CS 178:

1
Computer Organization, Compilation, and Eclipse

• CS 178
• Programming with Multimedia Objects
• Aditya P. Mathur
• Professor of Computer Sciences
• Purdue University, West Lafayette
• August 25, 2004

Last update August 23, 2004
2
Learning Objectives

• What is a compiler?

• The compilation process

• Eclipse

3
Basic Computer Organization
4
High Level-Low Level Languages

• A CPUGPUSPU in a computer understands
  instructions coded as only 1s and 0s.

• The language of 0s and 1s is a low level
  language known as machine language.

• Java allows the coding of instructions using
  keywords from English, e.g. applet, class, and
  String.

• Java is a high-level language.

How does a CPU/GPU/SPU understand instructions
coded in Java?
5
Language Translation
Java Program
JVM interprets Java byte code instructions. JVM
instructions are executed by the CPU.
6
Platform Independence
Byte Code
Java Virtual machine
Java Virtual machine
Java Virtual machine
Others
Windows
Unix
OS X
7
Structure of a Java Program
Java Program
Class
One or more classes
Class
Class
.......
Data
Data
Data
Method
Method
Method
Method
Method
Method
Method
Method
Method
Each class contains data and methods.
Data
Instructions
8
Sample Java Programs and Eclipse
Let us examine a few Java programs..small and not
so small!