This document is a chapter from the book Head First Java that discusses object oriented programming concepts. It covers the differences between procedural and object oriented programming, how object oriented models the real world through classes and objects, and key concepts like subclasses, superclasses, instance variables, and methods. The chapter also explains how to work with classes and objects in Eclipse and provides exercises to help understand compiling classes.

1. Head First Java Chapter 2
Tom Henricksen

2. Object oriented programming
● Procedural vs Object oriented
● Object oriented models real world
● OO is easier to understand
● OO handles memory management
● Procedural is top-down

3. Object oriented programming
● Methods vs procedures
● Objects vs records
● Classes vs modules
● Procedure calls vs messages

4. Object oriented programming
● Super class
● Sub class
● Instance variables
● Methods

5. Eclipse - instance variables

6. Eclipse - instance variables

7. Eclipse - methods

8. Class vs objects
● Class is a blueprint
● Create many objects

9. Class basics
● OO Program easy to extend
● All Java programs are classes
● Class can inherit variables and methods
● Objects use methods to create behavior

10. Be the compiler
● Exercise A
● Exercise B