Java: Retrieve and remove the last element of a tree set

Last update on May 22 2025 13:14:20 (UTC/GMT +8 hours)

15. Poll Last TreeSet Element

Write a Java program to retrieve and remove the last element of a tree set.

Sample Solution:

Java Code:

import java.util.TreeSet;
import java.util.Iterator;

  public class Exercise15 {
  public static void main(String[] args) {
 // creating TreeSet 
   TreeSet <Integer>tree_num = new TreeSet<Integer>();
   TreeSet <Integer>treeheadset = new TreeSet<Integer>();
     
   // Add numbers in the tree
   tree_num.add(10);
   tree_num.add(22);
   tree_num.add(36);
   tree_num.add(25);
   tree_num.add(16);
   tree_num.add(70);
   tree_num.add(82);
   tree_num.add(89);
   tree_num.add(14);
   System.out.println("Original tree set: "+tree_num);
   System.out.println("Removes the last element: "+tree_num.pollLast());
   System.out.println("Tree set after removing last element: "+tree_num);
   }    
}

Sample Output:

Original tree set: [10, 14, 16, 22, 25, 36, 70, 82, 89]                
Removes the last element: 89                                           
Tree set after removing last element: [10, 14, 16, 22, 25, 36, 70, 82]

Flowchart:

For more Practice: Solve these Related Problems:

Write a Java program to use pollLast() on a TreeSet to retrieve and remove the last element, then display the updated set.
Write a Java program to implement a recursive approach to remove and return the last element of a TreeSet.
Write a Java program to compare the last element removed by pollLast() with the element obtained by descendingIterator().
Write a Java program to use a custom method to remove the last element from a TreeSet without altering the remaining elements' order.

Go to:

PREV : Poll First TreeSet Element.
NEXT : Remove Element from TreeSet.

Java Code Editor:

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