Design Patterns in Java Standard Libraries

In this section

• Java Singleton Pattern in Runtime and Logger APIs
  Explain how `Runtime` and logger singletons work and what trade-offs they introduce.
• Java Decorator Pattern in I/O Streams for Wrapping
  Extend I/O stream behavior with decorators instead of subclassing.
• Iterator Pattern in Java Collections Framework
  Show how the Iterator pattern works inside the Java Collections Framework and why it matters.
• Java Strategy Pattern with Comparator Sorting
  Use `Comparator` to switch sorting behavior at runtime without changing the calling code.
• Java Factory Patterns in JDBC Connection APIs
  Use factory-style JDBC APIs to keep database creation flexible and explicit.
• Java Prototype Pattern with Object Cloning Trade-Offs
  Use cloning, shallow copies, and deep copies to implement the Prototype pattern safely.
• Java Template Method Pattern in Abstract Classes
  Define algorithm skeletons in abstract classes and customize selected steps in subclasses.