外观模式 - 代码指南

本文档详细说明外观模式的代码实现和使用方法

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一、项目结构

facade/
├── SubSystemA.java    # 子系统A
├── SubSystemB.java    # 子系统B
├── SubSystemC.java    # 子系统C
└── Facade.java        # 外观类

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二、代码详解

2.1 SubSystemA - 子系统A

package com.linsir.designpattern.facade;

public class SubSystemA {
    public void operationA() {
        System.out.println("子系统A的操作");
    }
}

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2.2 SubSystemB - 子系统B

package com.linsir.designpattern.facade;

public class SubSystemB {
    public void operationB() {
        System.out.println("子系统B的操作");
    }
}

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2.3 SubSystemC - 子系统C

package com.linsir.designpattern.facade;

public class SubSystemC {
    public void operationC() {
        System.out.println("子系统C的操作");
    }
}

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2.4 Facade - 外观类

package com.linsir.designpattern.facade;

public class Facade {
    private SubSystemA subSystemA;
    private SubSystemB subSystemB;
    private SubSystemC subSystemC;

    public Facade() {
        subSystemA = new SubSystemA();
        subSystemB = new SubSystemB();
        subSystemC = new SubSystemC();
    }

    public void operation() {
        subSystemA.operationA();
        subSystemB.operationB();
        subSystemC.operationC();
    }
}

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三、使用示例

public class FacadeTest {
    public static void main(String[] args) {
        // 使用外观类简化操作
        Facade facade = new Facade();
        facade.operation();
    }
}

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四、相关文档

• 设计模式概述