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)

Changing the working directory of a subprocess


Often, you'll want a process to be executed in the context of a path, such as listing the files in a directory. To do so, we will have to tell ProcessBuilder to launch the process in the context of a given location. We can achieve this by using the directory() method. This method serves two purposes: 

  • It returns the current directory of execution when we don't pass any parameters.
  • It sets the current directory of execution to the passed value when we pass a parameter.

In this recipe, we will see how to execute the 

tree command to recursively traverse all the directories from the current directory and print it in the form of a tree. 

Getting ready

Generally, the tree command doesn't come preinstalled, so you will have to install the package that contains the command. To install on an Ubuntu/Debian-based system, run the following command:

$ sudo apt-get install tree

To install on Linux, which supports the yum package manager, run the following command...