Java Utililty Methods Map to Json

final StringBuilder sb = new StringBuilder("{");
Iterator<Map.Entry<String, Object>> itr = map.entrySet().iterator();
while (itr.hasNext()) {
    Map.Entry<String, Object> e = itr.next();
    sb.append('"').append(e.getKey()).append("\":\"").append(e.getValue().toString()).append('"');
    if (itr.hasNext())
        sb.append(", ");
return sb.append('}').toString();

StringBuilder builder = new StringBuilder(1024);
builder.append(pretty ? indent + "{\n" : "{");
int count = 0;
for (Entry<String, Object> entry : map.entrySet()) {
    final String key = entry.getKey();
    final Object val = entry.getValue();
    if (count > 0) {
        builder.append(pretty ? ",\n" : ",");
...

return null;

StringBuffer json = new StringBuffer("{");
int index = 0;
for (String key : map.keySet()) {
    if (index > 0) {
        json.append(",");
    json.append("'" + key + "':'" + map.get(key) + "'");
    index++;
...

if (map == null || map.size() == 0) {
    return null;
StringBuilder paras = new StringBuilder();
paras.append("{");
Iterator<Map.Entry<String, String>> ite = map.entrySet().iterator();
while (ite.hasNext()) {
    Map.Entry<String, String> entry = (Map.Entry<String, String>) ite.next();
...

if (map == null)
    return null;
else if (map.size() == 0)
    return "{}";
StringBuilder jsonBuilder = new StringBuilder(map.containsKey("") ? map.get("") : "");
jsonBuilder.append(JSON_OBJECT_START);
for (Map.Entry<String, String> entry : map.entrySet()) {
    String key = entry.getKey();
...

StringBuilder builder = new StringBuilder();
builder.append('{');
boolean first = true;
for (Map.Entry<String, String> entry : map.entrySet()) {
    if (first)
        first = false;
    else
        builder.append(',');
...

StringBuffer sb = new StringBuffer("{");
for (String key : map.keySet()) {
    String optionValue = map.get(key);
    if (sb.length() > 1) {
        sb.append(",");
    sb.append("\"" + key + "\"");
    sb.append(":");
...

int subIndentLevel = indentLevel + 1;
if (map == null)
    return getIndent(indentLevel) + "null";
StringBuffer sb = new StringBuffer();
boolean first = true;
Iterator<T> iter = map.keySet().iterator();
sb.append('{');
sb.append("\n");
...