java设计模式（八）适配器模式-优快云博客

本文介绍了适配器模式的概念及其在将鸭子接口与火鸡接口进行转换的应用实例，通过代码实现展示了如何让不兼容的类能够合作无间。

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【适配器模式】将一个类的接口，转换成客户期望的另外一个接口。适配器让原本接口不兼容的类可以合作无间。

1，Duck接口

package com.pattern.adapter;

public interface Duck {
	
	public void quack();
	public void fly();
	
}

2，Duck实现类

package com.pattern.adapter;

public class MallardDuck implements Duck{

	/** 
	 * @see com.pattern.adapter.Duck#quack()
	 */
	@Override
	public void quack() {
		System.out.println("Quack");
	}

	/** 
	 * @see com.pattern.adapter.Duck#fly()
	 */
	@Override
	public void fly() {
		System.out.println("I'm flying");
	}
	
}

3，Turkey接口

package com.pattern.adapter;

public interface Turkey {

	public void gobble();
	public void fly();
	
}

4，Turkey实现类

package com.pattern.adapter;

public class WildTurkey implements Turkey{

	/** 
	 * @see com.pattern.adapter.Turkey#gobble()
	 */
	@Override
	public void gobble() {
		System.out.println("Gobble gobble");
	}

	/** 
	 * @see com.pattern.adapter.Turkey#fly()
	 */
	@Override
	public void fly() {
		System.out.println("I'm flying a short distance");
	}

}

5，适配器类

package com.pattern.adapter;

public class TurkeyAdapter implements Duck{
	Turkey turkey;
	
	public TurkeyAdapter(Turkey turkey){
		this.turkey = turkey;
	}
	
	/** 
	 * @see com.pattern.adapter.Duck#quack()
	 */
	@Override
	public void quack() {
		turkey.gobble();
	}

	/** 
	 * @see com.pattern.adapter.Duck#fly()
	 */
	@Override
	public void fly() {
		for(int i=0;i<5;i++){
			turkey.fly();
		}
	}

}

6，测试类

package com.pattern.adapter;

public class DuckTestDrive {
	
	public static void main(String[] args) {
		MallardDuck 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("\n The Duck says...");
		testDuck(duck);
		
		System.out.println("\n TurkeyAdapter says...");
		testDuck(turkeyAdapter);
		
	}
	
	static void testDuck(Duck duck){
		duck.quack();
		duck.fly();
	}
}

输出结果为：

The Turkey says....
Gobble gobble
I'm flying a short distance

The Duck says...
Quack
I'm flying

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

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