Java Introduction

1
Java Introduction

• ???
• Deng-Rung Liu
• 87/7/15

2
Outline

• History
• Why Java?
• Java Concept
• Java in Real World
• Language Overview
• Java Performance!?
• Conclusion

3
History (1/2)

• Consumer electronics technology
• Hardware Software Difference
• Programming language bottleneck
• New Language Solution

4
History (2/2)

• Proposed by Sun Microsystem
• For Consumer Electronics
• Not Only For Consumer Electronics
• New Language ? (Updating)

5
Why Java ? (1/3)

• Language trend (High-Level)
• Object-Oriented world
• Security requirement (Machine To Yourself)
• Internet hot! (Interactive Document)

6
Why Java ? (2/3)

• Applications in the OS(Seldom Using Applications)
• Real World?! Different Platform?! (How to cross
  different platform)
• Write-Once-Run-Anywhere ! (Quickly Development)
• Integrated with new technology

7
Why Java ? (3/3)

• Distributed computing trend (RMI)
• Backward compatibility (Only Related to Java
  Virtual Machine)
• Fit wireless communication (low bandwidth
  required)
• Some news!

8
Java Concept (1/6)

• Java Virtual Machine (JVM)

9
Java Concept (2/6)

• Java Runtime Environment (JRE)

10
Java Concept (3/6)

• 100 Object-Oriented Programming Language
• C-Like grammar
• Different Packages Interfaces

11
Java Concept (4/6)

• Relation between JVM Application
• Interpreter JIT (Just-In-Time Compiler)
• JDK (Java Development Kit) JVM
• Java Version

12
Java Concept (5/6)

• Development Environment JDK Visual J
  Symantec Café
• No pointer in Java (Object Reference)
• No memory management mechanism (Garbage Collector)

13
Java Concept (6/6)

• Java Native Interface (JNI)

14
Java in Real World

• IC Card Machine
• Consumer Electronics
• Very small Hand Computer (Java Chip)
• Will be HOT in Consumer Electronics

15
Language Overview

• Sample Code

16
Java Defect?! (1/2)

• Hardware interface
• Interpreter language performance
• Java bug!?
• Lack OS support

17
Java Defect?! (2/2)

• OS attention
• Not popular language for programmer
• Sun Microsystem

18
Conclusion

• A New Programming Language
• Cross-Platform Implementation
• Java Chip
• Java OS
• Other OS Support
• Project Experience Sharing