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

Exercises

  1. Dinosaur care tasks are often very similar, but not identical. To make our code cleaner, we can use lambda expressions. Create a custom functional interface called DinosaurHandler with a method called handle(Dinosaur dinosaur). Implement it in a lambda expression that sets a dinosaur to be asleep or awake (first, add a property to your Dinosaur class if needed).
  2. Lambda expressions are extremely useful with the java.util.function interfaces. Let’s use them to manage dinosaurs:
    • Write a Predicate<Dinosaur> lambda that checks if a dinosaur is a carnivore
    • Write a Supplier<Dinosaur> lambda that returns a new dinosaur
    • Write a Consumer<Dinosaur> lambda that prints a dinosaur’s name
    • Write a Function<Dinosaur, String> lambda that returns a dinosaur’s diet
  3. Lambda expressions have specific rules about variable usage. We’re going to create an example of a lambda expression that modifies an “effectively final” variable...