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
