Convert Stream to Typed Array in Java

In this article, we will learn how to change a Java Stream into a typed array in Java. By using the toArray() method with a constructor reference, we can ensure that the array has the right type.

Problem Statement

Stream.of("Bing Bang Theory", "Vampire Diaries", "Game of Thrones", "Homecoming")

Array...Bing Bang TheoryVampire DiariesGame of ThronesHomecoming

Steps to convert the stream to a typed array

The following are the steps to covert the stream to a typed array ?

• Imports the necessary classes from java.util and java.util.stream packages
• Create a Stream of strings.
  
• Convert the Stream to a typed array using toArray().
  
• Return the array elements.

Java program to convert the stream to a typed array

The following is an example of converting the stream to a typed array ?

import java.util.Arrays;
import java.util.stream.Stream;
public class Demo {
	public static void main(String[] args) {
		Stream<String> stream = Stream.of("Bing Bang Theory", "Vampire Diaries", "Game of Thrones", "Homecoming");
		final String[] strArr = stream.toArray(String[]::new);
		System.out.println("Array...");
		Arrays.asList(strArr).forEach(n-> System.out.println(n));
	}
}

Output

Array...
Bing Bang Theory
Vampire Diaries
Game of Thrones
Homecoming

Code Explanation

The Stream is created with Stream.of(). The toArray() method converts the Stream to a String[] using String[]::new to specify the array type. The array elements are then printed using forEach().