Java Utililty Methods URL Query Build

String queryString = "";
if (parameters != null && !parameters.isEmpty()) {
    Set<Entry> entrySet = parameters.entrySet();
    for (Entry entry : entrySet) {
        try {
            String key = entry.getKey().toString();
            Object value = entry.getValue();
            List values = makeStringList(value);
...

String queryString = "";
if (parameters != null && !parameters.isEmpty()) {
    for (String key : parameters.keySet()) {
        try {
            Object value = parameters.get(key);
            if (value instanceof String) {
                queryString += key + "=" + URLEncoder.encode(value == null ? "" : value.toString(), charSet)
                        + "&";
...

StringBuilder sb = new StringBuilder();
for (Map.Entry<String, String> e : queryString.entrySet()) {
    if (sb.length() > 0) {
        sb.append('&');
    sb.append(URLEncoder.encode(e.getKey(), ENCODING_UTF_8)).append('=')
            .append(URLEncoder.encode(e.getValue(), "UTF-8"));
return sb.toString();

StringBuilder sb = new StringBuilder();
for (Map.Entry<?, ?> entry : map.entrySet()) {
    if (sb.length() > 0) {
        sb.append("&");
    sb.append(String.format("%s=%s", urlEncodeUTF8(entry.getKey().toString()),
            urlEncodeUTF8(entry.getValue().toString())));
return sb.toString();

String paramStr = "";
for (Map.Entry<String, String> entry : requestMap.entrySet()) {
    if (!paramStr.isEmpty()) {
        paramStr += "&";
    paramStr += entry.getKey() + "=" + URLEncoder.encode(entry.getValue(), "UTF-8");
return paramStr;
...