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Lesson 11 - StreamAPI in Java - Generating streams

In the previous lesson, Introduction to StreamAPI and lambda expressions in Java, we introduced StreamAPI. Today, in this Java tutorial, we're going to introduce ways to create streams.

Creating streams

All of the collections we've introduced offer the stream() method, which can create a stream for us:

List<String> list = Arrays.asList("Peter", "John", "Michael");
Stream<String> stream =;

We can also create a stream from an array which isn't a fully-featured collection by using the stream() method from the Arrays library class:

String[] array = new String[] {"Peter", "John", "Michael"};
Stream<String> stream =;

The Stream interface also has the of() method which we can use to create a new stream:

Stream<String> stream = Stream.of("Peter", "John", "Martin");

Next, we're going to list numeric stream generators. These are utility methods we use to create numeric streams:


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In this Java tutorial, we'll learn about creating streams. We'll introduce numeric stream generators and their usage.

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Article has been written for you by Petr Štechmüller