AbstractSet toArray() method in Java with Example

Last Updated : 24 Dec, 2018
The toArray() method of Java AbstractSet is used to form an array of the same elements as that of the AbstractSet. Basically, it copies all the element from a AbstractSet to a new array. Syntax: 
Object[] arr = AbstractSet.toArray()
Parameters: The method does not take any parameters. Return Value: The method returns an array containing the elements similar to the AbstractSet. Below programs illustrate the AbstractSet.toArray() method: Program 1: Java 
// Java code to illustrate toArray()

import java.util.*;

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

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

        // Displaying the AbstractSet
        System.out.println("The AbstractSet: "
                           + 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 AbstractSet: [For, Geeks, To, Welcome]
The array is:
For
Geeks
To
Welcome
Program 2: Java 
// Java code to illustrate toArray()

import java.util.*;

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

        // Use add() method to add
        // elements into the AbstractSet
        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 AbstractSet
        System.out.println("The AbstractSet: "
                           + 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 AbstractSet: [5, 10, 15, 20, 25, 30]
The array is:
5
10
15
20
25
30
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