Java Utililty Methods String Trim Right

if (s == null) {
    return null;
if (c == null) {
    return s;
int len = s.length();
int st = 0;
...

return source.replaceAll("\\s+$", "");

return source.replaceAll("\\s+$", "");

if (src == null || src.length() <= nLen)
    return src;
char[] czSrc = src.toCharArray();
int i, j;
int n = czSrc.length;
for (i = n - 1; i >= nLen; i--) {
    if (czSrc[i] != ch)
        break;
...

int i = str.length();
while (i > 0) {
    switch (str.charAt(i - 1)) {
    case ' ':
    case '\t':
        i--;
        continue;
    break;
return str.substring(0, i);

if (!hasLength(str)) {
    return str;
StringBuilder sb = new StringBuilder(str);
while (sb.length() > 0 && Character.isWhitespace(sb.charAt(sb.length() - 1))) {
    sb.deleteCharAt(sb.length() - 1);
return sb.toString();
...

int start = str.length() - 1;
for (int i = start; i >= 0; i--) {
    char c = str.charAt(i);
    if (c != ' ' && c != '\t') {
        return i != start ? str.substring(0, i + 1) : str;
return "";
...

return rtrim(str, " ");

int index = str.length();
while (' ' == str.charAt(--index))
    ;
if (index < str.length())
    str = str.substring(0, index + 1);
return str;

return trimAt(str.length(), str);