4003-707-02 Advanced Programming
Module 1. Objects -- Lecture Notes

Hello World

• The "Hello world" program in Java
  • Java main programs
  • Source file name requirements
  • Use of objects in the "Hello world" program

• Java program development
  • Editing
  • JDK documentation; Javadoc
  • Compiling
  • Running
  • JDK 1.5, JDK 1.6

• Coding style

Object Concepts

• Everything's an object
  • (Except things like integers, characters, etc.)
  • A string is an object
  • An array is an object

• An object has state, behavior, and identity -- Grady Booch

• An object is an instance of a class, or type
  • (Except for primitive types)
  • A string is an instance of class java.lang.String
  • An array is an instance of an implicit array class

• A class is a member of a class hierarchy
  • A class extends a superclass or base class
  • The ultimate base class: java.lang.Object
  • A class may have subclasses

• Class hierarchy for java.io.PrintStream

• Class hierarchy for java.util.LinkedList
  • Generic classes

• An object is created by a constructor
  • Returns a reference to the new object

• An object is never explicitly destroyed
  • Objects for which all references have gone away are automatically destroyed by the garbage collector

Today's Date Is

• The "Today's date is" program in Java
  • Importing classes
  • Use of constructors
  • The toString() method

• Variations
  • Use of temporary variables
  • Use of methods to extract information from an object -- information hiding
  • Use of string concatenation

Javadoc

• Class comments

• Method comments

• The javadoc compiler

Advanced Programming • 4003-707-02 • Fall Quarter 2008

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Alan Kaminsky • Department of Computer Science • Rochester Institute of Technology • 4486 + 2220 = 6706

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Copyright © 2008 Alan Kaminsky. All rights reserved. Last updated 02-Sep-2008. Please send comments to ark­@­cs.rit.edu.