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Java 9 Programming Blueprints

You're reading from   Java 9 Programming Blueprints Master features like modular programming, Java HTTP 2.0, and REPL by building numerous applications

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Product type Paperback
Published in Jul 2017
Publisher Packt
ISBN-13 9781786460196
Length 466 pages
Edition 1st Edition
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Author (1):
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Jason Lee Jason Lee
Author Profile Icon Jason Lee
Jason Lee
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Table of Contents (13) Chapters Close

Preface 1. Introduction FREE CHAPTER 2. Managing Processes in Java 3. Duplicate File Finder 4. Date Calculator 5. Sunago - A Social Media Aggregator 6. Sunago - An Android Port 7. Email and Spam Management with MailFilter 8. Photo Management with PhotoBeans 9. Taking Notes with Monumentum 10. Serverless Java 11. DeskDroid - A Desktop Client for Your Android Phone 12. What is Next?

Building the command-line interface

The primary means to interact with our new library will be the command-line interface we will now develop. Unfortunately, the Java SDK has nothing built in to help make sophisticated command-line utilities. If you've been using Java for any time, you've seen the following method signature:

    public static void main(String[] args) 

Clearly, there is a mechanism to process command-line arguments. The public static void main method is passed string arrays that represent arguments provided by the user on the command line, but that's about as far as it goes. To parse the options, the developer is required to iterate over the array, analyzing each entry. It might look something like this:

    int i = 0; 
    while (i < args.length) { 
      if ("--source".equals(args[i])) { 
         System.out.println("--source...
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