as运算符用于执行引用类型的显式类型转换。如果要转换的类型与指定的类型兼容，转换就会成功进行；如果类型不兼容，as运算符就会返回null值。如下面的代码所示，如果object引用实际上不引用string实例，把object引用转换为string就会返回null：object
o1="Some Str...
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其他好文 时间：
2014-06-06 20:23:41
阅读次数：
307
Installation of the Intel? XDK on Apple* OS X*
involves all or some of the following steps:Install the Google* Chrome*
browserUpdate Java* on your Mac...
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其他好文 时间：
2014-06-06 10:03:14
阅读次数：
490
On some occasions, especially if you are working
behind a corporate or university firewall, you may find that the Intel? XDK will
either not start or ...
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其他好文 时间：
2014-06-06 09:54:57
阅读次数：
211
As far as I know, SharedPreferences allow us to
store some simple data in a named area in our phone. Introduction to the uses of
SharedPreferences is ...
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移动开发 时间：
2014-06-05 14:07:21
阅读次数：
390
【题目】
Validate if a given string is numeric.
Some examples:
"0" => true
" 0.1 " => true
"abc" => false
"1 a" => false
"2e10" => true
Note: It is intended for the problem statement to be ambiguous. You should gather all requirements up front before imple...
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其他好文 时间：
2014-06-04 23:45:09
阅读次数：
388
24 Point game
时间限制：3000 ms | 内存限制：65535 KB
难度：5
描述
There is a game which is called 24 Point game.
In this game , you will be given some numbers. Your task is to find an expressi...
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其他好文 时间：
2014-06-04 21:06:57
阅读次数：
295
This note summarizes articles from other places
about Microsoft Windows images for OpenStack creation, along with some first
hand experience. The whol...
感觉不会再爱了，呜呜！A题原来HACK这么多！很多人跟我一样掉坑了！If there is some
choice whose description at least twice shorter than all other descriptions, or
at least twice long...
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其他好文 时间：
2014-06-02 06:33:26
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238
Y2K Accounting BugDescriptionAccounting for
Computer Machinists (ACM) has sufferred from the Y2K bug and lost some vital
data for preparing annual rep...
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其他好文 时间：
2014-06-02 00:57:42
阅读次数：
386
Description
Some strange code is sent to Da Shan High School. It's said to be the prophet's note. The note is extremely hard to understand. However, Professor Meng is so smart that he successfully ...
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其他好文 时间：
2014-06-01 09:18:38
阅读次数：
246
