Objects and classes

Objects and classes

1. Java is an object-oriented program.

   • Objects are everywhere; they are living and nonlving.
     • Objects perform actions (methods)

2. Need classes to create objects, they are the blueprint.

   • If Employee object only needs to work and be paid, then the class only needs these two methods.
     • Address getAddress: returns an Address object
   • Consider 3 things: the name, fields, and methods. (Structural order of a UML diagram)
     • Fields are variables
   • Main method is needed. "Public static void main(String [ ] args)"

3. Every class must have at least one constructor. Constructors are like mthods but have no return value.

4. Can use "new" to create an object.