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