Objects and Classes

Objects and Classes

1. Objects

   • Attributes (Fields)
   • Actions (Methods)
   • Aka an instance

2. Classes

   • Name
   • Fields
     • Are Variables
     • Can refer to objects
   • Methods
     • Define actions an object can do
     • Have declaration and body
     • Main
       • Provides entry point
   • Constructors
     • Must have at least one
     • Method to construct object
       • Does not have return value

3. Creating Objects

   • new Constructor()

4. Null Keyword

   • When reference variable does not have a value
     • Can test this using the == operator