Chapter 4. Introducing streams

Collections is the most heavily used API in Java. What would you do without collections? Nearly every Java application makes and processes collections. Collections are fundamental to many programming tasks: they let you group and process data. To illustrate collections in action, imagine you want to create a collection of dishes to represent a menu and then iterate through it to sum the calories of each dish. You may want to process the collection to select only low-calorie dishes for a special healthy menu. But despite collections being necessary for almost any Java application, manipulating collections is far from perfect:

4.1. What are streams?

4.2. Getting started with streams

4.3. Streams vs. collections

4.4. Stream operations

4.5. Summary