Table of Contents
String字符串用逗号隔开
1.如果我们的需求是要让分隔符号可以兼容中英文逗号
2.如果我们的需求是取到第一个逗号前面的字符串
以逗号为分割符拼接字符串的技巧
实现代码如下所示
Home Java javaTutorial How to implement String strings separated by commas in Java

How to implement String strings separated by commas in Java

May 04, 2023 pm 10:49 PM
java string

String字符串用逗号隔开

在Java中,有两个方法可以用逗号把String分开

一个是

public String[] split(String regex) {
        return split(regex, 0);
    }
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另一个是

public String[] split(String regex, int limit) {
        /* fastpath if the regex is a
         (1)one-char String and this character is not one of the
            RegEx's meta characters ".$|()[{^?*+\\", or
         (2)two-char String and the first char is the backslash and
            the second is not the ascii digit or ascii letter.
         */
        char ch = 0;
        if (((regex.value.length == 1 &&
             ".$|()[{^?*+\\".indexOf(ch = regex.charAt(0)) == -1) ||
             (regex.length() == 2 &&
              regex.charAt(0) == '\\' &&
              (((ch = regex.charAt(1))-&#39;0&#39;)|(&#39;9&#39;-ch)) < 0 &&
              ((ch-&#39;a&#39;)|(&#39;z&#39;-ch)) < 0 &&
              ((ch-&#39;A&#39;)|(&#39;Z&#39;-ch)) < 0)) &&
            (ch < Character.MIN_HIGH_SURROGATE ||
             ch > Character.MAX_LOW_SURROGATE))
        {
            int off = 0;
            int next = 0;
            boolean limited = limit > 0;
            ArrayList<String> list = new ArrayList<>();
            while ((next = indexOf(ch, off)) != -1) {
                if (!limited || list.size() < limit - 1) {
                    list.add(substring(off, next));
                    off = next + 1;
                } else {    // last one
                    //assert (list.size() == limit - 1);
                    list.add(substring(off, value.length));
                    off = value.length;
                    break;
                }
            }
            // If no match was found, return this
            if (off == 0)
                return new String[]{this};
            // Add remaining segment
            if (!limited || list.size() < limit)
                list.add(substring(off, value.length));
            // Construct result
            int resultSize = list.size();
            if (limit == 0) {
                while (resultSize > 0 && list.get(resultSize - 1).length() == 0) {
                    resultSize--;
                }
            }
            String[] result = new String[resultSize];
            return list.subList(0, resultSize).toArray(result);
        }
        return Pattern.compile(regex).split(this, limit);
    }
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1.如果我们的需求是要让分隔符号可以兼容中英文逗号

可以用

split(String regex)
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比如下面的例子

How to implement String strings separated by commas in Java

2.如果我们的需求是取到第一个逗号前面的字符串

适合用

split(String regex, int limit)
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How to implement String strings separated by commas in Java

以逗号为分割符拼接字符串的技巧

答:

不用那么多if判断,让人思维混乱,直接到最后使用deleteCharAt方法去除最后一个逗号即可。

实现代码如下所示

StringBuffer sb = new StringBuffer();
for (String str: list) {
sb.append(str).append(",");
}
String keywordStr = sb.deleteCharAt(sb.length() - 1).toString();
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