java.util.TreeSet.iterator() Method

Description

The iterator() method is used to return an iterator over the elements in this set in ascending order.

Declaration

Following is the declaration for java.util.TreeSet.iterator() method.

public Iterator<E> iterator()

Parameters

• NA

Return Value

The method call returns an iterator over the elements in this set in ascending order.

Exception

• NA

Example

The following example shows the usage of java.util.TreeSet.iterator() method.

package com.tutorialspoint;

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

public class TreeSetDemo {
   public static void main(String[] args) {
      // creating a TreeSet 
      TreeSet <Integer>treeadd = new TreeSet<Integer>();
     
      // adding in the tree set
      treeadd.add(1);
      treeadd.add(13);
      treeadd.add(17);
      treeadd.add(2);
     
      // create ascending iterator
      Iterator iterator;
      iterator = treeadd.iterator();
     
      // displaying the Tree set data
      System.out.println("Tree set data in ascending order: ");     
      while (iterator.hasNext()){
         System.out.println(iterator.next() + " ");
      }
   }     
}

Let us compile and run the above program, this will produce the following result.

Tree set data in ascending order: 
1 
2 
13 
17