Objects and Classes

Objects and Classes

1. Objects: Things that exist

   • Attributes: Who I am, things about me
     • Gender
     • Height
     • Address
   • Actions: What I can do
     • Skip
     • Jump
     • Run
   • Create objects: Use new followed by contructor

2. Classes: Template to create objects of identical type

   • Class Name: Use PascalNaming
     • UML has class name on top
   • Fields: Variables, can refer to other objects, use camelNaming
     • UML has Fields in middle
   • Methods: Actions, returns something and accepts some number arguments (even 0)
     • Bottom of UML
     • Method Main: Special method allowing class to be invoked.
   • Constructors: All classes have a constructor, creates objects, same name as class

3. Null: Use when a variable doesn't have value