Java Utililty Methods String Capitalize

final char[] chars = s.toCharArray();
if (chars.length > 0) {
    chars[0] = Character.toUpperCase(chars[0]);
return new String(chars);

Capitalizes a String changing the first character to title case as per Character#toTitleCase(int) .

int strLen;
if (str == null || (strLen = str.length()) == 0) {
    return str;
final int firstCodepoint = str.codePointAt(0);
final int newCodePoint = Character.toTitleCase(firstCodepoint);
if (firstCodepoint == newCodePoint) {
    return str;
...

final char firstChar = str.charAt(0);
final char newChar = Character.toUpperCase(firstChar);
if (firstChar == newChar) {
    return str;
char[] newChars = new char[str.length()];
newChars[0] = newChar;
str.getChars(1, str.length(), newChars, 1);
...

String result = null;
if (str != null) {
    if (str.length() >= 2) {
        result = str.substring(0, 1).toUpperCase() + str.substring(1).toLowerCase();
    } else {
        result = str.toUpperCase();
return result;

final char[] buffer = str.toLowerCase().replace('-', '_').toCharArray();
buffer[0] = Character.toTitleCase(buffer[0]);
return new String(buffer);

final char charAt = str.charAt(0);
return Character.toUpperCase(charAt) + str.substring(1);

Capitalizes a String changing the first letter to title case case as per Character#toUpperCase(char) .

int strLen;
if (str == null || (strLen = str.length()) == 0) {
    return str;
final char firstChar = str.charAt(0);
if (Character.isUpperCase(firstChar)) {
    return str;
return new StringBuilder(strLen).append(Character.toUpperCase(firstChar)).append(str.substring(1))
        .toString();

 StringUtils.capitalize(null)  = null StringUtils.capitalize("")    = "" StringUtils.capitalize("cat") = "Cat" StringUtils.capitalize("cAt") = "CAt" 

int strLen;
if (str == null || (strLen = str.length()) == 0) {
    return str;
final char firstChar = str.charAt(0);
if (Character.isTitleCase(firstChar)) {
    return str;
return new StringBuilder(strLen).append(Character.toTitleCase(firstChar)).append(str.substring(1))
        .toString();

if (str.length() > 1) {
    return str.substring(0, 1).toUpperCase() + str.substring(1);
} else {
    return str.toUpperCase();

int strLen;
if (str == null || (strLen = str.length()) == 0) {
    return str;
final char firstChar = str.charAt(0);
final char newChar = Character.toTitleCase(firstChar);
if (firstChar == newChar) {
    return str;
...