Lecture 8

1. COP3502: Introduction to CIS I Lecture 8

2. imperative programming

3. object-oriented programming

4. objects building blocks of a program cooperate to complete a task by sending messages

5. objects model tangible things cars, schools, dogs

6. objects model conceptual things an event, a job

7. objects model processes finding a path through a maze sorting a deck of cards

8. using already made objects String Math Integer Array

9. objects class “fancy variable”

10. objects properties (“things that describe it”) capabilities (“things it can do”)

11. capabilities (“behavior”) constructor – initialize object command – change an object’s properties query – send an object a message

12. trash can constructor – can create itself commands – add trash, empty yourself query – Lid open or closed? How much trash?

13. properties attributes – things that describe an object components – things that are “part” of an object association – things an object knows about

14. object state set of all object properties

15. objects in java properties – variables capabilities - functions

16. Car properties: make, model, year, color capabilities: turn on, accelerate, brake, roll windows

18. class vs. instance

19. Class “Instances” of Class

20. class Car { String make; String model; int year; String color; void Car() { … } void turnOn() { … } void accelerate() { … } void decelerate() { … } void rollWindows() { … } }

21. class hello{ void main(String[] args) { … } }

22. variables <type> <name> = <value>

23. creating objects <class_name> <name> = new <class_name>() Car prius = new Car();

24. class CarTest { void main(String[] args) { Car myMustang = new Car(); myMustang.make = “Ford”; myMustang.model = “Mustang”; myMustang.year = 1969 myMustang.color = “brown”; myMustang.turnOn(); myMustang.accelerate(); } }

25. class CarTest { void main(String[] args) { Car myMustang = new Car(“Ford”, “Mustang”, 1969, “black”); myMustang.turnOn(); myMustang.accelerate(); } }

26. interface

27. interface LightBulb bulb = new LightBulb();

28. interface LightBulb bulb = new LightBulb(); bulb.turnOn();

29. problem solving with objects