HashSet toArray() method in Java with Example
Last Updated :
24 Dec, 2018
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:
import java.util.*;
public class HashSetDemo {
public static void main(String args[])
{
HashSet<String>
abs_col = new HashSet<String>();
abs_col.add( "Welcome" );
abs_col.add( "To" );
abs_col.add( "Geeks" );
abs_col.add( "For" );
abs_col.add( "Geeks" );
System.out.println( "The HashSet: "
+ abs_col);
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:
import java.util.*;
public class HashSetDemo {
public static void main(String args[])
{
HashSet<Integer>
abs_col = new HashSet<Integer>();
abs_col.add( 10 );
abs_col.add( 15 );
abs_col.add( 30 );
abs_col.add( 20 );
abs_col.add( 5 );
abs_col.add( 25 );
System.out.println( "The HashSet: "
+ abs_col);
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
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