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

Understanding the exception hierarchy

Java is an object-oriented language, and objects can form a hierarchy. In Java, all exceptions are subclasses of the Throwable class. Everything that can be thrown by the application in case of a problem is of the Throwable type. The Throwable class has two main subclasses: Error and Exception.

Errors represent severe issues that occur during the runtime system’s operation, and they typically indicate critical problems with the JVM or the application environment. Examples include OutOfMemoryError and StackOverflowError. Errors are usually not recoverable, and it is not recommended to catch and handle them in your code.

On the other hand, the Exception class and its subclasses represent exceptional conditions that a program can handle. There are two main categories of exceptions: checked and unchecked exceptions.

Checked exceptions

Checked exceptions are exceptions that can be expected to happen, such as situations where we are...