Book Image

Java 9 Programming Blueprints

By : Jason Lee
Book Image

Java 9 Programming Blueprints

By: Jason Lee

Overview of this book

Java is a powerful language that has applications in a wide variety of fields. From playing games on your computer to performing banking transactions, Java is at the heart of everything. The book starts by unveiling the new features of Java 9 and quickly walks you through the building blocks that form the basis of writing applications. There are 10 comprehensive projects in the book that will showcase the various features of Java 9. You will learn to build an email filter that separates spam messages from all your inboxes, a social media aggregator app that will help you efficiently track various feeds, and a microservice for a client/server note application, to name a few. The book covers various libraries and frameworks in these projects, and also introduces a few more frameworks that complement and extend the Java SDK. Through the course of building applications, this book will not only help you get to grips with the various features of Java 9, but will also teach you how to design and prototype professional-grade applications with performance and security considerations.
Table of Contents (19 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
9
Taking Notes with Monumentum

Writing our own nodes


The preceding section covered those two classes, but what is YearChildFactory? The class RootNode defines for the system the root node of what will become our tree. Each node, though, if it has children, is responsible for loading and building those child Nodes, which is done through this ChildFactory class. Our instance looks like this:

    public class YearChildFactory extends ChildFactory<String> { 
      private final PhotoManager photoManager; 
      private static final Logger LOGGER =  
        Logger.getLogger(YearChildFactory.class.getName()); 
      public YearChildFactory() { 
        this.photoManager =  
          Lookup.getDefault().lookup(PhotoManager.class); 
        if (photoManager == null) { 
          LOGGER.log(Level.SEVERE,  
          "Cannot get PhotoManager object"); 
          LifecycleManager.getDefault().exit(); 
        } 
      } 
 
      @Override 
      protected boolean createKeys(List<String> list) { 
        list.addAll...