Java中split主要用于分隔字符串,可以根据匹配给定的正则表达式来拆分字符串;语法格式“String.split(String regex, int limit)”,参数regex指定正则表达式分隔符,limit指定分割的份数。
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split 方法
将一个字符串分割为子字符串,然后将结果作为字符串数组返回。
stringObj.split([regex,[limit]])
stringObj:必选项。要被分解的 String 对象或文字。该对象不会被 split 方法修改。
regex:可选项。字符串或 正则表达式 对象,它标识了分隔字符串时使用的是一个还是多个字符。如果忽略该选项,返回包含整个字符串的单一元素数组。
limit:可选项。该值用来限制返回数组中的元素个数。
说明:
split 方法的结果是一个字符串数组,在 stingObj 中每个出现 separator 的位置都要进行分解。separator 不作为任何数组元素的部分返回。
举例:
public class SplitDemo { public static String[] ss = new String[20]; public SplitDemo() { String s = "The rain in Spain falls mainly in the plain."; // 在每个空格字符处进行分解。 ss = s.split(" "); } public static void main(String[] args) { SplitDemo demo = new SplitDemo(); for (int i = 0; i < ss.length; i++) System.out.println(ss[i]); } }
程序结果:
The rain in Spain falls mainly in the plain.
public string[] split(string regex)
这里的参数的名称是 regex ,也就是 regular expression (正则表达式)。这个参数并不是一个简单的分割用的字符,而是一个正则表达式
public string[] split(string regex, int limit) { return pattern.compile(regex).split(this, limit); }
split 的实现直接调用的 matcher 类的 split 的方法。读者已经知道,“ . ”在正则表达式中有特殊的含义,因此我们使用的时候必须进行转义。
只要将
String[] names = value.split(".");
改为
String[] names = value.split("//.");
就可以了。
在java.lang包中有String.split()方法,返回是一个数组
特殊情况有 * ^ : | . \
一、单个符号作为分隔符
- String address="上海\上海市|闵行区\吴中路";
String[] splitAddress=address.split("\\"); System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
- String address="上海|上海市|闵行区|吴中路";
String[] splitAddress=address.split("\\|"); //如果以竖线为分隔符,则split的时候需要加上两个斜杠【\\】进行转义 System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
- String address="上海*上海市*闵行区*吴中路";
String[] splitAddress=address.split("\\*"); System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
- String address="上海:上海市:闵行区:吴中路";
String[] splitAddress=address.split("\\:"); System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
- String address="上海.上海市.闵行区.吴中路";
String[] splitAddress=address.split("\\."); System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
- String address="上海^上海市^闵行区^吴中路";
String[] splitAddress=address.split("\\^"); System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
- String address="上海@上海市@闵行区@吴中路";
String[] splitAddress=address.split("@"); System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
- String address="上海,上海市,闵行区,吴中路";
String[] splitAddress=address.split(","); System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
二、多个符号作为分隔符
String address="上海^上海市@闵行区#吴中路";
String[] splitAddress=address.split("\\^|@|#"); System.out.println(splitAddress[0]+splitAddress[1]+splitAddress[2]+splitAddress[3]);
例:
String address = new String("192.168.13.240"); String[] str = address.split("\\."); for(String s : str){ System.out.println(s); }
输出格式:
192 168 13 240
总结:(1)split表达式,其实就是一个正则表达式。* ^ | 等符号在正则表达式中属于一种有特殊含义的字符,如果使用此种字符作为分隔符,必须使用转义符即\\加以转义。
(2)如果使用多个分隔符则需要借助 | 符号,如二所示,但需要转义符的仍然要加上分隔符进行处理
更多编程相关知识,请访问:编程教学!!
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