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.

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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();}}

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HelloA.java

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

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HelloB.java

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

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GoodByeA.java

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

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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();}}

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