Java Utililty Methods String Split by Space

List elements = new ArrayList();
StringBuffer buffer = new StringBuffer();
char[] chars = text.toCharArray();
for (int i = 0; i < chars.length; i++) {
    if (Character.isWhitespace(chars[i])) {
        if (buffer.length() > 0) {
            elements.add(buffer.toString());
            buffer = new StringBuffer();
...

List<String> result = new ArrayList<String>();
String[] items = source.split(separator);
for (String s : items) {
    if (!"".equals(s.trim())) {
        result.add(s.trim());
return result.toArray(new String[result.size()]);
...

if (input == null) {
    return Collections.emptyList();
final String[] splitValues = input.trim().split("\\s+");
return Arrays.asList(splitValues);