Classes and objects
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The document discusses classes and objects in object-oriented programming. It defines classes as blueprints that define attributes and methods, and objects as instances of classes that have a state and behavior. Classes abstract the properties and behaviors of objects through encapsulation. Some key advantages of abstraction using classes are that it provides a less complex view of the system and hides implementation details.
Classes and objects
- 1. Classes and Objects Paul Inventado De La Salle University
- 2. Abstraction Hiding information and implementation through specialized entities Color: White Size: 2.5x1.5 in on() - ... off() - ... Color: White Memory: 4GB # of Songs: 594 play() - ... pause() - ... stop() - ... Color: White Memory: 120GB Processor: Core 2 Duo Graphics: Nvidia 128MB boot() - ... playMovie() - ... shutdown() - ...
- 3. Advantages of Abstraction Less complex view of the system No need to worry about the implementation of another entity Other entities are assumed to work
- 5. Abstract Data Types data structure contains single or multiple information contains a set of operations may be defined by a programmer (user defined data type)
- 6. Classes actual representation of abstract data types in OOP contains attributes and methods attributes properties of the class methods operations of the class serves as a blue print for objects
- 8. Objects instance of a class (follows the blue print provided by the class) uniquely identified by a name (identifier) has a state and behavior state status of the attributes behavior use of the methods
- 9. Classes and Objects Person name gender height weight getName() getGender() getHeight() getWeight() say(String text) walk(int X, int Y) Name: Bruce Wayne Gender: Male Height: 6'2 Weight: 210 lbs getName() say(String text) walk(int X, int Y) ... Name: Joker Gender: Male Height: 6'5 Weight: 191 lbs getName() say(String text) walk(int X, int Y) ... Name: Harvey Dent Gender: Male Height: 6'0 Weight: 182 lbs getName() say(String text) walk(int X, int Y) ...
- 10. Classes and Objects 1)Identify the classes and the objects from the list below 2)Categorize the objects that are instances of a class Wonder Woman UP UST GloriaArroyo Superhero DLSU A1 Spiderman President GeorgeBush Batman Backstreet Boys BoyBand University
- 11. Classes and Objects Paul Inventado De La Salle University