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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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Maps

The collections framework offers one more interface, java.util.Map, which can be used when dealing with data that is stored as key-value pairs. This type of data storage is becoming more and more relevant as data formats such as JSON are slowly taking over the internet. JSON is a data format that is based on having data stored in the form of nested arrays that always respond to the key-value structure.

Having data organized in this way offers the possibility of having a very simple way to look for data – by means of the keys instead of using, for example, an index, as we would do in an array. Keys are the way we can identify the block of data we are looking for within a map. Let's look at a simple example of a map before looking at alternatives to maps:

The following example shows how to create a simple map and how to print some messages based on the information available within it. The first thing that you will notice in comparison to other interfaces in the...

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The Java Workshop
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