Modern Java in Action

Chapter 4. Introducing streams

This chapter covers

• What is a stream?
• Collections versus streams
• Internal versus external iteration
• Intermediate versus terminal operations

What would you do without collections in Java? 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 are tasked to create a collection of dishes to represent a menu to calculate different queries. For example, you may want to find out the total number of calories for the menu. Or, you may need to filter the menu to select only low-calorie dishes for a special healthy menu. But despite collections being necessary for almost ...