Java Collection Tutorial - Java TreeSet.pollFirst()

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Syntax

TreeSet.pollFirst() has the following syntax.

public E pollFirst()

Example

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

/*from  ww  w  .ja v  a2  s .  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.

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