Java中String的spilt

java 中String 的spilt方法是用于按照分割符进行分隔

1、简介 

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:

分割符      分割后的字符串

   "："           “boo” ,“and”,"foo"

2、扩展

   当我们随机的输入一段程序时

     String ip="192.163.234.345";

     String[] str=ip.split(".");

    System.out.println(str[2]);  

    我们认为会输出“345”，当是好奇怪的是：


数组月界，显然数组没有分到4个，断点调试的事后发现，还是原来的字符串，难道spilt方法无效，

于是换一个字符串

      String ip="192.163.234.345";

      ip = ip.replace(".","a");

      String[] str=ip.split("a");

      System.out.println(str[2]);