Java字符串驼峰与下换线格式转换如何实现

下面是自己写的三个方法,直接类名.方法即可调用,注意此处未做异常处理.

1.下划线转驼峰 lowerLineToHump()

2.首字母大写 capitalizeTheFirstLetter()

3.驼峰转下划线 humpToLowerLine()

package yang.demo.justwrite;import java.util.regex.Matcher;import java.util.regex.Pattern;/** * @Description: 变量名转换 * @Class: VariableNameConversion * @Author: Yiang37 * @Date: 2020/11/3 15:23 * @Version: 1.0 */public class VariableNameConversion { private static Pattern humpPattern = Pattern.compile('[A-Z]'); public static void main(String[] args) { System.out.println(lowerLineToHump('NAME_AND_addREsS')); System.out.println(capitalizeTheFirstLetter('nAMe')); System.out.println(humpToLowerLine('nameAndAddress')); } /** * @Description: 下划线格式 -> 驼峰 大小写均可 * <p> * NAME_AND_ADDRESS -> nameAndAddress * @Author: Yiang37 * @Date: 2020/11/03 15:26:02 * @Version: 1.0 * @method: lowerLineAndUppercaseToHump() * @param: [Big_] * @return: java.lang.String */ public static String lowerLineToHump(String lowerLineAndUppercaseStr) { //拆分成数组 String[] eachStr = lowerLineAndUppercaseStr.split('_'); StringBuilder resStr = new StringBuilder(); String firstStr = ''; String tempStr = ''; for (int i = 0; i < eachStr.length; i++) { //第一个数组全部小写 if (i == 0) {firstStr = eachStr[0].toLowerCase();resStr.append(firstStr); } else {//以后的数组首字母大写tempStr = capitalizeTheFirstLetter(eachStr[i]);resStr.append(tempStr); } } return resStr.toString(); } /** * @Description: 任意字符串 -> 首字母大写 * NAME -> Name * name -> Name * NaMe -> Name * @Author: Yiang37 * @Date: 2020/11/03 16:50:16 * @Version: 1.0 * @method: capitalizeTheFirstLetter() * @param: [str] * @return: java.lang.String */ public static String capitalizeTheFirstLetter(String str) { char firstChar = str.toUpperCase().charAt(0); String nextStr = str.toLowerCase().substring(1); return firstChar + nextStr; } /** * @Description: 驼峰 -> 下划线格式 默认小写,存在第二个形参且为true时大写. * @Author: Yiang37 * @Date: 2020/11/03 17:10:25 * @Version: 1.0 * @method: humpToLowerLine() * @param: [humpStr, UppercaseZeroAndLowercaseOne] * @return: java.lang.String */ public static String humpToLowerLine(String humpStr, boolean ... defaultUppercaseAndTrueLowercase) { Matcher matcher = humpPattern.matcher(humpStr); StringBuffer sb = new StringBuffer(); while (matcher.find()) { matcher.appendReplacement(sb, '_' + matcher.group(0).toLowerCase()); } matcher.appendTail(sb); //如果第二个形参为true 转为大写 if (defaultUppercaseAndTrueLowercase.length>=1 && defaultUppercaseAndTrueLowercase[0]){ return sb.toString().toUpperCase(); } return sb.toString(); }}

输出结果

nameAndAddressNamename_and_address

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