门面模式

简介

结构型模式，也叫外观模式，封装复杂子系统或流程，对外提供一个方便调用的统一api，屏蔽子系统/流程细节。

示例

public class SubSystem_A {
    public void doSomeThing(){
        System.out.println("SubSystem_A do some thing!");
    }
}

public class SubSystem_B {
    public void doSomeThing(){
        System.out.println("SubSystem_B do some thing!");
    }
}

public class SubSystem_C {
    public void doSomeThing(){
        System.out.println("SubSystem_C do some thing!");
    }
}

public class Facade {
    private SubSystem_A subSystem_a = new SubSystem_A();
    private SubSystem_B subSystem_b = new SubSystem_B();
    private SubSystem_C subSystem_c = new SubSystem_C();

    public void doSomeThing_A() {
        subSystem_a.doSomeThing();
    }

    public void doSomeThing_B() {
        subSystem_b.doSomeThing();
    }

    public void doSomeThing_C() {
        subSystem_c.doSomeThing();
    }

    public void allDoSomeThing() {
        subSystem_a.doSomeThing();
        subSystem_b.doSomeThing();
        subSystem_c.doSomeThing();
    }
}

调用

@Test
public void tt(){
    Facade facade = new Facade();
    facade.doSomeThing_A();
    facade.doSomeThing_B();
    facade.doSomeThing_C();
    facade.allDoSomeThing();
}