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