TreeSet in java

import java.util.Iterator;
import java.util.Set;
import java.util.TreeSet;
 
/**
 * This class is used to show the TreeSet functionality.
 * @author w3spoint
 */
public class TreeSetTest {
	public static void main(String args[]){
		//Create TreeSet object.
		Set treeSet = new TreeSet();
 
		//Add objects to the HashSet.
		treeSet.add("Roxy");
		treeSet.add("Sunil");
		treeSet.add("Sandy");
		treeSet.add("Munish");
		treeSet.add("Pardeep");
 
		//Print the TreeSet object.
		System.out.println("TreeSet elements:");
		System.out.println(treeSet);
 
		//Print the TreeSet elements using iterator.
		Iterator iterator=treeSet.iterator();
		System.out.println("TreeSet elements using iterator:");
		while(iterator.hasNext()){  
		   System.out.println(iterator.next());  
		}  
	}
}

TreeSet elements:
[Munish, Pardeep, Roxy, Sandy, Sunil]
TreeSet elements using iterator:
Munish
Pardeep
Roxy
Sandy
Sunil

import java.util.*;  
public class TreeSetExample{  
 public static void main(String args[]){  
 TreeSet<String> set=new TreeSet<String>();  
         set.add("AA");  
         set.add("BB");  
         set.add("CC");  
         System.out.println("Traversing element through Iterator in descending order");  
         Iterator i=set.descendingIterator();  
         while(i.hasNext())  
         {  
             System.out.println(i.next());  
         }  
 
 }  
}

import java.util.*;  
public class TreeSetExample{  
 public static void main(String args[]){  
 TreeSet<Integer> set=new TreeSet<Integer>();  
         set.add(10);  
         set.add(40);  
         set.add(30);  
         set.add(20);  
         System.out.println("Lowest Value: "+set.pollFirst());  
         System.out.println("Highest Value: "+set.pollLast());  
 }  
}

import java.util.*;  
class TreeSetExample{  
 public static void main(String args[]){  
  TreeSet<String> set=new TreeSet<String>();  
         set.add("XYZ");  
         set.add("XZY");  
         set.add("YZX");  
         set.add("ZYX");  
         set.add("YXZ");  
         System.out.println("Initial Set: "+set);  
 
         System.out.println("Reverse Set: "+set.descendingSet());  
 
         System.out.println("Headset: "+set.headSet("YZX", true));  
 
         System.out.println("SubSet: "+set.subSet("XYZ", false, "YXZ", true));  
 
         System.out.println("TailSet: "+set.tailSet("YZX", false));  
 }  
}

import java.util.*;  
public class TreeSetExample{  
 public static void main(String args[]){  
  TreeSet<String> set=new TreeSet<String>();  
         set.add("XYZ");  
         set.add("XZY");  
         set.add("YZX");  
         set.add("ZYX");  
         set.add("YXZ");
 
         System.out.println("Initial Set: "+set);  
 
         System.out.println("Headset: "+set.headSet("YZX"));  
 
         System.out.println("SubSet: "+set.subSet("XYZ", "YXZ"));  
 
         System.out.println("TailSet: "+set.tailSet("YZX"));  
 }  
}