Book Image

The Java Workshop

By : David Cuartielles, Andreas Göransson, Eric Foster-Johnson
4 (2)
Book Image

The Java Workshop

4 (2)
By: David Cuartielles, Andreas Göransson, Eric Foster-Johnson

Overview of this book

Java is a versatile, popular programming language used across a wide range of industries. Learning how to write effective Java code can take your career to the next level, and The Java Workshop will help you do just that. This book is designed to take the pain out of Java coding and teach you everything you need to know to be productive in building real-world software. The Workshop starts by showing you how to use classes, methods, and the built-in Collections API to manipulate data structures effortlessly. You’ll dive right into learning about object-oriented programming by creating classes and interfaces and making use of inheritance and polymorphism. After learning how to handle exceptions, you’ll study the modules, packages, and libraries that help you organize your code. As you progress, you’ll discover how to connect to external databases and web servers, work with regular expressions, and write unit tests to validate your code. You’ll also be introduced to functional programming and see how to implement it using lambda functions. By the end of this Workshop, you’ll be well-versed with key Java concepts and have the knowledge and confidence to tackle your own ambitious projects with Java.
Table of Contents (20 chapters)

Getting Started with Unit Tests

A unit test tests one unit of code. In Java terms, this usually means that a unit test tests a single Java class. The test should run quickly, so you know whether there are any problems as soon as possible.

A unit test is a separate Java class designed just for testing. You should write separate test methods for each part of the original class you want to test. Typically, the more fine-grained the test, the better.

Sometimes, due to necessity, a unit test will test more than one class. That's OK and not something to worry about. In general, though, you want to concentrate on writing separate tests for each class in your Java application.

Note

Writing your Java classes so that they are easy to test will improve your code. You'll have better code organization, clearer code, and better quality as a result.

Integration tests, on the other hand, test a part of the entire system, including external dependencies. For example, a unit...