Java Hashmap: How to get key from value?

Question

If I have the value \"foo\", and a HashMap ftw for which ftw.containsValue(\"foo\") returns true, how can I

Answer 1

public static String getKey(Map mapref, String value) {
    String key = "";
    for (Map.Entry map : mapref.entrySet()) {
        if (map.getValue().toString().equals(value)) {
            key = map.getKey();
        }
    }
    return key;
}