java design pattern simple factory pattern

Take purchasing a phone card as an example to illustrate the simple factory pattern

public interface Card {
	
	public void buyTelCard();
	
}

public class MobileCard implements Card {

	@Override
	public void buyTelCard() {
		System.out.println("购买移动卡");
	}

}

public class UnicomCard implements Card {

	@Override
	public void buyTelCard() {
		System.out.println("购买联通卡");
	}

}

public class CardFactory {

	public Card buyCard(String styleName) {
		if (styleName.toLowerCase().equals("mobile")) {
			return new MobileCard();
		} else if (styleName.toLowerCase().equals("unicom")) {
			return new UnicomCard();
		}
		return null;
	}

}/**
 * 
 *  简单工厂模式（Simple Factory Pattern）
 *
 */
public class Test {
	
	public static void main(String[] args) {
		CardFactory factory=new CardFactory();
		factory.buyCard("mobile").buyTelCard();
	}
}

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