Strategy Pattern
The Strategy Pattern defines a family of algorithms, encapsulates each one, and them interchangeable. Strategy lets the algorithm vary independently from clients that use it.

Design Principle

• Favor composition over inheritance.
• Program to an interface, not an implementation.
• Identify the aspects of your application that vary  in other words, encapsulate what varies and separate them from what stays the same.

Example:

Latest Source Code:
Github: MiniDuckSimulator.java

Output:

I'm flying.
Quack
I can't fly.
I'm flying with a rocket!