Java: Get the number of elements in a tree set

Last update on May 22 2025 13:15:43 (UTC/GMT +8 hours)

7. TreeSet Size

Write a Java program to get the number of elements in a tree set.

Sample Solution:

Java Code:

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

  public class Exercise7 {
  public static void main(String[] args) {
    // create an empty tree set
     TreeSet<String> t_set = new TreeSet<String>();
   // use add() method to add values in the tree set
          t_set.add("Red");
          t_set.add("Green");
          t_set.add("Black");
          t_set.add("Pink");
          t_set.add("orange");
     System.out.println("Original tree set: " + t_set);
    System.out.println("Size of the tree set: " + t_set.size());
   }
}

Sample Output:

Original tree set: [Black, Green, Pink, Red, orange]                   
Size of the tree set: 5

Flowchart:

For more Practice: Solve these Related Problems:

Write a Java program to compute the size of a TreeSet after adding and removing several elements using the size() method.
Write a Java program to use Java streams to count the number of elements in a TreeSet and compare it with size().
Write a Java program to calculate the size of a TreeSet after performing a bulk addition of elements from an array.
Write a Java program to check if the size of a TreeSet is a prime number and print a corresponding message.

Go to:

PREV : Clone TreeSet.
NEXT : Compare TreeSets.

Java Code Editor:

Contribute your code and comments through Disqus.