Java Example on TreeSet

      public class SimpleJavaTreeSetExample
   {
     public static void main(String[] args)
     {
      
       //create object of TreeSet
       TreeSet tSet = new TreeSet();
      
       /*
       Add an Object to TreeSet using
       boolean add(Object obj) method of Java TreeSet class.
       This method adds an element to TreeSet if it is not already present in TreeSet.
       It returns true if the element was added to TreeSet, false otherwise.
       */
      
       tSet.add(new Integer("1"));
       tSet.add(new Integer("2"));
       tSet.add(new Integer("3"));
      
       /*
       Please note that add method accepts Objects. Java Primitive values CAN NOT
       be added directly to TreeSet. It must be converted to corrosponding
       wrapper class first.
       */
      
       System.out.println("TreeSet contains.." + tSet); }
   }