Design pattern implementation

• Setup gradle project: gradle init --type java-library

Patterns

• strategy : Implementation of duck behavior using strategy pattern.
• observer: Implementation of publish subscribe model.
• decorator: Implementation of beverage class using decorator pattern. Wrapping up beverage type during run time.
• factory: Implement a pizza store. A pizza factory which prepares variety of pizza.
• singleton: An implmentation of singleton class to create unique instance.
• command: On/Off remote control implementation using command pattern.
• adapter: An adapter which adapts an enumeration to an iterator.
• template: A class representing components of template pattern. There are different ways to implment this, only generic representation is shown.
• iterator: Iterator implementation for aggregate types like Array, Map etc. Different types of data structure encapuslated internal implementation by implmenting an iterator.
• composite: Implement tree structure print to demonstrate composition.

Reference

• Head First Design Patterns