拆分以空格分隔的字符串 [英] Splitting a space separated string

问题描述

String numbers = "5 1 5 1";

是吗:

String [] splitNumbers = numbers.split();

或:

String [] splitNumbers = numbers.split("\s+");

寻找:["5","1","5","1"]

知道为什么 .split 行都不起作用吗?我尝试阅读有关正则表达式的答案，但一无所获.

Any idea why neither of the .split lines will work? I tried reading answers about the regex, but I'm not getting anywhere.

推荐答案

您必须使用额外的 \ 对正则表达式进行转义，因为 \ 表示转义字符:

You must escape the regex with an additional \ since \ denotes the escape character:

public static void main(String[] args) {
    String numbers = "5 1 5 1";
    String[] tokens = numbers.split("\\s+");
    for(String token:tokens){
        System.out.println(token);
    }
}

因此附加的 \ 转义了下一个 \，然后将其视为文字 \.

So the additional \ escapes the next \ which is then treated as the literal \.

当使用 \\s+ 时，字符串将被分割成多个空白字符(空格、制表符等).

When using \\s+ the String will be split on multiple whitespace characters (space, tab, etc).

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