Transcript Introduction to Programming - Southwest Texas Junior College

SWTJC STEM
Welcome to ENGR 2304/COSC 1336
Engineering Programming
Want to be a “Lean, mean programming machine . . .”
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Welcome to ENGR 2304/COSC 1336
Engineering Programming
My name is Dick Whipple
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BSEE, MSEE from UH
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Designed and programmed computers for 25 years
The course, ENGR 2304/COSC 1336 . . .
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Is designed as a first programming course.
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Is widely accepted for transfer.
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Will use Java as the programming language.
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Will focus on engineering problem solving.
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Is WebCT enhanced with lab on Internet.
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Very Important Information
Objectives for Thursday
• Access course on my website
http://tech.swtjc.net/whipple_online/
• Logon to WebCT & this class
http://70.241.209.12/webct/public/home.pl
• Add both links to your favorites!
• Review the syllabus
• Start Assignment 1
• Read Chapter 1-1 of the text, Java Software
Solutions by Lewis and Loftus
• Install JBuilder from CD-ROM
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Class Attendance
• Attend class regularly
• Class begins promptly At 8:00 AM
• Class WebCT enhanced including . . .
• Access to study materials
• Lecture PowerPoints
• Videos
• Other readings
• Complete/submit lab assignments
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Demonstrate Responsibility
• Read and follow instructions to the letter.
• Read and study all assigned “Text Readings”.
• Research the Internet as directed.
• Utilize WebCT as an enhancement to the course.
• Ask questions when you don’t understand.
• Complete work on time and without weak
excuses.
• Take your first steps as a “Professional”!
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Computers Are Not Magic
"There is nothing magic about computers. Any answer that a
computer can arrive at could also be arrived at by a human if
he/she lived long enough, had enough pencils, etc. What's
important to remember is that, regardless of the speed at which a
computation is done, the process is a straightforward, one step at a
time, matter."
"That isn't to say that a person or persons can solve any
problem a computer can. Sometimes temporal (time)
problems are a part of the problem. The numbers which tell
the rockets of a space ship what to do after the first stage lets
go can't take six months for a human to compute with paper
and pencil. If more than a second or so is required, a satellite
may be falling down someone's chimney."
Michael Kennedy and Martin B. Solomon
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Communicating with Computers
"A person who wants to use a computer must learn to be
precise. One does not communicate with a computer by hand
waving and mumbling. A computer can be of service only if it
is instructed carefully and according to preset rules."
Michael Kennedy and Martin B. Solomon
As a student in ENGR 2304, I expect you to follow this
admonition to the letter.
If you are not willing to do so, this class may not be for you!
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Purpose of a Programming
Language
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The purpose of a programming language is to
facilitate communication between humans and
computers.
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Computers are very accurate and fast at following
instructions, but understand only “bits and bytes”.
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Humans know what instructions to give, but cannot
easily give them to computers in “bits and bytes”.
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Computer languages bridge the gap!
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Examples of Programming
Languages
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Java, Visual Basic, & C++ are multipurpose languages.
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Fortran & Aida are scientific languages.
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Cobol is a business language.
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Assembly languages create fast, compact code for 3D
animation and gaming.
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Markup languages like HTML are Internet based.
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Scripting languages like JavaScript perform utility duty.
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History of Java
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Developed at Sun Microsystems in early 1990’s.
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Development team led by James Gosling.
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Originally called Oak and used in embedded
consumer electronic applications.
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In 1995 renamed Java and redesigned for Internet
applications.
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Gained renown as a general purpose programming
language.
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Characteristics of Java
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Simple, modeled after C++ but easier to use
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Object oriented, not procedural.
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Distributed, adaptable to networking environments
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Interpreted, runs on almost all computers
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Robust & reliable; emphasizes error checking & good habits
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Secure, will not damage a computer
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Architecture neutral, platform independent
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Portable, runs without being recompiled
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Performance good though not the fastest
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Multithreaded, performs several tasks at once
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Dynamic, adapts to evolving environment
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Java’s Relationship with
World Wide Web
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HTML is the authoring language for WWW.
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Java programs run from browser.
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Java makes the web environment “smarter”.
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Java adds responsiveness and interactivity.
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Java uses modern GUI interface.
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Java enhances web graphics.
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Java allows the web page to respond to user events.
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Java Development Environments
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Sun Microsystems provides JDK (Java Toolkit)
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JDK is basic and simple, but inefficient as design tool.
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Other environments are better
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NetBeans from Sun
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JBuilder from Borland (we will use this!)
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Visual Café from Webgain
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Visual Age from IBM
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Visual J++ from Microsoft
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IDE NetBeans
NetBeans provides an IDE (Integrated Development Environment)
that is . . .
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Easy to learn
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Simple to use
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Adaptable to user requirements
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Readily navigated to access . . .
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packages
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projects
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programs
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classes
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code elements
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Installing NetBeans
• Download NetBeans from:
http://java.sun.com/javase/downloads/netbeans.html
• Run the “.exe” file
• You’ll be ready to “Run” your first program in not time!.
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Elements of AppBrowser Window
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Types of Java Programs
Application - A stand alone program written with a high
level language such as Java.
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Executed from the computer by a Java interpreter
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Not subject to security restrictions
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Must contain a “main” method
Applet - Special kind of Java program that runs from a web
browser or applet viewer.
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Subject to security restrictions
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Cannot make changes to user’s system
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Cannot read or write files
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Cannot transmit computer viruses
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Java Program Components
Java’s programming components:
Packages - Collection of classes (Programs)
Classes - Collections of data and methods that operate on data
Methods - Collections of statements that operate on
data
Data
Variables - Stores data
Constants - Stores data that doesn’t change
Literals - Explicitly given data
{
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Java Programming Process
1. Create source code.
 Programmer creates source.
 Stores in filename.java .
2. Compile source.
 Converts source code to bytecode.
 Stores in filename.class. (Ready to execute.)
3. Execute bytecode in filename.class.
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Steps to Create a Program
1. Create a Java project.
2. Create a Java application program.
1) Create a new class.
2) Create the main method.
3. Compile and execute – “Run” the application.
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First Program with JBuilder
/*
My First Program
*/
public class HelloWorld
{
public static void main(String[] args)
{
// Declare variables
// Input data
// Process data
// Output Results
System.out.println("Hello World");
}
}
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What to do now?
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Click on “Online Classes” at SWTJC’s homepage.
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Click on “Class Schedule and find this class.
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Link to my homepage and click on ENGR 2304.
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Follow the instructions there for New Students.
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Complete Assignment 1 by Thursday, February 4, 2010.
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