First task

First task

1. Object/Instance

   • Do not need to have the details of real-world objects
   • Components
     • Attributes/fields
       • Actions/Methods
   • Class is a blueprint to create object of
     • Classes
       • Components- within a UML diagram each lie within a rectangle separated by lines
         • Class Name
           • Class names capitatize the initial of each word
           • Class delcaration must use keyword class followed by class name: class className {[class body]}
           • the Fields
             • Variables: primitives or references to objects
             • Camel convention: Capitalize the initial of each word,except the first
               • Ex: age, maxAge, numberOfRows
             • The methods
               • Method Main
                 • Provides entry point to an application.
                   • public static void main(String[] args)
                 • To pass arguments to main, type them after the class name. java className arg1 arg2
               • Declaration
                 • returnType methodName (list OfArguments0
               • Define actions that a class's objects can do
               • Capitalize the name of eac word, except the first
       • Constructors
         • Every class must have at least one constructor. Must have the same name as the class
           • constructorName (listOfArguments) {[constructor body]}
   • Create through new Word () ;
     • New is always followed by the constructor of the class.
   • Some reference variables have null vvalues book==null

2. Object Oriented Programming