Stream toArray() in Java with Examples

Last Updated : 06 Dec, 2018

Stream toArray() returns an array containing the elements of this stream. It is a terminal operation i.e, it may traverse the stream to produce a result or a side-effect. After the terminal operation is performed, the stream pipeline is considered consumed, and can no longer be used. Syntax :

Object[] toArray()

Return Value : The function returns an array containing the elements of this stream. Example 1 :

Java

// Java code for Stream toArray()
import java.util.*;
import java.util.stream.Stream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // Creating a Stream of Integers
        Stream<Integer> stream = Stream.of(5, 6, 7, 8, 9, 10);

        // Using Stream toArray()
        Object[] arr = stream.toArray();

        // Displaying the elements in array arr
        System.out.println(Arrays.toString(arr));
    }
}

Output :

[5, 6, 7, 8, 9, 10]

Example 2 :

Java

// Java code for Stream toArray()
import java.util.*;
import java.util.stream.Stream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // Creating a Stream of Strings
        Stream<String> stream = Stream.of("Geeks", "for",
                                          "Geeks", "GeeksQuiz");

        // Using Stream toArray()
        Object[] arr = stream.toArray();

        // Displaying the elements in array arr
        System.out.println(Arrays.toString(arr));
    }
}

Output :

[Geeks, for, Geeks, GeeksQuiz]

Example 3 :

Java

// Java code for Stream toArray()
import java.util.*;
import java.util.stream.Stream;

class GFG {

    // Driver code
    public static void main(String[] args)
    {
        // Creating a Stream of Strings
        Stream<String> stream = Stream.of("Geeks", "for",
                                          "gfg", "GeeksQuiz");

        // Using Stream toArray() and filtering
        // the elements that starts with 'G'
        Object[] arr = stream.filter(str
                                     -> str.startsWith("G"))
                           .toArray();

        // Displaying the elements in array arr
        System.out.println(Arrays.toString(arr));
    }
}