Map in Java, with Examples
Learn how to use the Java Map interface with examples: HashMap, TreeMap and LinkedHashMap, their key methods, iterators and working with your own objects.
Articles
How to Create Development Environments with Vagrant and Puppet (Video)
Learn how Vagrant and Puppet let you build portable, reproducible development environments with PHP, MySQL and MongoDB, so your whole team works the same way.
What Is Innovation? Part IV (Uncertainty in Innovation)
Learn why uncertainty is built into every innovation process, the 8 factors that create it, and the sources of information that help reduce risk.
MongoDB Course – Part I (Video) – “Introduction”
Start our practical MongoDB course: learn what a document-oriented database is, how MongoDB stores JSON data, and how it compares to relational databases.
What Is Innovation? Part III (Types of Innovation)
Learn the types of innovation through the famous innovation matrix: incremental, semi-radical and radical, with real examples from the technology world.
What Is Innovation? Part II (Social Model of Technology Adoption)
Learn how Rogers' social model of technology adoption classifies users, from Innovators to Laggards, with a real-world example: the iPhone.
What Is Innovation? Part I (Concepts and Examples)
Learn what innovation really means and why high tech is not the same thing. We look at the mop and the first tablets to tell an invention from an innovation.
AJAX with JSP and Servlets
Learn how to add AJAX to JSP and Servlets with a simple example: update a table without reloading the page. Full code and project available to download.
Sorting an ArrayList in Java
Learn how to sort an ArrayList in Java with Collections.sort and Comparator, for both simple values and objects, in ascending or descending order.
Auto Layout iOS 7 (Video)
Learn how to adapt your iOS app to every iPhone screen size with Auto Layout in iOS 7. Watch the video tutorial and follow the steps with screenshots.
Debug Mode in Eclipse for Java (Video)
Learn how to use debug mode in Eclipse to debug a Java program: breakpoints, step-by-step execution with F5-F8, and a video tutorial.
Recommender Systems Based on Collaborative Filtering (K-Nearest Neighbors)
Learn how collaborative filtering recommender systems work with the K-nearest neighbors technique, similarity metrics (MSD, Pearson, cosine) and a worked example.