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Java TreeSet higher() Method with Example

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

TreeSet Class higher() method

• higher() method is available in java.util package.
• higher() method is used to return the lowest element in this TreeSet that is higher than the specified element (ele).
• higher() 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.
• higher() 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.

Syntax:

    public Element higher(Element ele);

Parameter(s):

• 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 least element higher than the given element (ele) in this TreeSet otherwise it returns null.

Example:

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

import java.util.*;

public class HigherOfTreeSet {
    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 
        tree_set.add("C");
        tree_set.add("C++");
        tree_set.add("JAVA");
        tree_set.add("PHP");
        tree_set.add("SFDC");

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

        // By using higher() method is to
        // return the least element higher than
        // the given element i.e. PHP
        Object least = tree_set.higher("Microservices");

        // Display least
        System.out.println("tree_set.higher(Microservices): " + least);
    }
}

Output

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