkey = turkey;}/* (non-Javadoc) * @see adapter.Duck#quack() */@Overridepublic void quack() {// TODO Auto-generated method stubturkey.gobble();}/* (non-Javadoc) * @see adapter.Duck#fly() */@Overridepublic void fly() {// TODO Auto-generated method stubfor (int i=0; i<5; ++i) { //多次飞行turkey.fly(); }}}

4. 客户(client)方法需要使用目标类, 

把被适配者(adaptee)的具体类, 通过适配器(adapter), 转换为目标(target)类, 进行调用:

/** * @time 2014年6月17日 */package adapter;/** * @author C.L.Wang * */public class DuckTestDrive {/** * @param args */public static void main(String[] args) {// TODO Auto-generated method stubMallardDuck duck = new MallardDuck();WildTurkey turkey = new WildTurkey();Duck turkeyAdapter = new TurkeyAdapter(turkey);System.out.println("The Turkey says ...");turkey.gobble();turkey.fly();System.out.println("\nThe Duck says ...");testDuck(duck);System.out.println("\nThe TurkeyAdapter says ...");testDuck(turkeyAdapter);}static void testDuck (Duck duck) {duck.quack();duck.fly();}}

5. 输出.

The Turkey says ...Gobble gobble! I'm flying a short distance! The Duck says ...Quack! I'm flying! The TurkeyAdapter says ...Gobble gobble! I'm flying a short distance! I'm flying a short distance! I'm flying a short distance! I'm flying a short distance! I'm flying a short distance!