Book Image

Learn Java with Projects

By : Dr. Seán Kennedy, Maaike van Putten
5 (3)
Book Image

Learn Java with Projects

5 (3)
By: Dr. Seán Kennedy, Maaike van Putten

Overview of this book

Learn Java with Projects stands out in the world of Java guides; while some books skim the surface and others get lost in too much detail, this one finds a nice middle ground. You’ll begin by exploring the fundamentals of Java, from its primitive data types through to loops and arrays. Next, you’ll move on to object-oriented programming (OOP), where you’ll get to grips with key topics such as classes, objects, encapsulation, inheritance, polymorphism, interfaces, and more. The chapters are designed in a way that focuses on topics that really matter in real-life work situations. No extra fluff here, so that you get more time to spend on the basics and form a solid foundation. As you make progress, you’ll learn advanced topics including generics, collections, lambda expressions, streams and concurrency. This book doesn't just talk about theory—it shows you how things work with little projects, which eventually add up to one big project that brings it all together. By the end of this Java book, you’ll have sound practical knowledge of Java and a helpful guide to walk you through the important parts of Java.
Table of Contents (22 chapters)
1
Part 1: Java Fundamentals
9
Part 2: Object-Oriented Programming
15
Part 3: Advanced Topics

Delving into primitive streams

Thus far, all our streams have been for Object types. For example, a Stream<Integer> caters for the wrapper class Integer. Java also has classes specifically tailored for streams of primitives. For example, assuming a stream of int primitives, rather than Stream<Integer>, we use IntStream. As we shall see shortly, primitive streams have some really useful methods for processing numeric data, such as sum() and average().

Table 16.1 introduces the primitive stream classes.

Wrapper stream

Primitive stream

Primitives catered for

Stream<Integer>

IntStream

int, short, byte, char

Stream<Double>

DoubleStream

double, float

Stream<Long>

...