Object-Oriented Programming

Object-Oriented Programming

1. Classes: A blueprint or a template to create objects of identical type. Help programmers create an abstraction of a problem. Ex: class Employee; { / int age; / double salary; / }

   • Objects: a model that resembles a real-life situation to solve your problem.
     • Fields: variables that can be primitives or references to objects
     • when a reference variable has no value, it is a null variable
   • Every class must have a constructor, which is used to build objects

2. Method: define actions that a classes objects or instances can do. A method has a declaration part and body. The return type can be primitive, an object, or void (nothing)

   • A special method is called the method main, which is the entry point into an application