简单工厂模式

简单工厂模式

声明:以下例子来自浪曦中的教程,不过有些改动,如果哪里有疑问,可直接访问浪曦网站

简单工厂模式又叫静态工厂模式,顾名思义,它是用来实例化目标类的静态类.

interface Car{
    public abstract void run();
    public abstract void stop();
}

class Beaz implements Car{
    public void run(){
        System.out.println("Beaz开车了");
    }
    public void stop(){
        System.out.println("Beaz停车了");
    }
}

class Ford implements Car{
    public void run(){
        System.out.println("Ford开车了");
    }
    public void stop(){
        System.out.println("Ford停车了");
    }
}


/**
 * 如果再想加入其它车(比如bicycle),那么只要继承Car接口,尽管添加子类即可
 * 而不需要再去改工厂类(Factory)
 */
class Factory{
    public static Car getInstance(String type){
        Car c = null;
        try {
            c = (Car)Class.forName("com.dahai."+type).newInstance();
        } catch (InstantiationException e) {
            e.printStackTrace();
        } catch (IllegalAccessException e) {
            e.printStackTrace();
        } catch (ClassNotFoundException e) {
            e.printStackTrace();
        }
        return c;
    }
}

public class SimpleFactoryDemo{
    public static void main(String[] args) {
        Car c = Factory.getInstance("Ford");
        //Car c = Factory.getInstance("车");
        //此处做一个判断,就是防止如果输入的参数,在调用方法的时候
        //没有相关的类,这样就会报异常,所以做一个判断
        if(c!=null){
            c.run();
            c.stop();
        }else{
            System.out.println("出错了");
        }
    }
}

interface Car{
	public abstract void run();
	public abstract void stop();
}

class Beaz implements Car{
	public void run(){
		System.out.println("Beaz开车了");
	}
	public void stop(){
		System.out.println("Beaz停车了");
	}
}

class Ford implements Car{
	public void run(){
		System.out.println("Ford开车了");
	}
	public void stop(){
		System.out.println("Ford停车了");
	}
}


/**
 * 如果再想加入其它车(比如bicycle),那么只要继承Car接口,尽管添加子类即可
 * 而不需要再去改工厂类(Factory)
 */
class Factory{
	public static Car getInstance(String type){
		Car c = null;
		try {
			c = (Car)Class.forName("com.dahai."+type).newInstance();
		} catch (InstantiationException e) {
			e.printStackTrace();
		} catch (IllegalAccessException e) {
			e.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}
		return c;
	}
}

public class SimpleFactoryDemo{
	public static void main(String[] args) {
		Car c = Factory.getInstance("Ford");
		//Car c = Factory.getInstance("车");
		//此处做一个判断,就是防止如果输入的参数,在调用方法的时候
		//没有相关的类,这样就会报异常,所以做一个判断
		if(c!=null){
			c.run();
			c.stop();
		}else{
			System.out.println("出错了");
		}
	}
}

转载自http://singlewolf.iteye.com