Object-Oriented Programming

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Presentation transcript:

Object-Oriented Programming OO Design Patterns Object-Oriented Programming

Simple SimUDuck app A duck pond simulation game A large variety of duck species swimming and making quacking sounds Examples of duck species: mallards, red head ducks, mandarin ducks Đại học Công nghệ - ĐHQG HN OO Design Pattern

First Solution Đại học Công nghệ - ĐHQG HN OO Design Pattern

Then… ducks need to fly How to change the design? Đại học Công nghệ - ĐHQG HN OO Design Pattern

What about rubber duckies? Đại học Công nghệ - ĐHQG HN OO Design Pattern

What about decoy ducks? Đại học Công nghệ - ĐHQG HN OO Design Pattern

Disadvantage of using inheritance to provide Duck behavior? A. Code is duplicated across subclasses. B. Runtime behavior changes are difficult C. We can’t make duck dances. D. Hard to gain knowledge of all duck behaviors E. Ducks can’t fly and quack at the same time F. Changes can unintentionally affect other ducks What do you think? Đại học Công nghệ - ĐHQG HN OO Design Pattern

Your solution? Đại học Công nghệ - ĐHQG HN OO Design Pattern

Using interfaces? What do you think about this design? Đại học Công nghệ - ĐHQG HN OO Design Pattern

Separate things that vary from things that stay the same Design Principle #1 Separate things that vary from things that stay the same Đại học Công nghệ - ĐHQG HN OO Design Pattern

Separating what varies from what stays the same Đại học Công nghệ - ĐHQG HN OO Design Pattern

Program to an interface not an implementation Design Principle #2 Program to an interface not an implementation Đại học Công nghệ - ĐHQG HN OO Design Pattern

Đại học Công nghệ - ĐHQG HN OO Design Pattern

Examples Đại học Công nghệ - ĐHQG HN OO Design Pattern

Examples Programming to an implementation Programming to an interface/superclass can assign the concrete implementation at run-time Đại học Công nghệ - ĐHQG HN OO Design Pattern

Behavior interfaces and classes Other types of objects can reuse fly and quack behaviors We can add new behaviors w/o modifying any of the existing behavior classes or touching any of the Duck classes that use flying behavior Đại học Công nghệ - ĐHQG HN OO Design Pattern

Behavior interfaces and classes Other types of objects can reuse fly and quack behaviors We can add new behaviors w/o modifying any of the existing behavior classes or touching any of the Duck classes that use flying behavior Đại học Công nghệ - ĐHQG HN OO Design Pattern

Behavior interfaces and classes Other types of objects can reuse fly and quack behaviors We can add new behaviors w/o modifying any of the existing behavior classes or touching any of the Duck classes that use flying behavior Đại học Công nghệ - ĐHQG HN OO Design Pattern

Superclass Duck Đại học Công nghệ - ĐHQG HN OO Design Pattern

Superclass Duck Đại học Công nghệ - ĐHQG HN OO Design Pattern

Duck’s Subclasses Đại học Công nghệ - ĐHQG HN OO Design Pattern

Setting Behavior dynamically How? Đại học Công nghệ - ĐHQG HN OO Design Pattern

Favor composition over inheritance Design Principle #3 Favor composition over inheritance Đại học Công nghệ - ĐHQG HN OO Design Pattern

The pattern Đại học Công nghệ - ĐHQG HN OO Design Pattern

Homework Đại học Công nghệ - ĐHQG HN OO Design Pattern

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