Book Image

Transitioning to Java

By : Ken Fogel
Book Image

Transitioning to Java

By: Ken Fogel

Overview of this book

This comprehensive guide will help non-Java developers already using different languages transition from their current language to all things Java. The chapters are designed in a way that re-enforces a developer’s existing knowledge of object-oriented methodologies as they apply to Java. This book has been divided into four sections, with each section touching upon different aspects that’ll enable your effective transition. The first section helps you get to grips with the Java development environment and the Maven build tool for modern Java applications. In the second section, you’ll learn about Java language fundamentals, along with exploring object-oriented programming (OOP) methodologies and functional programming and discovering how to implement software design patterns in Java. The third section shows you how to code in Java on different platforms and helps you get familiar with the challenges faced on these platforms. In the fourth section, you’ll find out how you can manage and package your Java code. By the end of this Java programming book, you’ll have learned the core concepts of Java that’ll help you successfully transition from a different language to Java.
Table of Contents (23 chapters)
1
Part 1:The Java Development Environment
5
Part 2:Language Fundamentals
15
Part 3:GUI and Web Coding in Java
19
Part 4:Packaging Java Code

Creating new virtual threads

As pointed out at the beginning of the previous section, native Java threads are managed by the JVM by working directly with the OS’s threading library. There is a one-to-one relationship between a native thread and an OS thread. This new approach is called virtual threads. While native threads are managed by the JVM in collaboration with the OS, virtual threads are managed exclusively by the JVM. OS threads are still used, but what makes this approach significant is that virtual threads can share OS threads and are no longer one-to-one.

Virtual threads do not run faster and can suffer from race and deadlock conditions. What is special with virtual threads is that the number of threads that you can start up could be in the millions. How we use virtual threads is not much different from native threads. The following code snippet shows the perform method that we saw in the previous examples creating virtual threads. The thread class is unchanged...