Sorting HashMap by values [duplicate]

Answer 1

public static TreeMap sortMap(HashMap passedMap, String byParam) {
    if(byParam.trim().toLowerCase().equalsIgnoreCase("byValue")) {
        // Altering the (key, value) -> (value, key)
        HashMap newMap =  new HashMap();
        for (Map.Entry entry : passedMap.entrySet()) {
            newMap.put(entry.getValue(), entry.getKey());
        }
        return new TreeMap(newMap);
    }
    return new TreeMap(passedMap);
}