A tutorial highlighting the various design patterns in Java. ... factory class or make the factory method static. For example, ... of a Class and ensures that only one instance of the ...

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 ...

Another challenge for new Java developers is that the Gang of Four patterns spring from object-oriented programming, with examples based on C++ and Smalltalk, not Java code.