Here on Hackaday, we’re generally designers of hacks that live in the real world. Nevertheless, I’m convinced that some of the most interesting feats are at the mercy of what’s possible in software, ...

The Observable design pattern is used in many important Java APIs. One well-known example is a JButton that uses the ActionListener API to execute an action. In this example, we have an ActionListener ...

Before we dive into the Composite pattern, I must first define composite objects: objects that contain other objects; for example, a drawing may be composed of graphic primitives, such as lines, ...