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| package com.ruben.utils;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
public class CamelCaseUtils {
private static Pattern underlinePattern = Pattern.compile("_(\\w)");
private static Pattern upperCasePattern = Pattern.compile("[A-Z]");
public static String camelCaseToLowerCaseUnderline(String value) {
if (value == null || "".equals(value.trim())) {
return null;
}
Matcher matcher = upperCasePattern.matcher(value);
StringBuffer sb = new StringBuffer();
while (matcher.find()) {
matcher.appendReplacement(sb, "_" + matcher.group(0).toLowerCase());
}
matcher.appendTail(sb);
return sb.toString();
}
public static String lowerCaseUnderlineToCamelCase(String value) {
if (value == null || "".equals(value.trim())) {
return null;
}
value = value.toLowerCase();
Matcher matcher = underlinePattern.matcher(value);
StringBuffer stringBuffer = new StringBuffer();
while (matcher.find()) {
matcher.appendReplacement(stringBuffer, matcher.group(1).toUpperCase());
}
matcher.appendTail(stringBuffer);
return stringBuffer.toString();
}
public static void main(String[] args) {
String underlineString = camelCaseToLowerCaseUnderline("youKnowWhatHeSay");
System.out.println(underlineString);
String lowerCaseString = lowerCaseUnderlineToCamelCase(underlineString);
System.out.println(lowerCaseString);
}
}
|