java下划线与驼峰命名转换

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下划线与驼峰命名转换：

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);// fParentNoLeaderSystem.out.println(humpToLine(lineToHump));// f_parent_no_leaderSystem.out.println(humpToLine2(lineToHump));// f_parent_no_leader}
}

不纠结""_"+matcher.group(0).toLowerCase()"的话，humpToLine2效率会比humpToLine高一些，看String#replaceAll方法源码即可。

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