设计模式Demo之简单工厂模式（含代码）

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最新推荐文章于 2025-06-02 13:54:27 发布

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分类专栏：设计模式 java基础文章标签： java 设计模式后端

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本文介绍了简单工厂模式的主要优点，如简化客户端创建对象的职责，隐藏产品类的实现细节。同时，也讨论了其缺点，包括职责过重可能导致系统受影响，增加系统复杂度，扩展困难等。适用场景为创建对象较少且客户端不关注对象创建过程的情况。

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简单工厂模式

主要优点简单工厂模式的主要优点如下：
(1) 工厂类包含必要的判断逻辑，可以决定在什么时候创建哪一个产品类的实例，客户端可以免除直接创建产品对象的职责，而仅仅“消费”产品，简单工厂模式实现了对象创建和使用的分离。工厂三兄弟之简单工厂模式（四）
(2) 客户端无须知道所创建的具体产品类的类名，只需要知道具体产品类所对应的参数即可，对于一些复杂的类名，通过简单工厂模式可以在一定程度减少使用者的记忆量。
(3) 通过引入配置文件，可以在不修改任何客户端代码的情况下更换和增加新的具体产品类，在一定程度上提高了系统的灵活性。
主要缺点简单工厂模式的主要缺点如下：
(1) 由于工厂类集中了所有产品的创建逻辑，职责过重，一旦不能正常工作，整个系统都要受到影响。
(2) 使用简单工厂模式势必会增加系统中类的个数（引入了新的工厂类），增加了系统的复杂度和理解难度。
(3) 系统扩展困难，一旦添加新产品就不得不修改工厂逻辑，在产品类型较多时，有可能造成工厂逻辑过于复杂，不利于系统的扩展和维护。
(4) 简单工厂模式由于使用了静态工厂方法，造成工厂角色无法形成基于继承的等级结构。
适用场景在以下情况下可以考虑使用简单工厂模式：
(1) 工厂类负责创建的对象比较少，由于创建的对象较少，不会造成工厂方法中的业务逻辑太过复杂。
(2) 客户端只知道传入工厂类的参数，对于如何创建对象并不关心。

package com.myzy.auth.designpatterns;


//测试简单工厂模式，生产不同的手机
public class TestSimpleFactoryPattern {
    //定义抽象类手机生产
    static abstract class PhoneProduct {
        //定义抽象方法
        public abstract String productPhone();
    }
//--------------------------------------------------------------------------------------------
    /**
     * 不同手机各自实现，符合单一设计原则，以及开闭原则
     */
    static class HuaWeiPhone extends PhoneProduct {

        @Override
        public String productPhone() {
            return "华为手机";
        }
    }

    static class XiaoMiPhone extends PhoneProduct {

        @Override
        public String productPhone() {
            return "小米手机";
        }
    }

    static class ApplePhone extends PhoneProduct {

        @Override
        public String productPhone() {
            return "苹果手机";
        }
    }
//---------------------------------------------------------------------------------------------

    //定义简单工厂来创建产品
    static class SimplePhonePrudctFactory {
        //通过type判断需要生产的手机
        public static String getProduct(String type) {
            if ("xiaomi".equals(type)) {
                return new XiaoMiPhone().productPhone();
            } else if ("huawei".equals(type)) {
                return new HuaWeiPhone().productPhone();
            } else if ("apple".equals(type)) {
                return new ApplePhone().productPhone();
            } else {
                return null;
            }
        }
    }

    //测试
    public static void main(String[] args) {
        System.out.println(SimplePhonePrudctFactory.getProduct("xiaomi"));//参数可从配置中获取
        System.out.println(SimplePhonePrudctFactory.getProduct("huawei"));
        System.out.println(SimplePhonePrudctFactory.getProduct("apple"));
    }
}

执行结果

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com.myzy.auth.designpatterns.TestSimpleFactoryPattern
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