简单工厂模式之共享单车

简单工厂模式:

打开支付宝扫一扫 ，对着共享单车的二维码 ，就可以打开共享单车

用代码来展示就是:

public enum BikeCompany {
	OFO,//ofo
	HELLOBIKE//哈罗单车
}

//共享单车都有各自的开锁声音
public interface Bike {
	public void unlock();
}

//哈罗单车
public class HelloBike implements Bike {

	@Override
	public void unlock() {
		// TODO Auto-generated method stub
		System.out.println("hello bike");
	}
	
}

//小黄车
public class OFO implements Bike{

	@Override
	public void unlock() {
		// TODO Auto-generated method stub
		System.out.println("滴滴滴");
	}

}

/**
 * 支付宝扫一扫
 *  工厂
 * 
 */
public class AlipayRichScan {

	public static Bike getBike(BikeCompany bikeCompany){
		switch (bikeCompany) {
			case OFO:
				return new OFO();
			case HELLOBIKE:
				return new HelloBike();
			default:
				return null;
		}
	}
}

运行一下程序

public class BikeTest {

	public static void main(String[] args) {
		Bike bike = AlipayRichScan.getBike(BikeCompany.HELLOBIKE);
		bike.unlock();//开锁声音
	}
}

输出结果:

hello bike

UML类图:

如果摩拜单车也加入了支付宝,那得修改不少东西哦... 比如enum(BikeCompany)增加摩拜单车公司,

AlipayRichScan要增加case，有没有更好的办法呢?