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 

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