TreeSet headSet() method in java code example

Example 1: TreeSet headSet() method in java

import java.util.Iterator;
import java.util.TreeSet;
public class TreeSetHeadSetMethodExample
{
   public static void main(String[] args)
   {
      TreeSet ts = new TreeSet();
      TreeSet hs = new TreeSet();
      ts.add(1);
      ts.add(2);
      ts.add(3);
      ts.add(4);
      ts.add(5);
      ts.add(6);
      // get values for 5 inclusive true
      hs = (TreeSet)ts.headSet(5, true);
      // create iterator
      Iterator iterate = hs.iterator();
      System.out.println("TreeSet data for '5' inclusive TRUE: ");
      while(iterate.hasNext())
      {
         System.out.println(iterate.next() + " ");
      }
      // get values for 5 inclusive false
      hs = (TreeSet)ts.headSet(5, false);
      iterate = hs.iterator();
      System.out.println("TreeSet data for '5' inclusive FALSE: ");
      while(iterate.hasNext())
      {
         System.out.println(iterate.next() + " ");
      }
   }
}

Example 2: TreeSet headSet(E toElement) method in java

import java.util.Iterator;
import java.util.TreeSet;
public class TreeSetHeadSetEToElementMethodExample
{
   public static void main(String[] args)
   {
      TreeSet ts = new TreeSet();
      TreeSet hs = new TreeSet();
      ts.add(1);
      ts.add(2);
      ts.add(3);
      ts.add(4);
      ts.add(5);
      ts.add(6);
      // get values less than 5
      hs = (TreeSet)ts.headSet(5);
      // create iterator
      Iterator iterate = hs.iterator();
      System.out.println("TreeSet data: ");
      while(iterate.hasNext())
      {
         System.out.println(iterate.next() + " ");
      }
   }
}