Java Utililty Methods String Lower Case

List of utility methods to do String Lower Case

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Description

The list of methods to do String Lower Case are organized into topic(s).

Method

StringtoLowerCase(String source)
This method returns the lower case version of the source string. 
String returnValue = "";
if (isSet(source)) {
    returnValue = source.toLowerCase();
return returnValue;
StringtoLowerCase(String str)
cast a string a lower case String, is faster than the String.toLowerCase, if all Character are already Low Case 
int len = str.length();
char c;
for (int i = 0; i < len; i++) {
    c = str.charAt(i);
    if (!((c >= 'a' && c <= 'z') || (c >= '0' && c <= '9'))) {
        return str.toLowerCase();
return str;
StringtoLowerCase(String str)
to Lower Case 
if (str == null) {
    return null;
} else {
    str = str.trim();
    if (str.length() == 0) {
        return null;
    } else {
        return str.toLowerCase();
...
StringtoLowerCase(String str)
to Lower Case 
StringBuffer buffer = new StringBuffer(str);
for (int i = 0; i < buffer.length(); i++) {
    char c = buffer.charAt(i);
    buffer.setCharAt(i, Character.toLowerCase(c));
return buffer.toString();
StringtoLowerCase(String str)
to Lower Case 
String newStr = convertBasicLatinToLower(str);
if (newStr == null) {
    return str.toLowerCase();
return newStr;
StringtoLowerCase(String str)
Non-localized version, be careful 
if (str != null) {
    return str.toLowerCase();
return null;
StringtoLowerCase(String str)
to Lower Case 
if (str == null) {
    return null;
return str.toLowerCase();
StringtoLowerCase(String string)
A locale independent version of toLowerCase. 
boolean changed = false;
char[] chars = string.toCharArray();
for (int i = 0; i != chars.length; i++) {
    char ch = chars[i];
    if ('A' <= ch && 'Z' >= ch) {
        changed = true;
        chars[i] = (char) (ch - 'A' + 'a');
if (changed) {
    return new String(chars);
return string;
StringtoLowerCase(String string)
to Lower Case 
if (isEmpty(string)) {
    return string;
return string.toLowerCase();
StringtoLowerCase(String text)
to Lower Case 
if (text != null) {
    int len = text.length();
    if (len > 0) {
        char[] buf = new char[len];
        for (int i = 0; i < len; i++) {
            buf[i] = Character.toLowerCase(text.charAt(i));
        text = new String(buf);
...