sdk/src/com/socialize/oauth/signpost/http/HttpParameters.java
public String getAsQueryString(Object key) {
        StringBuilder sb = new StringBuilder();
        key = OAuth.percentEncode((String) key);
        Set<String> values = wrappedMap.get(key);
        if (values == null) {
            return key + "=";
        }
        Iterator<String> iter = values.iterator();
        while (iter.hasNext()) {
            sb.append(key + "=" + iter.next());
            if (iter.hasNext()) {
                sb.append("&");
            }
        }
        return sb.toString();
    }
public String getAsQueryString(Object key) {
        StringBuilder sb = new StringBuilder();
        key = OAuth.percentEncode((String) key);
        Set<String> values = wrappedMap.get(key);
        if (values == null) {
            return key + "=";
        }
        Iterator<String> iter = values.iterator();
        while (iter.hasNext()) {
            sb.append(key + "=" + iter.next());
            if (iter.hasNext()) {
                sb.append("&");
            }
        }
        return sb.toString();
    }
Concatenates all values for the given key to a list of key/value pairs
suitable for use in a URL query string.

@param key
the parameter name
@return the query string