Design Patterns in Java

Observer

Singleton

Waiter

A Waiter relays an order Object to a Producer, waits in an independent thread during the production, and then delivers the result using a Consumer callback method.

Waiter.java
Producer.java
Consumer.java

Conservator

Conservator extends on the concept of a Flyweight Factory by allowing shared Flyweight objects to be mutated after creation without undesired side effects.

Conservator.java
Intrinsic.java
Extrinsic.java
Flyweight.java
Heavyweight.java

Resources

• Design Patterns: Elements of Reusable Object-Oriented Software
  1995; Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides

• Silicon Valley Patterns discussion group