設計模式之 女朋友與情人節

如何創建一個女朋友

@2017-02-14
在第N個情人節，終於可以學以致用，用代碼創建一個Girlfriend過節
語言選用Java，設計模式用工廠模式

import org.apache.log4j.Logger;

/**
 * Created by Jianjie Wang on 2017/2/14.
 */
public class GirlfriendTest {

    private static Logger LOG = Logger.getLogger(GirlfriendTest.class);

    private static Double WU_MAO_QIAN = 0.5;

    @org.junit.Test
    public void newGirlfriendTest() {
        Girlfriend myGirlfriend = null;
        try {
            System.out.println("Start new a girlfriend...");
            Double money = WU_MAO_QIAN;
            myGirlfriend = GirlfriendFactory.createGirlfriend(money);
        } catch (MoneyNotEnoughException e) {
            // FIXME by wangjj: 2017/2/14
            System.err.println("Failed: Too yong, too simple:)");
            System.exit(-1);
        }
        myGirlfriend.enjoyValentineDay();
    }

    static class GirlfriendFactory {

        public static Girlfriend createGirlfriend(Double money) throws MoneyNotEnoughException {
            if (money < Double.MAX_VALUE) throw new MoneyNotEnoughException();
            return new Girlfriend();
        }
    }

    static class Girlfriend {

        public void enjoyValentineDay() {
            System.out.println("Think too much:)");
        }
    }

    static class MoneyNotEnoughException extends Exception {
    }
}

運行結果

參考

女朋友段子的設計模式