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