Intro to Java Programming

Adgenda• Class Introductions• Brief History of Java• Installations

• Java JDK• Eclipse IDE

• High Level Overview of Java Language• Object Orientation Introduction

Class Introductions• Name• Grade• Programming Experience

• Any languages other than java?• Favorite musical artist• What you expect to get from the class.

BRIEF HISTORY OF JAVA

Brief History of Java• Developed at Sun Microsystems by James

Gosling• Initial version was, called Oak, was based on C++

• Released in 1995 • Initial vision was to automate consumer devices

(TVs, cable boxes,VCRs etc.)• Released with the HotJava browser• Designed with a write once run anywhere

concept (Hardware independent)

Brief History of Java

INSTALLATIONS

Installations• Copy the JavaClass directory from the USB

drive to your C drive• Run the java installer (either 32 or 64 bit

depending on your OS)• Extract the eclipse distribution archive into the

JavaClass directory on your C drive• Copy JarClassFinder to the eclipse dropins

directory• Install ObjectAid from the update site

(http://www.objectaid.net/update)

Installations• Expand the JAutoDoc plugin into the eclipse

directory

JAVA OVERVIEW

Java Overview• Object oriented• Two types of java programs

• Standalone• Normal program run on a computer

• Can have a GUI or be headless

• Applet• Run inside a web browser

Java Overview• Anatomy of a java class file

OBJECT ORIENTATION

Object Orientation• What is OO?

• An OO solution categorized into 3 phases• Analysis

• The analysis of a problem that focuses on the problem domain and the discovery of the domain entities and their interactions and relevant state information.

• Design• The process of taking the analysis output and refining and

extending it into a collection of cooperating classes that can be implemented to form a solution to a set of user requirements.

• Programming• An approach that facilitates creation of modular, reusable

components through the use of object oriented concepts.

Object Orientation• OO Concepts

• Abstraction• The identification of the essential characteristics of an

item

• Encapsulation• The grouping of related concepts into one item, such as a

class or component

• Information hiding• The restriction of external access to attributes

• Aggregation• Represents “is part of” or “contains” relationships

between two classes or components

Object Orientation• OO Concepts (Continued)

• Class• A template from which objects are

• Interface• The definition of a collection of one or more operation

signatures that defines a cohesive set of behaviors

• Collaboration• Classes work together (collaborate) to fulfill their

responsibilities

• Message• A message is either a request for information or a request

to perform an

Object Orientation• OO Concepts (Continued)

• Operation• Something a class does (similar to a function in structured

programming)

• Inheritance (Single and Multiple)• Represents “is a”, “is like”, and “is kind of” relationships. 

When class “B” inherits from class “A” it automatically has all of the attributes and operations that “A” implements

• Polymorphism• Different objects can respond to the same message in

different ways, enable objects to interact with one another without knowing their exact type

Object Orientation• OO Concepts (Continued)

• Subclass• If class “B” inherits from class “A,” we say that “B” is a

subclass of “A”

• Superclass• If class “B” inherits from class “A,” we say that “A” is a

superclass of “B”

• Operation• Something a class does (similar to a function in structured

programming)

Object Orientation• OO Concepts (Continued)

• Override• Sometimes you need to override (redefine) attributes

and/or methods in subclasses