Java Coding Problems

103. Creating a Stream from an array

Once we create a Stream from an array, we have access to all the Stream API goodies. Therefore, this is a handy operation that is important to have in our tool belt.

Let's start with an array of strings (can be other objects as well):

String[] arr = {"One", "Two", "Three", "Four", "Five"};

The easiest way to create Stream from this String[] array is to rely on the Arrays.stream() method available starting with JDK 8:

Stream<String> stream = Arrays.stream(arr);

Or, if we need a stream from a sub-array, then simply add the range as arguments. For example, let's create a Stream from the elements that range between (0,2), which are one and two:

Stream<String> stream = Arrays.stream(arr, 0, 2);

The same cases, ...