別的不說，singleton 沒答好，有點兒說不過去。

In Java, the latest Singleton pattern, use enum instead of a regular class. It's that simple.

The reasoning based on Joshua's is that serialization can cause issues. If a class implements Serializable, then after serialized and deserialized, a new instance can be created if the instance variables are not transient.

If you can answer the above, you will be guaranteed to pass the Singleton question.

Good luck.

所有跟帖： 

• 謝師祖教誨。 -吳用先生- ♂ (0 bytes) () 03/04/2009 postreply 22:09:19

• 回複：別的不說，singleton 沒答好，有點兒說不過去。 -ncpga- ♂ (158 bytes) () 03/05/2009 postreply 09:26:00

• It was a C++ interview, -吳用先生- ♂ (467 bytes) () 03/05/2009 postreply 10:44:10

• why it needs a copy ctor? why make copy constructor "protected" -戲雨飛鷹- ♀ (356 bytes) () 03/05/2009 postreply 11:50:35

• the interviewer said -吳用先生- ♂ (186 bytes) () 03/05/2009 postreply 12:31:48

• ok. -戲雨飛鷹- ♀ (0 bytes) () 03/05/2009 postreply 12:40:14

• 師祖爺呀，你的singleton說得也忒深奧了。夠俺回味好幾年得了。。 ~~~ -戲雨飛鷹- ♀ (26 bytes) () 03/05/2009 postreply 12:18:58

• 是啊是啊，也很高興飛鷹姐姐親臨指導，沒想到 -吳用先生- ♂ (48 bytes) () 03/05/2009 postreply 12:34:56

• 看似容易，其實還是有點學問的。 -mdq100- ♂ (170 bytes) () 03/05/2009 postreply 20:21:33

• 噢，謝謝。我還真沒用過serialization /deserialization -戲雨飛鷹- ♀ (762 bytes) () 03/05/2009 postreply 20:43:54

• basiaclly yes. -mdq100- ♂ (237 bytes) () 03/05/2009 postreply 20:55:48

• Thanks, 100... -戲雨飛鷹- ♀ (0 bytes) () 03/05/2009 postreply 20:58:13

• nonsense, 又不用你發明singleton. 知道singleton是什麽意思,會COPY$PASTE 就行. -bluemont- ♂ (0 bytes) () 03/05/2009 postreply 19:28:02

• 這麽複雜？那COPY$PASTE是８是很難？哈哈。。 -戲雨飛鷹- ♀ (69 bytes) () 03/05/2009 postreply 20:00:33

• 隻要不謾罵，歡迎交流。換馬甲也沒關係。 -mdq100- ♂ (0 bytes) () 03/05/2009 postreply 20:17:12