工厂模式

图片来自于知乎。大火看看就好不用点赞/

代码

public abstract class Mouse {
    public abstract void click();
}

public class DellMouse  extends  Mouse{
    @Override
    public void click() {
        System.out.println("dell click");
    }
}
public class HpMouse extends Mouse{
    @Override
    public void click() {
        System.out.println("hp click");
    }
}
public class MouseFactory {

    public  Mouse createMouse(int i)
    {
        switch (i)
        {
            case 0:
                return new DellMouse();
            case 1:
                return new HpMouse();
            default:
                return null;
        }
    }

    public static void main(String[] args) {
        Mouse mouse = new MouseFactory().createMouse(0);
        mouse.click();
    }
}

心得一

简单工厂感觉太容易出错了。比如说你要输入0不小心输入1生产的鼠标就错误了。
而且简单工厂对于再增加新的类 如 HUAWEIMouse 还要修改代码不太行。

鼠标的代码一样

public interface MouseFactory {
    public  Mouse createMouse();
}
public class HPMosueFactory implements  MouseFactory{
    @Override
    public Mouse createMouse() {
        return new HpMouse();
    }
}
public class DellMouseFactory implements MouseFactory{
    @Override
    public Mouse createMouse() {
        return new DellMouse();
    }
}
public class Run {
    public static void main(String[] args) {
        new DellMouseFactory().createMouse().click();
        new HPMosueFactory().createMouse().click();
    }
}

但是我有一个疑问，这样的话还要代码作甚。直接new DellMouse()不就完事了。