What will be the output of the following Java code snippet?

public class Demo
{
  public static void main(String[] args)
  {
		Map sampleMap = new TreeMap();
		sampleMap.put(1, null); 
		sampleMap.put(5, null); 
		sampleMap.put(3, null); 
		sampleMap.put(2, null); 
		sampleMap.put(4, null); 
 
       System.out.println(sampleMap);
   }
}