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)

Sets

Sets within the collections framework are the programmatic equivalent of mathematical sets. This means that they can store objects of a specific type while avoiding duplicates. In the same way, sets offer methods that will let you handle data as you would in mathematics. You can add objects to a set, check whether a set is empty, combine the elements of two sets to add all their elements into a single set, see what objects coincide with each other between two sets, and calculate the difference between two sets.

In the java.util.Sets class, we find three interfaces used to represent sets: HashSet, TreeSet, and LinkedHashSet. The differences between them are straightforward:

  • HashSet will store data without guaranteeing the order of iteration.
  • TreeSet orders a set by value.
  • LinkedHashSet orders a set by arrival time.

Each of these interfaces is meant to be used under specific circumstances. Let's look at a couple of examples of sets, departing from...