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)

Redirecting the process output and error streams to file


In this recipe, we will see how to deal with the output and error streams of a process spawned from the Java code. We will write the output or error produced by the spawned process to a file. 

 

 

Getting ready

In this recipe, we will make use of the iostat command. This command is used for reporting the CPU and I/O statistics for different devices and partitions. Let's run the command and see what it reports:

$ iostat

Note

In some Linux distributions, such as Ubuntu, iostat is not installed by default. You can install the utility by running sudo apt-get install sysstat.

The output of the preceding command is as follows:

How to do it...

Follow these steps:

  1. Create a new ProcessBuilder object by specifying the command to be executed:
        ProcessBuilder pb = new ProcessBuilder("iostat");
  1. Redirect the output and error streams to the file's output and error, respectively:
        pb.redirectError(new File("error"))
          .redirectOutput(new File...