8 Lesser-Known Java Streams API Features

Less known java streams features with example

Introduction

Java Streams provide many out-of-the-box powerful features. In this article, we will look into some of the lesser-used or known features among the developers.

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1. Stream.ofNullable

This method was introduced in Java 9 and helps filter all the null values from the collection, potentially saving us from null pointer exceptions.

In the example below we have a names list that contains null, which we filter using the Stream.ofNullable method.

[Alice, Bob, Charlie]

2. Stream.iterate()

iterate() method is used for creating infinite streams of sequences. It takes seed and unary function that applies the function to the previous element.

static <T> Stream<T> iterate(T seed, UnaryOperator<T> f)

In the below example, our seed is 0, and the unary operator is n -> n+2.

0
2
4
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8
10
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• Since iterate() generates infinite streams we should have some termination such as limit, findFirst, or findAny, etc. to avoid an infinite loop.