Chapter 1 Introduction to Java

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15 Αυγ 2012 (πριν από 8 χρόνια και 11 μήνες)

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Introduction to Computers and Programming

Using Java

Professor Deena Engel


Sections 1 and 4

Office hours:

Tuesdays & Thursdays 11:00

12:30, Room 526,

2003 Prentice Hall, Inc. All rights reserved. Customized by Deena Engel for the use of this class.

Course Objectives

Upon completing the course, you will understand

Java programming

Primitive data types

Java control flow structure



Java Applets

Course Objectives, cont.

You will be able to

Write, compile and run JAVA programs.

Create and use methods

Develop Java applets

Write interesting projects

Establish a firm foundation on Java concepts

Course Text Book

Introduction to JAVA Programming, Fourth Edition, by Liang,
Prentice Hall

Available at the NYU Bookstore

Book includes a CD
ROM with all programs.

Lectures in PowerPoint format and programs which we write in
class will be posted to the class website

Please keep up with the reading!

Book Chapters to be covered in this class:

Chapter 1 Introduction to Java

Chapter 2 Primitive Data Types and Operations

Chapter 3 Control Statements:

Selection Statements:

If / else statements

Loop statements:

for and while loops

Chapter 4 Methods

Chapter 5 Arrays

Chapter 12: Java Applets

Course Prerequisites


No prior programming experience required (Really!!)

Who should be taking this course:

students who want to switch to a computer science major

students who want to take a computer science minor or a computer
applications minor (

students who are interested in programming

Who should NOT be taking this course

Students trying to get out of taking a math requirement.

This class may be more difficult than the math you are trying to avoid.

You must get a

or better in this class to take further computer
science classes as a major.

Administrative Matters

Course Web Site

Course web site is available at:

Web site contains the following information:

Administrative information

Course Syllabus

Homework assignments

Class notes

Class programs

Sample exams

Compiler instructions

Links to the class mailing list

Class mailing list

First assignment is to join it. Do it today!

Go to following link and and follow the instructions :

All assignments and news

will be sent to the class list

Homework questions should be sent to the list and
answered by students when possible.


For the course, we will be using
JCreator or NetBeans & SUN JDK software
to create, edit, compile and run our JAVA programs

These programs are free and you can download and use them for your home

To download software for home use, follow information posted on course

In order to use JCreator, you need to download the following:

JDK (Java Development Kit)

And, the JCreator IDE (Integrated Development Environment).

Instructions are to be posted for NetBeans as well which runs on both PC
and Mac

You may prefer to download JDK as a step in the downloading of JCreator.
Both of these programs are free.

If you do not have your own computer, the computer labs on campus have this


Your grade will be determined as follows:

First Midterm (20%)

Second Midterm (20%)

Homeworks (20%)

Final Exam (40%)


Ten points

will be deducted for each class day late

With a possible maximum of
30 points

being deducted.

Home works will
not be accepted after the third class

following its due date.

For each assignment that you do not hand in within the time limit, your final
grade will be lowered by one letter grade ( i.e., if you are averaging a B+, but you
have missed 2 home works, your final grade will be B

Submit the program via email to the grader (more on this later)

Buy a few floppy disks:

For you own good you must save all programs on a disk and back them up
on another disk.

Computer crashes or lost programs are not valid excuses for not handing in
an assignment.

A Word About Cheating

For the purposes of this class, cheating is defined as:

Copying all or part of another student's homework, project or exam.

Allowing another student to copy all or part of your homework,
project, or exam.

Discussing homework concepts is fine, but
you must submit your
own work

However … If you work with a partner, you must both tell me and
the grader when the homework is submitted that you worked
together and also note that in the program comments.

If you are caught cheating, you will receive an immediate FAILURE for
the course.

Student Civility

In an effort to make this class enjoyable for

Please be on time to class!

Please do not talk to your friends and neighbors in class!

It disturbs everyone, and makes it hard to concentrate.

If you have a question, just ask me!

Please turn your pagers and cell
phones off!

Getting Help

Whenever you have a question about the course material,

please feel free to drop by during my office hours or write me an email message.

If at any time you feel that you are falling behind or are overwhelmed by the material, please let me
know and I will be very happy to help you.

Help is always available!


Come to my Office Hours

Tuesdays & Thursdays, 11:00


Location: Room 526 Warren Weaver Hall

If you cannot make my office hours, I will be happy to make an
appointment with you at another time.

Option 2:

Write to me or the
class mailing list


See Lab tutor (10 hours a week)
. Hours will be posted on
the course website soon.

Basic Computing information and history

What is a Computer?


Device capable of performing computations and making logical

Computers process data under the control of sets of instructions
called computer programs


Various devices comprising a computer

Keyboard, screen, mouse, disks, memory, CD
ROM, and
processing units


Programs that run on a computer

Hardware Trends

Every year or two the following approximately double:

Amount of memory in which to execute programs

Amount of secondary storage (such as disk storage)

Used to hold programs and data over the longer term

Processor speeds

The speeds at which computers execute their programs

Computer Organization

Six logical units in every computer:

Input unit

Obtains information from input devices (keyboard, mouse)

Output unit

Outputs information (to screen, to printer, to control other devices)

Memory unit

Rapid access, low capacity, stores input information

Arithmetic and logic unit (ALU)

Performs arithmetic calculations and logic decisions

Central processing unit (CPU)

Supervises and coordinates the other sections of the computer

Secondary storage unit

Cheap, long
term, high
capacity storage

Stores inactive programs

Evolution of Operating Systems

Single_user Batch processing

Do only one job or task at a time

Early Operating systems

Manage transitions between jobs (minimizing transition time
between jobs)

Increased throughput

Amount of work computers process


Computer resources are shared by many jobs or tasks (users still
waited a long time for their output)

Timesharing (access computers via terminals)

Computer runs a small portion of one user’s job then moves on to
service the next user

Personal Computers

Personal computers

Economical enough for individual

Popularized by Steve Jobs and Steve Wozniak with the introduction of
the Apple in 1977.

In 1981 IBM introduced the IBM personal computer using “off the shelf”

Distributed computing

Computing distributed over networks

Client/server computing

Sharing of information across computer networks between file servers
and clients
(personal computers)

Programming languages

Three types of programming languages

Machine languages

Strings of numbers giving machine specific instructions





Assembly languages

like abbreviations representing elementary computer operations (translated
via assemblers)





level languages

Codes similar to everyday English

Use mathematical notations (translated via compilers)

grossPay = basePay + overTimePay

Other High
level Languages

level languages


Used for scientific and engineering applications


Used to manipulate large amounts of data


Intended for academic use


Used in Defense Department Applications

Structured Programming

Structured programming

Disciplined approach to writing programs

Clear, easy to test and debug and easy to modify

Structured programming is hard and takes time to master

The Key Software Trend:

Object Technology


Reusable software components that model items in the real world

Meaningful software units

Date objects, time objects, paycheck objects, invoice objects, audio
objects, video objects, file objects, record objects, etc.

Any noun can be represented as an object

More understandable, better organized, and easier to maintain than
procedural programming

Good luck!

Please speak to me if you have questions or comments

Deena Engel (mail to: