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CIS 260: App Dev I
IT and Computer Systems

Important changes in information
technology (IT)
– Newspapers  WWW
– Snail mail  email
– Typewriter  _____________
– Brick & mortar  e-commerce

Two major components of a computer
system:
– Hardware: run by software
– Software: created/used by people
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History of Computers

See
http://sunsethigh.dade.k12.fl.us/sunset/history/index.htm

for a good history.
A brief history:
– 1950s: emergence of mainframes
– 1960s: widespread use of mainframes
– 1970s: widespread use of minicomputers
– 1980s: ____ become popular
– 1990s: notebooks, Internet become popular
– 2000s: E-commerce, wireless become
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popular
Tasks Performed by Computers
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Input
– Human (e.g., keypunch, mouse)
– Automated (e.g., barcode, RFID)
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Output
– Human readable
– Non-human readable

Storage
– Primary
– Secondary

Operations
– Arithmetic
– ____________
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Hardware

CPU
– Control unit, arithmetic logic unit, instruction register,
program counter

Main memory
–
–
–
–
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Memory cells with addresses
RAM, ROM
Holds programs and data
Volatile
__________ storage
– Hard disk, floppy disk, CD-ROM, flash drive

I/O
– Input: keyboard, mouse, screen, scanner
– Output: printer, monitor, speaker
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Software

System programs
– Operating system
• Windows Explorer
• Control Panel

Application
programs
–
–
–
–
Word processor
Spreadsheet
Internet browser
ERP (__________
resource planning)
– Games
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Computer Languages

Signals
– Analog: changes are continuous (audio tape)
– _______: changes are discrete, on/off (music
CD)

Computer codes
– Binary digit (bit): a 0 or 1 (off/on), base 2
– Byte: 8 _____ (00000001, 00000010, …)
– ASCII code: 128 characters (27), nearly a
byte
– EBCDIC: 256 characters (28), one byte
– Unicode: 65,536 characters (216), two bytes 7
Programming Languages

Machine languages
– instructions in codes with 0s and 1s
– Depends on type of CPU
– Codes used for memory locations, operations

Assembly languages
– ___________ used for instructions
– 100100 means LOAD, 100101 means ADD
– Assembler translates AL to ML

High-level languages (C, C++, Java)
– Compiler converts Java to bytecode
– ________ (JVM) converts bytecode to ML
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Processing a Java Program

Programmer creates ______ code in an editor
– Type the Java code as a text file
– Save the text file as <ClassName>.java

Compile the source code into __________
– Source code MUST follow Java syntax
– Compiler creates the bytecode in
<ClassName>.class

Link the bytecode to other programs
– The Java library contains additional programs
– A linker links your bytecode to create executable
code

Run the executable program
– Loader loads executable into main memory
– __________ translates executable code into ML
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Programming Process

Java Integrated
Development
Environments (IDE’s)
–
–
–
–

Forte
JBuilder
NetBeans
BlueJ
Programming Aids
– Flowcharts: graphic
– ____________: textual,
non-executable
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Programming Methodologies

Structured programming
– Divide a problem into procedures
– Use basic programming structures
• Sequence: do A, do B, do C, …
• Selection: if…then
• Loop: automated repetition

________-oriented programming (OOP)
– Represent a problem as interacting objects
– Determine the objects’ attributes
– Determine the objects’ behaviors
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Introduction to Java






Java was created in 1996 by _______.
JDK is the Java _________, where “JDK”
stands for __________ Development Kit.
Java syntax is similar to that of _______.
Java was designed to run on any
computer _________ (i.e., combination of
operating system and microprocessor).
Java applications run slightly _______
than most others.
Java handles internal memory overhead
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______________.
Applications, Applets, & Servlets




Java can be used to create
____________ that often have a GUI
(_________ user interface).
Java can be used to create web-based
applications called __________.
A Java server-side application is called a
__________.
You can copy the applications from the
text CD by running the
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OO_Java_Source_Code.zip file.
How Java Compiles & Interprets




You can use a text ________ to create
Java ________ code (.java file extension).
The Java __________ converts the
source code into Java _________.
A platform that has a Java __________
(a.k.a. a Java _______ machine or JVM)
can translate the bytecodes into the
processor’s (machine) language.
A web browser with a Java interpreter can
download and run Java ________.
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Installing the JDK

Using the CD that comes with the text,
– Simply navigate to the Java folder (in the
Software folder), double-click the .exe file.
– Follow the prompts.

Using the www.java.sun.com web site,
– Select the download link for Java SE
(Standard Edition).
– Download (can take a long time and can
contain errors).
– Run the .exe file and follow the prompts.
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Directories & Files of the SDK

In the c:\jdk1.6.x directory,
– bin contains the Java _________ and other
necessary tools for developing and testing
– demo contains sample applications and
________
– include contains header files for using ____
code in Java applications
– jre contains the Java __________ or Java
Runtime Environment
– lib contains libraries and support files
– doc contains _____________
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To Configure Windows




Select Start, Settings,
Control Panel.
Select System,
Advanced tab, and
Environment
Variables button).
Select Path under
System variables,
Edit…
At the end of the
current path, enter a
“;” and add
c:\jk1.6.x\bin\ (replace
x with the current #)

If the system has a
classpath variable,
add “;.;” at the end.
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Creating a Java Program


Run Notepad (Start, Programs, Accessories,
Notepad).
Enter Java code (exactly), such as
public class MyFirstJavaProgram {
public static void main( String[ ] args )
{
System.out.println(“Hello world!”);
}
}


Remember!!! Java is ______-sensitive.
Save the file as “MyFirstJavaProgram.java”,
say, in a folder called “first” on the a:\ drive (use
the quotes on the file name).
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Compiling and Running


Run the Command Prompt (Start,
Programs, Accessories, Command
Prompt).
To ________, at the C:\> prompt, enter
the following:
a:
javac \first\MyFirstJavaProgram.java

To _____, at the A:\> prompt, enter the
following:
cd\first
java MyFirstJavaProgram
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Errors



You may get compile-time errors or runtime errors.
The JDK will provide the line _______ of
the error, a description, and the actual
code that is in error.
You will need to go back to _________ to
correct the errors, recompile, and rerun.
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Creating a Java File w/ TextPad


TextPad is a text _______ designed for Java.
To install TextPad go to
http://www.textpad.com/download/index.html#downloads
and select English, FTP (USA)
 To run TextPad…
– click Start, Programs, TextPad

To create a Java program…
–
–
–
–
enter Java code
select File, Save As…
enter the file name (matches the class name)
select Java as file type, OK.
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To Compile and Run w/ TextPad

To compile…
– Select Tools, Compile Java (or Ctrl+1)

To run…
– Select Tools, Run Java Application (or Ctrl+2)

To view line numbers of code…
– Select Configure, Preferences, View

What’s wrong with using a complex IDE
(___________ Development
Environment) in an introductory course?
– Interferes with learning how to write pure
Java code
– Wastes precious time learning the IDE
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