interface ServiceA{

public void methodA();

}

interface ServiceB{

public void methodB();

}

interface ServiceC{

public void methodC();

}

//Subsystemclasse*

class ServiceAImpl implements ServiceA {

public void methodA() {

System.out.println("这是服务A");

}

}

class ServiceBImpl implements ServiceB {

public void methodB() {

System.out.println("这是服务B");

}

}

class ServiceCImpl implements ServiceC {

public void methodC() {

System.out.println("这是服务C");

}

}

//Facade

class Facade {

ServiceA sa;

ServiceB sb;

ServiceC sc;

public Facade() {

sa = new ServiceAImpl();

sb = new ServiceBImpl();

sc = new ServiceCImpl();

}

public void methodA() {

sa.methodA();

//sb.methodB();

}

public void methodB() {

sb.methodB();

//sc.methodC();

}

public void methodC() {

sc.methodC();

//sa.methodA();

}

}

public class DF10_Facade {

public static void main(String[] args) {

ServiceA sa = new ServiceAImpl();

ServiceB sb = new ServiceBImpl();

sa.methodA();

sb.methodB();

System.out.println("========");

//facade

Facade facade = new Facade();

facade.methodA();

facade.methodB();

}

}