java设计模式（八） 适配器模式

【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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