Object Oriented Programming Basics

• Setting the Mood

• Object Oriented Programming Notions
  • The Big Picture
  • Programs, classes, and objects
    • A program consists of classes
    • Classes might be packaged
    • Classes have static parts and non-static parts
    • Static parts always exist
    • Non-static parts define what objects look like
    • Objects are created with the new operator
    • Classes have methods and data
  • Visibility
    • Objects can always access private parts of their classes and objects created from their class.
  • Data values
    • Data is primitive or reference
    • Data is variable or constant
  • Methods
    • Methods have code and data
    • Methods send messages to each other
  • Program components

• We're Closet OO Programmers
  • Using other classes' (public static) methods
    • Math class methods
      MathFunctions.java
    • Character class methods
      CharGames.java
  • Creating and using objects from other peoples classes
    • Scanner objects
      MetricConversion.java
    • String objects
      HelloWorld.java
    • Arrays
      ArrayRain.java
    • System.out.println(), etc
      HelloWorld.java

Exercises

Exam Style Questions