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Java program to remove all elements of TreeSet collection

Given a TreeSet collection, we have to remove all elements.
Submitted by Nidhi, on June 04, 2022

Problem statement

In this program, we will create the TreeSet collection with integer elements. Then we will remove all elements of the TreeSet collection using the clear() method.

Source Code

The source code to remove all elements of the TreeSet collection is given below. The given program is compiled and executed successfully.

// Java program to remove all elements of 
// TreeSet collection

import java.io.*;
import java.util.*;

public class Main {
  public static void main(String args[]) {
    TreeSet < Integer > tree = new TreeSet < Integer > ();

    tree.add(10);
    tree.add(20);
    tree.add(30);
    tree.add(40);
    tree.add(50);
    tree.add(60);

    System.out.println("TreeSet elements: " + tree);
    tree.clear();
    System.out.println("TreeSet elements: " + tree);
  }
}

Output

TreeSet elements: [10, 20, 30, 40, 50, 60]
TreeSet elements: []

Explanation

In the above program, we imported the "java.util.*", "java.io.*" packages to use the TreeSet class. Here, we created a public class Main.

The Main class contains a main() method. The main() method is the entry point for the program. Here, we created a TreeSet collection tree and add elements using add() method. Then we used the clear() method to remove all elements from TreeSet and printed the result.

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