Map <Integer, Point2D.Double> hm = new HashMap<Integer, Point2D>(); hm.put(1, new Point2D.Double(50, 50));
Map<String, String> emptyMap = Map.of(); Map<String, String> singletonMap = Map.of("key1", "value"); Map<String, String> map = Map.of("key1","value1", "key2", "value2");