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About Ilias Tsagklis

Ilias is a software developer turned online entrepreneur. He is co-founder and Executive Editor at Java Code Geeks.

TreeSet Iterator example

In this example we shall show you how to get a TreeSet Iterator. To get a TreeSet Iterator one should perform the following steps:

  • Create a new TreeSet.
  • Populate the set with elements, with add(E e) API method of TreeSet.
  • Obtain an Iterator of the set, with iterator() API method of TreeSet. It is an iterator over the elements in this set in ascending order.
  • Iterate over the set’s elements, with hasNext(), next() API methods of Iterator, to get the TreeSet’s elements,

as described in the code snippet below.
 

package com.javacodegeeks.snippets.core;

import java.util.TreeSet;
import java.util.Iterator;
 
public class TreeSetIteratorExample {
 
  public static void main(String[] args) {
 
    // Create a TreeSet and populate it with elements
    TreeSet treeSet = new TreeSet();
    treeSet.add("element_1");
    treeSet.add("element_2");
    treeSet.add("element_3");
 
    // To get the Iterator use the iterator() operation
    Iterator it = treeSet.iterator();
 
    System.out.println("Elements in TreeSet :");
    while(it.hasNext())

System.out.println(it.next());
  }
}

Output:

Elements in TreeSet :
element_1
element_2
element_3

 
This was an example of how to get a TreeSet Iterator in Java.

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