Introduction
This lesson introduces the Stream API.
We'll cover the following
The addition of the Stream
API was one of the major features added to Java 8. A Stream
in Java can be defined as a sequence of elements from a source that supports aggregate operations on them. The source here refers to collections or arrays that provide data to a stream.
A few important points about streams are:
-
A stream is not a data structure itself. It is a bunch of operations applied to a source. The source can be collections, arrays or I/O channels.
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Streams don’t change the original data structure.
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There can be zero or more intermediate operations that transform a stream into another stream.
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Each intermediate operation is lazily executed (This will be discussed later).
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Terminal operations produce the result of the stream.
Stream creation
Streams can be created from different element sources, e.g., a collection or an array with the help of stream()
and of()
methods. Below are the different ways to create a stream.
a) Stream.of(v1, v2, v3….)
In the below example, we are creating a stream of integers at line 7 using the Stream.of()
method.
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