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Java program to create a TreeSet collection using List collection

Given a List collection, we have to create a TreeSet collection using it.
Submitted by Nidhi, on June 04, 2022

Problem statement

In this program, we will create a TreeSet collection with integer elements using the List collection. Here, we will pass the List collection into the constructor of the TreeSet collection.

Java program to create a TreeSet collection using List collection

The source code to create a TreeSet collection using the List collection is given below. The given program is compiled and executed successfully.

// Java program to create a TreeSet collection 
// using the List collection

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

public class Main {
  public static void main(String args[]) {
    List list = new ArrayList();

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

    TreeSet < Integer > tree = new TreeSet < Integer > (list);

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

Output

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

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. And, created a List collection list and added integer elements using add() method. Then, we created a Tree collection tree using the constructor by passing the list as an argument. After that, we printed the result.

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