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2. Objects everywhere... Real world entities

5. Objects have identity... Our house The neighbour’s cat Hasan’s computer Merhababen Ayse My book Dombo the elephant

6. Objects have state... Red Lying Happy Hooked ill Broken

7. Objects have behavior…. Grrrrrrrr Vroemm Hello, I am John Nice to meet you da da …

10. Objects and Classes Bank Account A class (the concept) John’s Bank Account Balance: $5,257 An object (the realization) Bill’s Bank Account Balance: $1,245,069 Mary’s Bank Account Balance: $16,833 Multiple objects from the same class

16. Object-Oriented Model methods data Object boundary

17. Example: Pencil location direction penDown home up down write

20. Car Objects

22. Class Car Car color speed power drive turn right turn left stop attributes operations class name

23. in Java Car String color int speed int power drive() turnRight() turnLeft() stop() attributes or instance variables methods class name

25. Class Pencil Pencil int location String direction home() up() down() write() attributes methods Name

30. Declaring Objects Class Person ayse; Person String name String birthDate int age getName() getAge … . ayse is of Class

32. Declaring and Creating Objects Class karanfil = new Flower(); Flower karanfil; Flower int age int length int weight getAge() getLength() … . Object instance of refers to karanfil is of Class

35. Example ayse Class Object instance of refers to is of Class ayse = new Person(); Person ayse; ayse.setName( “Ayse Engin“) ; ayse.setAge(24); Person String name String birthDate int age setName(String name) setAge(int age) getName() … . Ayse Engin 24