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)

Organizing Code into Packages

Java packages together related classes, interfaces, enums (a data type that contains a data type that contains a fixed group of constants), and annotations (contain metadata). In other words, a package is a collection of Java types brought together under a common name. Using a common name makes it easier to find code in larger projects, and helps to keep your code separate from other, perhaps similar, code. For example, more than one package might contain a class named Rectangle, so referring to the appropriate package will allow you to specify which Rectangle class you're looking for. Packages allow you to organize your code, which becomes more and more important as you work on larger and larger applications.

Java's API includes hundreds of classes divided into packages, such as java.math and java.net. As you'd expect, java.math has mathematics-related classes, and java.net has networking-related classes.

Importing Classes

When...