The Java 8 Stream API Tutorial

In this comprehensive tutorial, we’ll go through the practical uses of Java 8 Streams from creation to parallel execution.

public interface Stream<T>
extends BaseStream<T,Stream<T>>

A sequence of elements supporting sequential and parallel aggregate operations. The following example illustrates an aggregate operation using Stream and IntStream:


     int sum = widgets.stream()
                      .filter(w -> w.getColor() == RED)
                      .mapToInt(w -> w.getWeight())
                      .sum();

When builder is used, the desired type should be additionally specified in the right part of the statement, otherwise the build() method will create an instance of the Stream<Object>:

Stream<String> streamBuilder =
  Stream.<String>builder().add("a").add("b").add("c").build();

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The Java 8 Stream API Tutorial

When builder is used, the desired type should be additionally specified in the right part of the statement, otherwise the build() method will create an instance of the Stream<Object>:

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