TreeSet ceiling() method in java

TreeSet ceiling() method for NullPointerException.
import java.util.TreeSet;
public class TreeSetCeilingMethodExample
{
   public static void main(String[] args)
   {
      try
      {
         TreeSet<Integer> ts = new TreeSet<Integer>();
         ts.add(50);
         ts.add(60);
         ts.add(70);
         ts.add(80);
         System.out.println("TreeSet values: " + ts);
         // get ceiling value for null using ceiling() method
         System.out.println("compare with null value: ");
         int value = ts.ceiling(null);
         // print the ceiling value
         System.out.println("Ceiling value for null: " + value);
      }
      catch(NullPointerException ex)
      {
         System.out.println("Exception: " + ex);
      }
   }
}

import java.util.TreeSet;
public class TreeSetCeilingMethodExample
{
   public static void main(String[] args)
   {
      try
      {
         TreeSet<Integer> ts = new TreeSet<Integer>();
         ts.add(50);
         ts.add(60);
         ts.add(70);
         ts.add(80);
         System.out.println("TreeSet values: " + ts);
         // get ceiling value for 65 using ceiling() method
         int value = ts.ceiling(65);
         // print the ceiling value
         System.out.println("Ceiling value for 65: " + value);
      }
      catch(NullPointerException ex)
      {
         System.out.println("Exception: " + ex);
      }
   }
}