简单工厂模式

缺点： 不符合开闭原则

工厂类

public class SimpleCarFactory {
	public static <T extends Car> T createCar(Class<T> c) {
		Car car = null;

		try {
			car = (Car) Class.forName(c.getName()).newInstance();
		} catch (Exception e) {
			// Handle exception...
		}

		return (T) car;
	}
}

客户端代码

private static void testSimpleFactory() {
	Car audi = SimpleCarFactory.createCar(Audi.class);
	audi.showDes();
	audi.start();
	audi.showCurrentSpeed();
	audi.stop();

	Car bmw = SimpleCarFactory.createCar(BMW.class);
	bmw.showDes();
	bmw.start();
	bmw.showCurrentSpeed();
	bmw.stop();

	Car benz = SimpleCarFactory.createCar(Benz.class);
	benz.showDes();
	benz.start();
	benz.showCurrentSpeed();
	benz.stop();
}

运行结果：

引用

I'm Audi
Audi started...
180
Audi stoped...
I'm BMW
BMW started...
200
BMW stoped...
I'm Benz
Benz started...
210
Benz stoped...