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TreeSet toArray() method in Java with Example

  • Last Updated : 27 Dec, 2018

The toArray() method of Java TreeSet is used to form an array of the same elements as that of the TreeSet. Basically, it copies all the element from a TreeSet to a new array.

Syntax:

Object[] arr = TreeSet.toArray()

Parameters: The method does not take any parameters.

Return Value: The method returns an array containing the elements similar to the TreeSet.

Below programs illustrate the TreeSet.toArray() method:



Program 1:




// Java code to illustrate toArray()
  
import java.util.*;
  
public class TreeSetDemo {
    public static void main(String args[])
    {
        // Creating an empty TreeSet
        TreeSet<String>
            set = new TreeSet<String>();
  
        // Use add() method to add
        // elements into the TreeSet
        set.add("Welcome");
        set.add("To");
        set.add("Geeks");
        set.add("For");
        set.add("Geeks");
  
        // Displaying the TreeSet
        System.out.println("The TreeSet: "
                           + set);
  
        // Creating the array and using toArray()
        Object[] arr = set.toArray();
  
        System.out.println("The array is:");
        for (int j = 0; j < arr.length; j++)
            System.out.println(arr[j]);
    }
}
Output:
The TreeSet: [For, Geeks, To, Welcome]
The array is:
For
Geeks
To
Welcome

Program 2:




// Java code to illustrate toArray()
  
import java.util.*;
  
public class TreeSetDemo {
    public static void main(String args[])
    {
        // Creating an empty TreeSet
        TreeSet<Integer>
            set = new TreeSet<Integer>();
  
        // Use add() method to add
        // elements into the TreeSet
        set.add(10);
        set.add(15);
        set.add(30);
        set.add(20);
        set.add(5);
        set.add(25);
  
        // Displaying the TreeSet
        System.out.println("The TreeSet: "
                           + set);
  
        // Creating the array and using toArray()
        Object[] arr = set.toArray();
  
        System.out.println("The array is:");
        for (int j = 0; j < arr.length; j++)
            System.out.println(arr[j]);
    }
}
Output:
The TreeSet: [5, 10, 15, 20, 25, 30]
The array is:
5
10
15
20
25
30

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