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AbstractSet toArray() method in Java with Example

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  • Last Updated : 24 Dec, 2018
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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 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 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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