Mastering Lambdas

CHAPTER3

Introduction to Streams and Pipelines

In Chapter 1 we saw two main themes in the motivations for introducing lambdas to Java. These two themes—better code and easier parallelism—come together in the introduction of streams for processing collections. Although lambda expressions are (in practice) essential for programming with streams, they are not enough: to use streams effectively, we need some new ideas specific to the programming model that they enable. In this chapter, we’ll explore the basic ideas underlying streams, with relatively straightforward examples of stream operations that should help to develop a basic intuition about ...