Home » Java programming language

Java TreeSet lower() Method with Example

TreeSet Class lower() method: Here, we are going to learn about the lower() method of TreeSet Class with its syntax and example.
Submitted by Preeti Jain, on February 20, 2020

TreeSet Class lower() method

  • lower() method is available in java.util package.
  • lower() method is used to return the largest element in this TreeSet that is lower than the specified element (ele) when it exists otherwise it returns null.
  • lower() method is a non-static method, it is accessible with the class object only and if we try to access the method with the class name then we will get an error.
  • lower() method may throw an exception at the time of returning the element.
    • ClassCastException: This exception may throw when the given parameter is incompatible to compare.
    • NullPointerException: This exception may throw when the given element is null exists.


    public Element lower(Element ele);


  • Element ele – represents the element (ele) is to be checked with other element exists in this TreeSet.

Return value:

The return type of the method is Element, it returns highest element lower than the given element (ele) in this TreeSet otherwise it returns null when no such element exists.


// Java program to demonstrate the example 
// of Element lower(Element ele) method of TreeSet 

import java.util.*;

public class LowerOfTreeSet {
    public static void main(String[] args) {
        // Instantiates a TreeSet object
        TreeSet < String > tree_set = new TreeSet < String > ();

        // By using add() method is to add
        // the given object of this TreeSet 

        // Display TreeSet
        System.out.println("TreeSet: " + tree_set);

        // By using lower() method is to
        // return the greatest element
        // less than the given element
        // exists in this TreeSet
        Object greatest = tree_set.lower("DataScience");

        // Display Greatest
        System.out.println("tree_set.lower(): " + greatest);


TreeSet: [C, C++, JAVA, PHP, SFDC]
tree_set.lower(): C++


Comments and Discussions



Languages: » C » C++ » C++ STL » Java » Data Structure » C#.Net » Android » Kotlin » SQL
Web Technologies: » PHP » Python » JavaScript » CSS » Ajax » Node.js » Web programming/HTML
Solved programs: » C » C++ » DS » Java » C#
Aptitude que. & ans.: » C » C++ » Java » DBMS
Interview que. & ans.: » C » Embedded C » Java » SEO » HR
CS Subjects: » CS Basics » O.S. » Networks » DBMS » Embedded Systems » Cloud Computing
» Machine learning » CS Organizations » Linux » DOS
More: » Articles » Puzzles » News/Updates

© some rights reserved.