Java Utililty Methods Map to String

LinkedList<String> pairs = new LinkedList<String>();
ArrayList<String> keyList = new ArrayList<String>(map.keySet());
Collections.sort(keyList);
for (String s : keyList) {
    Object value = map.get(s);
    String valueStr = toString(value);
    pairs.add(s + ": " + valueStr);
return "{" + join(", ", pairs.toArray()) + "}";

StringBuilder criteriaMapStr = new StringBuilder();
if ((null == criteria) || (criteria.isEmpty())) {
    criteriaMapStr.append("[]");
} else {
    Iterator<Entry<String, String>> iterator = criteria.entrySet().iterator();
    Entry<String, String> entry;
    criteriaMapStr.append("[");
    while (iterator.hasNext()) {
...

String result = "";
Iterator<String> keySetIterator = map.keySet().iterator();
while (keySetIterator.hasNext()) {
    String key = keySetIterator.next();
    result += "|" + key + ":" + map.get(key);
return result;

StringBuilder stringBuilder = new StringBuilder();
if (null != map && !map.isEmpty()) {
    List<String> lst = new ArrayList<>(map.keySet());
    for (String key : lst) {
        stringBuilder.append(key + "=" + map.get(key));
        if (!key.equals(lst.get(lst.size() - 1))) {
            stringBuilder.append("&");
return stringBuilder.toString();

String ret = "";
for (String key : map.keySet()) {
    ret += key + "=" + map.get(key) + "; ";
return ret;

StringBuilder sb = new StringBuilder();
sb.append("[");
if (map != null && map.size() > 0) {
    int i = 0;
    for (Map.Entry<String, String> entry : map.entrySet()) {
        if (i + 1 == map.size()) {
            sb.append(entry.getKey()).append("=").append(entry.getValue());
        } else {
...

StringBuffer buf = new StringBuffer();
for (String key : map.keySet()) {
    buf.append(key).append('=');
    if (map.containsKey(key)) {
        buf.append(map.get(key));
    buf.append("\n");
return buf.toString();

StringBuilder stringBuilder = new StringBuilder();
for (String key : map.keySet()) {
    if (stringBuilder.length() > 0) {
        stringBuilder.append("&");
    String value = map.get(key);
    stringBuilder.append(((key != null) ? key : ""));
    if (value != null) {
...

StringBuilder sb = new StringBuilder().append('[');
for (Map.Entry<String, String[]> entry : parameterMap.entrySet()) {
    sb.append(entry.getKey()).append(" -> ");
    String[] value = entry.getValue();
    if (value != null) {
        sb.append("(");
        appendTo(sb, Arrays.asList(value), ",");
        sb.append(")");
...

if (map.size() == 0)
    return "";
Iterator iterator = map.keySet().iterator();
String key = (String) iterator.next();
StringBuilder stringBuilder = new StringBuilder();
stringBuilder.append(key);
stringBuilder.append(":");
stringBuilder.append(map.get(key));
...