Java Utililty Methods String Upper Case

if (src == null) {
    return null;
} else {
    return src.toUpperCase();

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.toUpperCase();
return str;

String newStr = convertBasicLatinToUpper(str);
if (newStr == null) {
    return str.toUpperCase();
return newStr;

if (str != null) {
    return str.toUpperCase();
return null;

StringBuffer buffer = new StringBuffer(str);
for (int i = 0; i < buffer.length(); i++) {
    char c = buffer.charAt(i);
    buffer.setCharAt(i, Character.toUpperCase(c));
return buffer.toString();

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;

return Character.toString(string.charAt(0)).toUpperCase() + string.substring(1);

if (text == null) {
    return null;
} else {
    return text.toUpperCase();

if (text != null && text.length() > 0) {
    StringBuilder sb = new StringBuilder();
    for (int i = 0; i < text.length(); i++) {
        char c = text.charAt(i);
        if (i != 0 && Character.isUpperCase(c)) {
            sb.append("_");
        sb.append(Character.toUpperCase(c));
...

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.toUpperCase(text.charAt(i));
        text = new String(buf);
...