TreeMap Program - Special functions

public static void specialFunctions(String args[])
{
 TreeMap<String, Integer> tm1 = new TreeMap<String, Integer>();  
 tm1.put("banana", 20);
 tm1.put("apple", 50);
 tm1.put("melon", 40);
 tm1.put("guava", 20);
 tm1.put("cherry", 30);

 System.out.println("\nElements of tm1: " + tm1);
 Set mySet = tm1.keySet();
 System.out.println("Keys of tm1: " + mySet);

 Collection myCol = tm1.values();
 System.out.println("Values of tm1: " + myCol);

 // USING ITERATOR
 System.out.print("\nPrinting keys with Iterator: ");
 Iterator it1 = mySet.iterator();
 while(it1.hasNext())
 {
  System.out.print(it1.next() + ", ");
 } 
 // TREEMAP SORT BY VALUE
 TreeSet yourSet = new TreeSet();
 yourSet.addAll(myCol);
 System.out.println("\nTreeMap sort by value: " + yourSet);

 // COMPARING TWO TREE MAPS
 TreeMap<String, Integer> tm2 = new TreeMap<String, Integer>();  
 tm2.putAll(tm1);
 System.out.println("\nElements of tm2: " + tm2);
 if(tm1.equals(tm2))
 {
  System.out.println("tm1 and tm2 contain same elements\n");
 } 

 System.out.println("\t\tEXTRACTING TREEMAP ELEMENTS\n");

 SortedMap m1 = tm1.subMap("banana", "guava");
 System.out.println("subMap(\"banana\", \"guava\"): " + m1);

 SortedMap m2 = tm1.headMap("guava");
 System.out.println("headMap(\"guava\"): " + m2);

 SortedMap m3 = tm1.tailMap("guava");
 System.out.println("tailMap(\"guava\"): " + m3);
}