We discuss some of the most common design patterns in Java and how they ... In the Abstract Factory Pattern, however, the if-else block of the above example would be replaced by multiple factory ...

Abstract classes and interfaces in Java serve fundamentally different ... it’s usually better to use an interface. The design pattern template method is good example of using abstract classes.

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 ...