Facade模式

为子系统中的一组接口提供一个一致的界面,此模式定义了一个高层接口,这个接口使得这一子系统更容易使用.
很常用,较好体现了依赖倒转原则和迪米特法则思想.

 

Facade.java

package com.gary.designpattern.facade;

/**
 * Facade类,需要了解子功能,并组合
 * @author gary
 *
 */
public class Facade {
	/**
	 * 组合hello方法,供其它方法调用
	 */
	public void sayHello(){
		System.out.println("say hello:");
		new HelloA().helloA();
		new HelloB().helloB();
	}
	
	/**
	 * goodbye
	 */
	public void sayGoodBye(){
		System.out.println("say goodbye:");
		new GoodByeA().goodByeA();
	}
}

 

HelloA.java

package com.gary.designpattern.facade;

/**
 * HelloA
 * @author gary
 *
 */
public class HelloA {
	public void helloA(){
		System.out.println("HelloA");
	}
}

 

HelloB.java

package com.gary.designpattern.facade;

/**
 * HelloB
 * @author gary
 *
 */
public class HelloB {
	public void helloB(){
		System.out.println("HelloB");
	}
}

 

GoodByeA.java

package com.gary.designpattern.facade;

/**
 * GoodByeA
 * @author gary
 *
 */
public class GoodByeA {
	public void goodByeA(){
		System.out.println("GoodByeA");
	}
}

 

Test.java

package com.gary.designpattern.facade;

/**
 * 测试
 * @author gary
 *
 */
public class Test {
	public static void main(String[] args) {
		Facade facade = new Facade();
		//只需调用sayHello,不需要知道具体都调用了哪个方法
		facade.sayHello();
		System.out.println("======split======");
		facade.sayGoodBye();
	}
}