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The Java Workshop

The Java Workshop

By : David Cuartielles , Andreas Göransson, Foster-Johnson
3.1 (8)
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The Java Workshop

The Java Workshop

3.1 (8)
By: David Cuartielles , Andreas Göransson, 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)
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Regular Expressions in Java

Now that you have an idea of how regular expressions can be used to match patterns, this topic will focus on how regular expressions can be used within Java applications. To use regular expressions in Java, the java.util.regex package is available. The two main classes there are called Pattern and Matcher.

The Pattern class handles the actual pattern; it validates, compiles, and returns a Pattern object that you can store and reuse multiple times. It can also be used to perform quick validations against a supplied string.

The Matcher class allows us to extract more information, and to perform different kinds of matching on the supplied text.

Creating a Pattern object is as simple as using the static compile method.

For example, you would like to compile a pattern to ensure that a text contains at least one a. Your Java code should be as follows:

Pattern pattern = Pattern.compile("a+");
Matcher matcher = pattern.matcher("How...
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The Java Workshop
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