map inside map java code example

Example 1: java create map

Map <Integer, Point2D.Double> hm = new HashMap<Integer, Point2D>();
hm.put(1, new Point2D.Double(50, 50));

Example 2: java map declaration

Map< String,Integer> hm =  
                        new HashMap< String,Integer>(); 
       hm.put("a", new Integer(100)); 
       hm.put("b", new Integer(200)); 
       hm.put("c", new Integer(300)); 
       hm.put("d", new Integer(400));