Java example on Tree Map

       public class JavaTreeMapExample
   {
     public static void main(String[] args)
     {
      
       //create object of TreeMap
       TreeMap treeMap = new TreeMap();
      
       /*
       Add key value pair to TreeMap using,
       Object put(Object key, Object value) method of Java TreeMap class,
       where key and value both are objects
       put method returns Object which is either the value previously tied
       to the key or null if no value mapped to the key.
       */
      
       treeMap.put("One", new Integer(1));
       treeMap.put("Two", new Integer(2));
      
       /*
       Please note that put method accepts Objects. Java Primitive values CAN NOT
       be added directly to TreeMap. It must be converted to corrosponding
       wrapper class first.
       */
      
       //retrieve value using Object get(Object key) method of Java TreeMap class
       Object obj = treeMap.get("Two");
       System.out.println(obj);
      
       /*
       Please note that the return type of get method is an Object. The value must
       be casted to the original class.
       */
      
     }
  }