public Collection<V> values() {
        if (values == null) {
            values = new ReferenceValues<K, V>(this);
        }
        return values;
    }
public Collection<V> values() {
        if (values == null) {
            values = new ReferenceValues<K, V>(this);
        }
        return values;
    }
public Collection < V > values ( ) { if ( values == null ) { values = new ReferenceValues < K , V > ( this ) ; } return values ; }
Returns a collection view of this map's values.

@return a set view of this map's values
Returns a collection view of this map s values .