Good challenges/tasks/exercises for learning or improving object oriented programming (OOP) skills

What is a good challenge to improve your skills in object oriented programming?

The idea behind this poll is to provide an idea of which exercises are useful for learning OOP.

The challenge should be as language agnostic as possible, requiring either little or no use of specific libraries, or only the most common of libraries. Try to include only one challenge per answer, so that a vote will correspond to the merits of that challenge alone. Would also be nice if a level of skill required was indicated, and also the rationale behind why it is a useful exercise.

Solutions to the challenges could then be posted as answers to a "How to..." question and linked to from here.

For example:

  • Challenge - implement a last-in-first-out stack
  • Skill level - beginner
  • Rationale - gives experience of how to reference objects

Answers


Building Skills in Object-Oriented Design is a free book that might be of use. The description is as follows

"The intent of this book is to help the beginning designer by giving them a sequence of interesting and moderately complex exercises in OO design. This book can also help managers develop a level of comfort with the process of OO software development. The applications we will build are a step above trivial, and will require some careful thought and design. Further, because the applications are largely recreational in nature, they are interesting and engaging. This book allows the reader to explore the processes and artifacts of OO design before project deadlines make good design seem impossible."


Need Your Help

Mysql union from multiple database tables

php mysql union

I have a group of databases which have a table with same schema. So, i am doing a UNION on this table to show the records from all databases, which works nice.

About UNIX Resources Network

Original, collect and organize Developers related documents, information and materials, contains jQuery, Html, CSS, MySQL, .NET, ASP.NET, SQL, objective-c, iPhone, Ruby on Rails, C, SQL Server, Ruby, Arrays, Regex, ASP.NET MVC, WPF, XML, Ajax, DataBase, and so on.