SortedSet toArray() method in Java with Examples

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

Syntax:

Object[] toArray()

Parameters: The method does not take any parameters.

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

Note: The toArray() method in SortedSet is inherited from the Set interface in Java.

Below programs illustrate the SortedSet.toArray() method:

Program 1:

// Java code to illustrate toArray()

import java.util.*;

public class SortedSetDemo {
    public static void main(String args[])
    {

        // Creating an empty SortedSet
        SortedSet<String> abs_col
            = new TreeSet<String>();

        // Use add() method to add
        // elements into the SortedSet
        abs_col.add("Welcome");
        abs_col.add("To");
        abs_col.add("Geeks");
        abs_col.add("For");
        abs_col.add("Geeks");

        // Displaying the Set
        System.out.println("The SortedSet: "
                           + abs_col);

        // Creating the array and using toArray()
        Object[] arr = abs_col.toArray();

        System.out.println("The array is:");
        for (int j = 0; j < arr.length; j++)
            System.out.println(arr[j]);
    }
}

Output:

The SortedSet: [For, Geeks, To, Welcome]
The array is:
For
Geeks
To
Welcome

Program 2:

// Java code to illustrate toArray()

import java.util.*;

public class SetDemo {
    public static void main(String args[])
    {
        // Creating an empty SortedSet
        SortedSet<Integer> abs_col
            = new TreeSet<Integer>();

        // Use add() method to add
        // elements into the SortedSet
        abs_col.add(10);
        abs_col.add(15);
        abs_col.add(30);
        abs_col.add(20);
        abs_col.add(5);
        abs_col.add(25);

        // Displaying the SortedSet
        System.out.println("The SortedSet: "
                           + abs_col);

        // Creating the array and using toArray()
        Object[] arr = abs_col.toArray();

        System.out.println("The array is:");
        for (int j = 0; j < arr.length; j++)
            System.out.println(arr[j]);
    }
}

Output:

The SortedSet: [5, 10, 15, 20, 25, 30]
The array is:
5
10
15
20
25
30

Reference: https://docs.oracle.com/javase/7/docs/api/java/util/Set.html#toArray()