外观模式-大话设计模式

public class SubSystemOne {
    public void methodOne(){
        System.out.println("子系统方法一");
    }
}
public class SubSystemTwo {
    public void methodTwo() {
        System.out.println("子系统方法二");
    }
}
public class SubSystemThree {
    public void methodThree(){
        System.out.println("子系统方法三");
    }
}
public class SubSystemFour {
    public void methodFour(){
        System.out.println("子系统方法四");
    }
}
//外观类
public class Facade {
    SubSystemOne one;
    SubSystemTwo two;
    SubSystemThree three;
    SubSystemFour four;
 
    public Facade() {
        this.one = new SubSystemOne();
        this.two = new SubSystemTwo();
        this.three = new SubSystemThree();
        this.four = new SubSystemFour();
    }
    public void MethodA(){
        one.methodOne();
        two.methodTwo();
        three.methodThree();
        four.methodFour();
    }
 
    public void methodB(){
        two.methodTwo();
        three.methodThree();
    }
}
 
 
    public static void main(String[] args) {
        Facade facade = new Facade();
        facade.methodB();
    }