Book Image

Learn Java with Projects

By : Dr. Seán Kennedy, Maaike van Putten
5 (3)
Book Image

Learn Java with Projects

5 (3)
By: Dr. Seán Kennedy, Maaike van Putten

Overview of this book

Learn Java with Projects stands out in the world of Java guides; while some books skim the surface and others get lost in too much detail, this one finds a nice middle ground. You’ll begin by exploring the fundamentals of Java, from its primitive data types through to loops and arrays. Next, you’ll move on to object-oriented programming (OOP), where you’ll get to grips with key topics such as classes, objects, encapsulation, inheritance, polymorphism, interfaces, and more. The chapters are designed in a way that focuses on topics that really matter in real-life work situations. No extra fluff here, so that you get more time to spend on the basics and form a solid foundation. As you make progress, you’ll learn advanced topics including generics, collections, lambda expressions, streams and concurrency. This book doesn't just talk about theory—it shows you how things work with little projects, which eventually add up to one big project that brings it all together. By the end of this Java book, you’ll have sound practical knowledge of Java and a helpful guide to walk you through the important parts of Java.
Table of Contents (22 chapters)
1
Part 1: Java Fundamentals
9
Part 2: Object-Oriented Programming
15
Part 3: Advanced Topics

Using Java’s built-in methods for arrays

Working with arrays is very common. Usually, for very common things, Java has built-in functionality. We can do many common things we’d like to do with arrays with the use of the methods on the built-in Arrays class.

Built-in Arrays class for working with arrays

The built-in Arrays class is a helper class in the java.util package. It offers many utility methods to help us efficiently work with arrays. We’ll explore some common array manipulation tasks using the Arrays class.

The toString() method

A highly useful operation you may want to perform on an array is to convert it into a String, which can be invaluable for debugging and logging purposes. To achieve this, the Arrays class offers a dedicated method called toString(). It’s important to note that this method is static, allowing us to call it directly on the Arrays class.

import java.util.Arrays;public class ArrayHelperMethods {
   ...