Java TreeSet.pollFirst()

Syntax

TreeSet.pollFirst() has the following syntax.

public E pollFirst()

Example

In the following code shows how to use TreeSet.pollFirst() method.


//  ww  w  .j  ava2s .c  o m

import java.util.Iterator;
import java.util.TreeSet;

public class Main {
   public static void main(String[] args) {
      
      TreeSet<Integer> treeadd = new TreeSet<Integer> ();
     
      treeadd.add(1);
      treeadd.add(3);
      treeadd.add(17);
      treeadd.add(2);
     
      System.out.println("First element is: "+treeadd.pollFirst());
      
      Iterator<Integer> iterator = treeadd.iterator();
     
      while (iterator.hasNext()){
         System.out.println(iterator.next());
      }
   }     
}

The code above generates the following result.