Java Utililty Methods String Upper Case

String toUpperCase(CharSequence string)
Converts to upper case independent of the current locale via Character#toUpperCase(char) which uses mapping information from the UnicodeData file.

char upperCaseChars[] = new char[string.length()];
for (int i = 0; i < string.length(); i++) {
 upperCaseChars[i] = Character.toUpperCase(string.charAt(i));
return new String(upperCaseChars);

char toUpperCase(final char c)
to Upper Case

return (char) toUpperCase((int) c);

String toUpperCase(final String s)
GWT 1.5.3 does not support Locale in String toUpperCase.

return s.toLowerCase();

String toUpperCase(final String s)
Retrieves an all-uppercase version of the provided string.

if (s == null) {
 return null;
final int length = s.length();
final char[] charArray = s.toCharArray();
for (int i = 0; i < length; i++) {
 switch (charArray[i]) {
 case 'a':
...

String toUpperCase(final String s)
Converts a string to upper case letters

return s == null ? null : s.toUpperCase();

void toUpperCase(final StringBuilder src)
Converts all of the characters in src to to upper case using the rules of the default locale.

for (int i = 0; i < src.length(); i++) {
 src.setCharAt(i, Character.toUpperCase(src.charAt(i)));

String toUpperCase(String candidate)
Wraps to UpperCase first char in candidate

if (candidate.length() >= 1)
 return Character.toUpperCase(candidate.charAt(0)) + candidate.substring(1);
return candidate;

String toUpperCase(String from)
Returns a UPPER CASE copy of the given string from or NULL if the supplied parameter is NULL.

if (from == null) {
 return null;
return from.toUpperCase();

String toUpperCase(String in)
Returns an all-uppercase representation of the String passed in, with dashes being replaced by underscores.

StringBuilder builder = new StringBuilder();
int length = in.length();
for (int i = 0; i < length; i++) {
 char c = in.charAt(i);
 if (c == '-') {
 builder.append("_");
 } else {
 builder.append(Character.toUpperCase(c));
...

String toUpperCase(String input)
returns the upper case string, is null save {Category} StringUtil {param} string(input) input: String.

String s = getNullSaveStr(input);
return s.toUpperCase();