皮一下很開心

上代碼

package com.nice;



/**
 * @author nice
 */

 class Gril{

     private volatile static  Gril gril;
    
     /**
       *這裏的參數名BOY應該是boy，因爲之前寫的是final類型忘了改回去
       */
     private static    Boy  BOY ;

     static {
         BOY = Boy.getBoy();
     }

     private Gril() {
         System.out.println("女朋友只能有一個，是私有的");
     }

    /**
     * 獲得女朋友
     * @return Gril實體類
     */
    public static Gril getGril() {
         if (gril == null) {
             synchronized (Gril.class) {
                 gril = new Gril();
             }
         }
         else {
             throw new RuntimeException("您的男朋友已出軌");
         }
         return gril;
     }

    /**
     * 想男朋友了(遞歸引用，無限循環) 當然這裏用wait notify會更好
     */
    public static   void thinkBoy() {
         System.out.println("我想我的男朋友了");
         try {
             Thread.sleep(520);
         } catch (InterruptedException e) {
             e.printStackTrace();
         }
        // Boy boy = Boy.getBoy();
         BOY.thinkGril();
     }


}

class Boy{

    private volatile static  Boy boy;

    private static    Gril  GRIL ;

    static {
        GRIL = Gril.getGril();
    }

    private Boy() {
        System.out.println("男朋友只能有一個，是私有的");
    }

    /**
     * 獲得男朋友
     * @return Boy實體類
     */
    public static Boy getBoy() {
        if (boy == null) {
            synchronized (Gril.class) {
                boy = new Boy();
            }
        } else {
            throw new RuntimeException("您的女朋友已出軌");
        }
        return boy;
    }

    public static   void thinkGril() {
        System.out.println("我想我的女朋友了");
        try {
            Thread.sleep(520);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
//        Gril gril = Gril.getGril();
        GRIL.thinkBoy();
    }


}


public class LoveTest {

     public static void main(String[] args) {
         Boy boy = Boy.getBoy();
         boy.thinkGril();
     }

}

啊哈哈哈哈哈哈