Topic: 这样的数组有什么区别? |
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1.这样的数组有什么区别? | Copy to clipboard |
Posted by: wu_Java1981 Posted on: 2006-07-31 14:45 请教一下,下面两个数组定义有什么区别? String[] str1 = {'1','2','3','4',}; //这个有个逗号 String[] str2 = {'1','2','3','4'}; //这个没有逗号 这样定义的数组长度都一样,都本人不知道有什么区别或说本人认为str1的定义是错的。 请指教,谢谢! |
2.Re:这样的数组有什么区别? [Re: wu_Java1981] | Copy to clipboard |
Posted by: why Posted on: 2006-07-31 19:49 沒区别 但都是错的: String[] str2 = {"1","2","3","4"}; char[] str2 = {'1','2','3','4'}; |
3.Re:这样的数组有什么区别? [Re: wu_Java1981] | Copy to clipboard |
Posted by: 铁针 Posted on: 2006-08-01 10:44 是把“书”上的代码照搬来的呢还是楼主自己想出来这么写的呢? |
4.Re:这样的数组有什么区别? [Re: 铁针] | Copy to clipboard |
Posted by: zcjl Posted on: 2006-08-01 10:42 奇怪,应该是不符合语法的代码,编译却不会出错,编译器的容错性真不赖啊 String[] strs = {"1", "2", "3", }; |
5.Re:这样的数组有什么区别? [Re: zcjl] | Copy to clipboard |
Posted by: why Posted on: 2006-08-01 12:29 zcjl wrote: 是符合语法的
http://java.sun.com/docs/books/jls/third_edition/html/syntax.html#18.1 |
6.Re:这样的数组有什么区别? [Re: wu_Java1981] | Copy to clipboard |
Posted by: wu_Java1981 Posted on: 2006-08-01 22:20 谢谢问题儿童。 这是我写错了,不符合语法,我只是想问问这两种写法的区别,初学者难免会出错,望谅解! |
7.Re:这样的数组有什么区别? [Re: wu_Java1981] | Copy to clipboard |
Posted by: why Posted on: 2006-08-01 23:14 wu_Java1981 wrote: 沒区别 倒想知道閣下為何會有此一問。 |
8.Re:这样的数组有什么区别? [Re: wu_Java1981] | Copy to clipboard |
Posted by: wu_Java1981 Posted on: 2006-08-03 20:36 Answer(问题儿童): String[] str1 = {"1","2","3","4",}; //这个有个逗号 String[] str2 = {"1","2","3","4"}; //这个没有逗号 有逗号的,我认为好像有些错误,我认为逗号后面还应该跟着,还没完。。。 所以就这么问了。 |
9.Re:这样的数组有什么区别? [Re: wu_Java1981] | Copy to clipboard |
Posted by: floater Posted on: 2006-08-05 05:27 This is good for quick testing. I always use this. In my case, I have a table, sometimes I care some columns, other times I care some other columns, so I am lazy to remove the last comma when I change columns. It's convenient. |
10.Re:这样的数组有什么区别? [Re: wu_Java1981] | Copy to clipboard |
Posted by: awrong Posted on: 2006-08-19 22:11 String[] str1 = {'1','2','3','4',}; 编译会出错呀,提示类型不配,一个是char,一个是String,怎么不会出错的??? 当然,不嫌麻烦你可以用valueOf()方法,将它转成String类型,如String[] str1 = {String.valueOf(1),String.valueOf(2),String.valueOf(3),String.valueOf(4)}; 哈哈,你说累不累呀。。。。。。 String[] str1 = {"1","2","3","4",}; 多一个“,”不出错,其长度还是4,但再加一个“,”,编译出错,提示语法错误,呵呵。 |
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