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Re: [問題] 樂透不能重複問題

[ java ]18 留言, 推噓總分: +15

作者: ninteen - 發表於 2008/12/06 02:22(17年前)

1^F推yyc1217:第一次選的範圍是46個數字，第二次選的範圍是45個數字12/06 23:21

2^F推yyc1217:以此類推12/07 00:48

[問題] 如何知道java程式吃了多少記憶體

[ java ]5 留言, 推噓總分: +3

作者: gech2001 - 發表於 2008/11/25 19:39(17年前)

1^F推yyc1217:有方法可以得到當前的記憶體容量前後兩個相減11/25 20:01

[問題] Java SE6全方位學習的習題問題

[ java ]2 留言, 推噓總分: +2

作者: SeaSerene - 發表於 2008/11/13 21:45(17年前)

1^F推yyc1217:雖然extends了，但是不能直接用喔除非兩個放在一起11/13 21:58

[問題] class的data member?

[ java ]6 留言, 推噓總分: +4

作者: walm20 - 發表於 2008/10/25 22:34(17年前)

1^F→yyc1217:少資料型態~10/25 22:52

[問題] 還是不太懂多型

[ java ]18 留言, 推噓總分: +10

作者: s66449 - 發表於 2008/10/25 21:33(17年前)

2^F推yyc1217:假設你現在要寫一個動物園你有Animal類別跟許多繼承於10/25 22:38

3^F→yyc1217:Animal的其他動物類別（假設有Dog及Cat）10/25 22:40

4^F→yyc1217:現在你不知道程式傳進來的是dog還是cat10/25 22:42

6^F推yyc1217:所以你會宣告一個Animal參數用來指向任一個傳進來的物件10/25 22:45

7^F→yyc1217:但你不能宣告cat或dog參數因為他們彼此不能通過"IS-A"10/25 22:47

8^F推yyc1217:這就是多型的好處用來處理不知道會傳進什麼物件的情況下10/25 22:49

9^F→yyc1217:但你知道傳進來的都是"Animal" 就可以這樣寫10/25 22:51

16^F推yyc1217:工作上你寫的程式別人也有可能會用到10/26 15:31

17^F→yyc1217:並且未來動物的種類也有可能會增加像多個無尾熊熊貓之類10/26 15:33

18^F→yyc1217:這樣你原來的函式就不用再修改了而且每隻動物都可以用10/26 15:35

Re: [問題] 請問有多少個String物件被建立出來

[ java ]1 留言, 推噓總分: +1

作者: adrianshum - 發表於 2008/10/24 12:19(17年前)

1^F推yyc1217:看JAVA版長知識~10/24 15:02

Re: [問題] 請問有多少個String物件被建立出來

[ java ]6 留言, 推噓總分: +5

作者: adrianshum - 發表於 2008/10/23 12:41(17年前)

1^F推yyc1217:Line 3少一個"fall" 而最後一行的println不會產生10/23 14:24

3^F推yyc1217:最後一行為什麼要產生?10/23 15:59

[問題] 請問有多少個String物件被建立出來

[ java ]8 留言, 推噓總分: +4

作者: misifit - 發表於 2008/10/23 12:09(17年前)

1^F推yyc1217:1.的確是8個這是認證手冊裡的範例10/23 12:11

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