Book Image

Java 11 Cookbook - Second Edition

By : Nick Samoylov, Mohamed Sanaulla
Book Image

Java 11 Cookbook - Second Edition

By: Nick Samoylov, Mohamed Sanaulla

Overview of this book

For more than three decades, Java has been on the forefront of developing robust software that has helped versatile businesses meet their requirements. Being one of the most widely used programming languages in history, it’s imperative for Java developers to discover effective ways of using it in order to take full advantage of the power of the latest Java features. Java 11 Cookbook offers a range of software development solutions with simple and straightforward Java 11 code examples to help you build a modern software system. Starting with the installation of Java, each recipe addresses various problem by explaining the solution and offering insights into how it works. You’ll explore the new features added to Java 11 that will make your application modular, secure, and fast. The book contains recipes on functional programming, GUI programming, concurrent programming, and database programming in Java. You’ll also be taken through the new features introduced in JDK 18.3 and 18.9. By the end of this book, you’ll be equipped with the skills required to write robust, scalable, and optimal Java code effectively.
Table of Contents (18 chapters)

Obtaining the process information of the current JVM


A running process has a set of attributes associated with it, such as the following:

  • PID: This uniquely identifies the process
  • Owner: This is the name of the user who launched the process
  • Command: This is the command that runs under the process
  • CPU time: This indicates the time for which the process has been active
  • Start time: This indicates the time when the process was launched

These are a few attributes that we are generally interested in. Perhaps we would also be interested in CPU usage or memory usage. Now, getting this information from within Java was not possible prior to Java 9. However, in Java 9, a new set of APIs has been introduced, which enables us to get the basic information about the process. 

In this recipe, we will see how to get the process information for the current Java process; that is, the process that is executing your code.

How to do it...

Follow these steps:

  1. Create a simple class and use ProcessHandle.current() to get...