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加容易使用。
看个例子
package constructional.pattern.facade; /// <summary> /// 外观类 /// </summary> public class Facade { private SubSystemOne one; private SubSystemTwo two; private SubSystemThree three; private SubSystemFour four; public Facade() { one = new SubSystemOne(); two = new SubSystemTwo(); three = new SubSystemThree(); four = new SubSystemFour(); } public void MethodA() { System.out.println("\nMethod group A----"); one.MethodeOne(); two.MethodTwo(); four.MethodFour(); } public void MethodB() { System.out.println("\nMethod group B----"); two.MethodTwo(); three.MethodThree(); } } package constructional.pattern.facade; /// <summary> /// 子系统中的一个类 /// </summary> public class SubSystemOne { public void MethodeOne() { System.out.println("Sub System first method."); } } package constructional.pattern.facade; /// <summary> /// 子系统中一个类 /// </summary> public class SubSystemTwo { public void MethodTwo() { System.out.println("Sub System second method."); } } package constructional.pattern.facade; /// <summary> /// 子系统中一个类 /// </summary> public class SubSystemThree { public void MethodThree() { System.out.println("Sub System third method."); } } package constructional.pattern.facade; /// <summary> /// 子系统中一个类 /// </summary> public class SubSystemFour { public void MethodFour() { System.out.println("Sub System fourth method."); } }测试代码
package constructional.pattern.facade; public class Client { public static void main(String[] args) { // 由于Facade的作用，客户端可以根本不知道子系统类的存在 Facade facade = new Facade(); facade.MethodA(); facade.MethodB(); } }运行结果
转载于:https://www.cnblogs.com/liunianfeiyu/p/10116559.html
