Question

将字符串转换为camelCase

例如： “user_id”改为“userId” “user_name”到“userName” “country_province_city”改为“countryProvinceCity”

如何以简单的方式做到这一点？

ps：“country_province_city”应该是“countryProvinceCity”而不是“countryprovincecity”

Answer 1

正如Fast Snail所提到的那样，只需使用String str = "user_id, user_name, user_id";，如果str = str.replaceAll("userID", "user_id");，请致电str，导致"userID, user_name, userID"现在拥有值public String toCamel(String str) { String[] splits = str.split("_"); for (int i = 1; i < splits.length; i++) { char first = Character.toUpperCase(splits.charAt(0)); if (splits[i].length() > 0) splits[i] = first + splits[i].substring(1); else splits[i] = first + ""; } String toRet = ""; for (String s : splits) toRet += s; return toRet; }

或者，更完整的方法如下

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Answer 2

我会使用循环和StringBuilder。像

这样的东西

String[] arr = { "user_id", "user_name", "country_province_city" };
for (String str : arr) {
    StringBuilder sb = new StringBuilder(str);
    int pos;
    while ((pos = sb.indexOf("_")) > -1) {
        String ch = sb.substring(pos + 1, pos + 2);
        sb.replace(pos, pos + 2, ch.toUpperCase());
    }
    System.out.printf("%s = %s%n", str, sb);
}

我得到了（要求的）

user_id = userId
user_name = userName
country_province_city = countryProvinceCity

Answer 3

这是一个非常简单的问题：

public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        String result = "";

        String input = scan.nextLine();
        for (int i = 0; i < input.length(); i++) {
            if (input.charAt(i) == '_') {
                result += input.toUpperCase().charAt(i + 1);
                i = i + 1;
            } else {
                result += input.toLowerCase().charAt(i);
            }
        }
        System.out.println(result);
    }

如果您喜欢多次这样做，我建议您使用while循环来反复重复相同的代码：

while (true) {
  //the previous code
  }

Answer 4

http://commons.apache.org/proper/commons-lang/javadocs/api-3.4/index.html

import urllib2 as ur
import re

f = ur.urlopen(u'http://www.site.co.uk/sitemap.xml')
res = f.readlines()
for d in res:
  data = re.findall('<loc>(http:\/\/.+)<\/loc>',d)
  for i in data:
    print i
    file = open("sitemapdata.txt", "a")
    file.write(i +'\n')
    file.close()

输出 countryProvinceCity

Answer 5

从另一个角度来看，上面的答案也可以使用split函数和两个loops来完成，如下所示：

String[] strings = {"user_id","user_name","country_province_city"};

for (int i = 0; i < strings.length; i++)
{
    String string = strings[i];
    String totalString = "";

    String[] divide = string.split("_");

    for(int j = 0; j < divide.length; j++)
    {
       if(j != 0)
       {
          divide[j] = "" + divide[j].toUpperCase().charAt(0) + divide[j].substring(1,divide[j].length());
       }

       totalString = totalString + divide[j];
    }
}

如果您想通过控制台显示此更改Strings，您只需在第二个循环后添加System.out.println并在第一个循环内添加for (int i = 0; i < strings.length; i++) { //The same code as the code that I put in the example above for(int j = 0; j < divide.length; j++) { //The same code as the example above } System.out.println(totalString); }，如下所示：

array

相反，如果你的目标是将它们存储到String[] store; for (int i = 0; i < strings.length; i++) { //The same code as the code that I put in the example above store = new String[divide.length]; for(int j = 0; j < divide.length; j++) { //The same code as the example above } store[j] = totalString; }中，你可以这样做：

$hide.addClass('hide').removeClass('show');
$show.removeClass('hide').addClass('show');

如果您对代码有任何疑问，请告诉我。

我希望它会对你有所帮助！

如何在Java中将“user_id”转换为“userId”？

5 个答案: