Object-Oriented Prgramming

Object-Oriented Prgramming

1. Class

   • Object
     • Fields
       • A field is an attribute or characteristic that an object or class has. This includes the values that the object contains.
       • Ex. age, maxAge, numberOfRows
     • Methods
       • Methods are actions performed by or on the object or class.
       • Ex. getObject, add, main
       • Returns
         • Primitive
         • Object
         • Void
           • Void means the method returns nothing.
     • A object is an instance of a class with specific values assigned to it.
     • Values (data)
       • Null
         • Null refers to when a reference variable does not have a value.
   • A class is a template or blueprint to create objects of the same structures with the same data types.
   • Data Type
     • A data type describes the form certain data will take.
     • Ex. double, int, String
   • Class Name
   • Constructor
     • A constructor is similar like a method and is used to produce an object. However, there is no return value.
     • new
     • new
       • Keyword used before the constructor to create an object.

2. UML Class Diagram

   • A UML Class Diagram is tool used to represent the different classes within a program and their relations to each other. It also details the attributes and methods within each class.