Download Lecture 1

Parts of a Computer
Why Use Binary Numbers?
Source Code - Assembly - Machine Code
Why Java?
Safety
The safety features of the Java language make it possible to run Java
programs in a browser without fear that they might attack your computer.
As an added benefit, these features also help you to learn the language
faster. When you make an error that results in unsafe behavior, you
receive an accurate error report.
Portability
The other benefit of Java is portability. The same Java program will run,
without change, on Windows, UNIX, Linux, or Macintosh. In order to
achieve portability, the Java compiler does not translate Java programs
directly into CPU instructions. Instead, compiled Java programs contain
instructions for the Java virtual machine, a program that simulates a real
CPU. Portability is another benefit for the beginning student. You do not
have to learn how to write programs for different platforms.
Java Versions
A Java Program
the program must have a main method
every Java program has a class
A Java Program
programming languages use reserve words that have
the programmer names the program
special meaning and cannot be used for other purposes
and decides what it should do
this line tells the computer where to display the message
later, we will learn some other options for displaying messages
Another Java Program
line numbers
bookare
uses
used
a different
in book to
style
help
to with
define
descriptions
program blocks
of programs
Another Java Program
Computers can "Do the Math"
Steps in the Development of a Java Program
One Bytecode, Many JVM's
jGrasp
Integrated Development Environment (IDE)
JVM1
this computer
JVM2
that computer
JVM3
mobile device
:
File
Access
Java Source Code
Text Editor
JVMn
the other computer
Program I/O - Compiler Messages
There is a different configuration of the Java Virtual Machine (JVM)
for every platform (type of computer) and Operating System (OS)
Installing NetBeans
The NetBeans Integrated Development Environment (IDE) is available at the
NetBeans Web site:
https://netbeans.org/downloads/7.1/
If the Java Development Kit (JDK) is not already installed on your computer,
you will need to download and install it as well. The JDK is available on the
Oracle Web site:
http://www.oracle.com/technetwork/java/javase/downloads/
The Standard Edition (SE) is preferred for both NetBeans and the JDK.
https://netbeans.org/downloads/7.1/
http://www.oracle.com/technetwork/java/javase/downloads/
don't forget to accept
the license agreement
For Windows OS...
32-bit computers use x86 version
64-bit computers use x64 version
NetBeans IDE 7.4
New Project
Project Name
Writing the Source Code
Installing jGrasp
http://www.jgrasp.org/
http://www.oracle.com/technetwork/java/javase/downloads/index.html
Starting jGrasp
Quick Start
Open - Compile - Run
A New Editor Window in jGrasp
Creating and Saving a Java Program
The Encode / Debug Cycle
Summary
A Textbook for Two Courses
Parts of a Computer
Why Computers use binary numbers.
Source Code, Assembly, and Machine Code
Structure of a Java Program
Java Program Development
Bytecode and the JVM
Installing and Using jGrasp
Encoding and Debugging