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How to use java split method?

Nov 02, 2020 pm 04:09 PM
java split

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。

How to use java split method?

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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]])
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  • 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]);
     }

}
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程序结果:

The
rain
in
Spain
falls
mainly
in
the
plain.
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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);
}
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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(".");
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改为

String[] names = value.split("//.");
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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]);
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  • 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]);
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  • 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]);
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  • 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]);
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  • 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]);
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  • 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]);
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  • 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]);
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  • 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]);
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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]);
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例:

 String address = new String("192.168.13.240");
        String[] str = address.split("\\.");
        for(String s : str){
            System.out.println(s);
        }
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输出格式:

192
168
13
240
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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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