Streams are a powerful feature introduced in Java 8 that allow you to process data in a functional and declarative manner. In addition to working with collections, Java Streams also provide a convenient way to read and write arrays. In this blog post, we will explore how to read and write arrays using streams in Java.

Reading Arrays with Streams

To read an array using streams, we can convert the array to a stream using the Arrays.stream() method. Let’s say we have an integer array called numbers:

int[] numbers = {1, 2, 3, 4, 5};

We can read the array elements using the forEach() method, which accepts a lambda expression to perform an action on each element of the stream:

Arrays.stream(numbers)
      .forEach(number -> System.out.println(number));

This will print each element of the numbers array on a separate line.

Writing Arrays with Streams

To write data to an array using streams, we can use the toArray() method. Let’s say we have a list of strings called names:

List<String> names = Arrays.asList("John", "Jane", "Michael", "Emily");

We can convert the list to an array using the toArray() method:

String[] namesArray = names.stream()
                          .toArray(String[]::new);

In the toArray() method, we pass a method reference String[]::new to specify the type of the resulting array. The toArray() method returns an array containing the elements of the stream.

Conclusion

Streams provide a convenient way to read and write arrays in Java. By using the Arrays.stream() method, we can easily read array elements, and with the toArray() method, we can write data to an array. This allows us to perform various operations on arrays using the powerful features provided by Java Streams.

#java #stream #arrays