结构型模式：11-外观模式

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class SubSystemA {
    public void MethodA() {
        //业务实现代码
    }
}

class SubSystemB {
    public void MethodB() {
        //业务实现代码
    }
}

class SubSystemC {
    public void MethodC() {
        //业务实现代码
    }
}

class Facade {
    private SubSystemA obj1 = new SubSystemA();
    private SubSystemB obj2 = new SubSystemB();
    private SubSystemC obj3 = new SubSystemC();

    public void Method() {
        obj1.MethodA();
        obj2.MethodB();
        obj3.MethodC();
    }
}

class Program {
    public static void main(String[] args) {
        Facade facade = new Facade();
        facade.Method();
    }
}

抽象外观类

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