Obtain lowest and highest values from TreeSet example

With this example we are going to demonstrate how to obtain the lowest and highest values of a TreeSet. The TreeSet API provides us with methods for such operations. In short, to obtain lowest and highest values of TreeSet you should:

  • Create a new TreeSet.
  • Populate the set with elements, with add(E e) API method of TreeSet.
  • Get the lowest value currently in the TreeSet, with first() API method of TreeSet.
  • Get the highest value that is currently in the TreeSet, with last() API method of TreeSet.

Let’s take a look at the code snippet that follows:

package com.javacodegeeks.snippets.core;

import java.util.TreeSet;
public class LowHighValuesTreeSet {
  public static void main(String[] args) {
    // Create a TreeSet and populate it with elements
    TreeSet treeSet = new TreeSet();
    // Object first() returns the lowest value in the TreeSet 
    System.out.println("Lowest value in TreeSet is : "  + treeSet.first());
    // Object last() returns the highest value in the TreeSet 
    System.out.println("Highest value in TreeSet is : " + treeSet.last());


Lowest value in TreeSet is : element_1
Highest value in TreeSet is : element_5

This was an example of how to obtain lowest and highest values of a TreeSet in Java.

Byron Kiourtzoglou

Byron is a master software engineer working in the IT and Telecom domains. He is an applications developer in a wide variety of applications/services. He is currently acting as the team leader and technical architect for a proprietary service creation and integration platform for both the IT and Telecom industries in addition to a in-house big data real-time analytics solution. He is always fascinated by SOA, middleware services and mobile development. Byron is co-founder and Executive Editor at Java Code Geeks.
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