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Java TreeSet pollLast() Method with Example

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

TreeSet Class pollLast() method

• pollLast() method is available in java.util package.
• pollLast() method is used to return the last highest element and then remove the element from this TreeSet.
• pollLast() 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.
• pollLast() method does not throw an exception at the time of returning the highest element.

Syntax:

    public Element pollLast();

Parameter(s):

• It does not accept any parameter.

Return value:

The return type of the method is Element, it returns the last highest element from this TreeSet otherwise it returns null when no such element exists.

Example:

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

import java.util.*;

public class PollLastOfTreeSet {
    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 pollLast() method is to return
        // the last highest element and then remove
        // the element exists from this TreeSet
        Object last_highest = tree_set.pollLast();

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

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

Output

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