First Task

First Task

1. Object oriented programming (OOP)

   • attributes perform actions
     • attributes - fields
     • actions - methods
       • methods often called functions
   • class determines object
     • all program elements in Java must reside in class
       • 3 components of class
         • class name
           • class className { (class body) }
         • the fields
         • the methods

2. Fields = variables

3. Methods

   • define actions that a class's objects can do
     • declaration part
     • body part

4. constructors

   • min 1 per class
     • or else no objects can be created out of the class
   • no return value
     • not even void

5. UML Class Diagrams

6. null

   • reference does not have value

7. Joyce Xie