public static <K,V>Map<K,V> of(K k1,V v1){
  Map map=of();
  map.put(k1,v1);
  return map;
}

public static < K , V > Map < K , V > of ( K k1 , V v1 ) { Map map = of ( ) ; map . put ( k1 , v1 ) ; return map ; }
returns map containing a single entry .
