Java split

String split 用得太多了，但是今天編代碼時發現好幾個同事犯錯了！ 好奇心來了，順便測試了羣裏一幫人，90%出錯了，呵呵！ 有興趣你自己也測試一下吧！ 答案在文後！

1. 

String st3 = "";

System.out.println(st3.split("\\s+").length);

打印多少呢？

2. 

String st2 = " hi, Marty";

System.out.println(st2.split("\\s+").length);

2. 

String st4 = "   ";

System.out.println(st4.split("\\s+").length);

大家參考一下文檔或者文章http://shukuiyan.iteye.com/blog/1058672

split

public String[] split(String regex)

Splits this string around matches of the given regular expression.

This method works as if by invoking the two-argument split method with the given expression and a limit argument of zero. Trailing empty strings are therefore not included in the resulting array.

The string "boo:and:foo", for example, yields the following results with these expressions:

Regex	Result
:	{ "boo", "and", "foo" }
o	{ "b", "", ":and:f" }

Parameters:

regex - the delimiting regular expression

Returns:

the array of strings computed by splitting this string around matches of the given regular expression

Throws:

PatternSyntaxException - if the regular expression's syntax is invalid

Since:

1.4

See Also:

Pattern

答案： 1， 3， 0

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