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

Exploring the Date API

The java.time package was introduced in Java 8 and was designed to replace the previous java.util.Date, java.util.Calendar, and java.text.DateFormat classes. The classes in java.time represent dates, times, timezones, instants, periods, and durations. The ISO calendar system is followed, which is the de facto world calendar (following Gregorian rules). All the classes are immutable and thread-safe.

It is a large API (https://docs.oracle.com/en/java/javase/21/docs/api/java.base/java/time/package-summary.html) with a large number of classes for dealing with dates, with relatively fewer classes dealing with times. Thankfully, despite the large number of methods available, the consistent use of method prefixes makes this manageable. We will look at these API prefixes shortly. But before we do that, let’s discuss the more important date and time classes.

Coordinated Universal Time (UTC)

UTC is the standard by which the world regulates clocks and time...