The toArray() method of Java HashSet is used to form an array of the same elements as that of the HashSet. Basically, it copies all the element from a HashSet to a new array.
Syntax:
Object[] arr = HashSet.toArray()
Parameters: The method does not take any parameters.
Return Value: The method returns an array containing the elements similar to the HashSet.
Below programs illustrate the HashSet.toArray() method:
Program 1:
// Java code to illustrate toArray() import java.util.*; public class HashSetDemo { public static void main(String args[]) { // Creating an empty HashSet HashSet<String> abs_col = new HashSet<String>(); // Use add() method to add // elements into the HashSet abs_col.add("Welcome"); abs_col.add("To"); abs_col.add("Geeks"); abs_col.add("For"); abs_col.add("Geeks"); // Displaying the HashSet System.out.println("The HashSet: " + 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 HashSet: [Geeks, For, Welcome, To] The array is: Geeks For Welcome To
Program 2:
// Java code to illustrate toArray() import java.util.*; public class HashSetDemo { public static void main(String args[]) { // Creating an empty HashSet HashSet<Integer> abs_col = new HashSet<Integer>(); // Use add() method to add // elements into the HashSet 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 HashSet System.out.println("The HashSet: " + 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 HashSet: [20, 5, 25, 10, 30, 15] The array is: 20 5 25 10 30 15
