java 驼峰和下划线互转

public class Tool{ PRivate static Pattern linePattern = Pattern.compile(“_(/w)”); /*下划线转驼峰/ public static String lineToHump(String str){ str = str.toLowerCase(); Matcher matcher = linePattern.matcher(str); StringBuffer sb = new StringBuffer(); while(matcher.find()){ matcher.appendReplacement(sb, matcher.group(1).toUpperCase()); } matcher.appendTail(sb); return sb.toString(); } /*驼峰转下划线(简单写法，效率低于{@link #humpToLine2(String)})/ public static String humpToLine(String str){ return str.replaceAll(“[A-Z]”, “_$0”).toLowerCase(); } private static Pattern humpPattern = Pattern.compile(“[A-Z]”); /*驼峰转下划线,效率比上面高/ public static String humpToLine2(String str){ Matcher matcher = humpPattern.matcher(str); StringBuffer sb = new StringBuffer(); while(matcher.find()){ matcher.appendReplacement(sb, “_”+matcher.group(0).toLowerCase()); } matcher.appendTail(sb); return sb.toString(); } public static void main(String[] args) { String lineToHump = lineToHump(“f_parent_no_leader”); System.out.println(lineToHump);//fParentNoLeader System.out.println(humpToLine(lineToHump));//f_parent_no_leader System.out.println(humpToLine2(lineToHump));//f_parent_no_leader } }

//使用正则表达式