简单工厂模式与工厂方法模式

简单工厂模式与工厂方法模式

简单工厂模式

优点：简单，代码量少，清晰

缺点：新增一个产品，工厂的代码不能做到零修改

工厂方法模式

优点：新增一个产品，代码可以做到零修改，只做扩展

缺点：代码量过多，繁杂

注意：实践中还是简单工厂模式更好用

简单工厂模式代码

package com.example.designPattern23.factory.simple;

public class car {
}

package com.example.designPattern23.factory.simple;

public class Tesla extends car {
    public Tesla() {
        System.out.println("特斯拉");
    }
}

package com.example.designPattern23.factory.simple;

public class Wuling extends car {
    public Wuling() {
        System.out.println("五菱");
    }
}

package com.example.designPattern23.factory.simple;

public class CarFactory {
    private String name;


    public CarFactory(String name) {
        this.name = name;
    }

    public static Object get(String name) {
        if (name.equals("Wuling")) {
            return new Wuling();
        } else if (name.equals("Tesla")) {
            return new Tesla();
        } else {
            return null;
        }
    }
}

package com.example.designPattern23.factory.simple;

public class Consumer {
    public static void main(String[] args) {
        CarFactory.get("Tesla");
        CarFactory.get("Wulin");
    }
}

输出

特斯拉
五菱

工厂方法模式

package com.example.designPattern23.factory.method;

public class car {
}

package com.example.designPattern23.factory.method;

public class Tesla extends car {
    public Tesla() {
        System.out.println("特斯拉");
    }
}

package com.example.designPattern23.factory.method;

public class TeslaFactory {

    public void get() {
        System.out.println("特斯拉");
    }
}

package com.example.designPattern23.factory.method;

public class Wuling extends car {
    public Wuling() {
        System.out.println("五菱");
    }
}

package com.example.designPattern23.factory.method;

public class WulingFactory {
    public void get() {
        System.out.println("五菱");
    }
}

package com.example.designPattern23.factory.method;

public class Consumer {
    public static void main(String[] args) {
        TeslaFactory teslaFactory = new TeslaFactory();
        WulingFactory wulingFactory = new WulingFactory();

        teslaFactory.get();
        wulingFactory.get();
    }
}

输出

特斯拉
五菱