Book Image

The Java Workshop

By : David Cuartielles, Andreas Göransson, Eric Foster-Johnson
Book Image

The Java Workshop

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)

Introduction

The java.lang.Process class is used to look for information about, and launch, runtime processes. If you want to understand how the Process class works, you can start by looking at the Runtime class. All Java programs include an instance of the Runtime class. It is possible to get information about the Runtime class by calling the getRuntime() method and assigning its outcome to a variable of the Runtime class. With that, it is possible to obtain information about the JVM environment that commands your program:

public class Example01 {
    public static void main(String[] args) {
        Runtime runtime = Runtime.getRuntime();
        System.out.println("Processors: " + runtime.availableProcessors());
        System.out.println("Total memory: " + runtime.totalMemory());
       ...