Objects and Classes

Objects and Classes

1. Classes

   • Classes are the templates that are used to create objects
     • For instance a class titles car could create two different objects
       • Car 2
         • color : red
           • license plate : sp33d
             • horsepower : 1000
       • Car 1
         • color : blue
           • license plate : 53jf1j4
             • horsepower : 300
               • although both cars are from the same class (or template) theyy are theyre own object
   • Classes are declared using two pieces of information
     • the class name
       • what the class will be called
       • It is common to capitalize the first letter of every word in a class name
         • for example: ClassName
     • the class body
       • showing what information will be inserted into the class

2. Objects

   • Objects have two featurs
     • actions (fields)
       • for instance the object of a car would have the actions of accelerate, brake, park, etc.
       • Fields are variables that can also refer to objects
         • because of this it is posible that an object can contain other objects
     • attributes (methods)
       • for instance the object of a car would have the attributes color, number of tires, plate number etc.
       • Methods are what define what an objects class is able to do
       • to declare methods:
         • returnType methodName (listOfArguments
           • (the list of arguments can be empty though)
     • both of these are optional as some may have one and not the other, or some objects may have both

3. Also... every class must contain a constructor before creating an object

   • the syntax for the constructor is..
     • constructorName ( ListOfArguments) {
       • [constructor body]
         • }