Java Utililty Methods URL Query Parse

return PATTERN_AND.splitAsStream(queryString).map(s -> Arrays.copyOf(s.split("="), 2))
        .collect(Collectors.groupingBy(s -> s[0], Collectors.mapping(s -> s[1], toList())));

Map<String, String[]> map = new HashMap<String, String[]>();
if (queryString != null && !queryString.isEmpty()) {
    StringTokenizer parser = new StringTokenizer(queryString, "&?;=", true);
    String name = null;
    String value = null;
    while (parser.hasMoreTokens()) {
        String token = parser.nextToken();
        String ttoken = token.trim();
...

Map<String, String> map = new HashMap<String, String>();
if ((queryString == null) || (queryString.equals(""))) {
    return map;
String[] params = queryString.split("&");
for (String param : params) {
    try {
        String[] keyValuePair = param.split("=", 2);
...

if (queryString == null || params == null) {
    return;
if (queryString.length() > 0) {
    String token;
    int offset;
    StringTokenizer tokenizer = new StringTokenizer(queryString, "&");
    while (tokenizer.hasMoreTokens()) {
...

Multimap<String, String> result = ArrayListMultimap.create();
if (queryString == null) {
    return result;
for (String param : queryString.split("&")) {
    String pair[] = param.split("=");
    String key = URLDecoder.decode(pair[0], "UTF-8");
    String value = "";
...

if (query == null)
    return null;
Map<String, String> result = new HashMap<String, String>();
if (query != null) {
    query = URLDecoder.decode(query, "8859_1");
    String[] st = query.split("&");
    for (int i = 0; i < st.length; i++) {
        String[] av = st[i].split("=", 2);
...