1. Visual and Internet Programming using JAVA
ICT 6007
Visual and Internet Programming using JAVA
Mohammad Tanvir Alam
Lecturer
IICT,BUET
Home page:

2. Feel free to e-mail me anytime
Administrative
Contact
Course Group
Course handout Or
Please join the group to get lecture materials and participate in group discussion
Feel free to me anytime

3. Java How to Program (5th or 6th edition) Deitel & Deitel
Reference
Book
Java How to Program (5th or 6th edition)
Deitel & Deitel
Programming Tools
Java 2 Standard Edition
IDE
JBuilder 7.0 or later
Kawa 4.0 or later

4. Chapter 1
Outline
History of C++ History of Java Java Class Libraries BASIC, Visual Basic, Visual C++, C# and .NET Basics of a Typical Java Environment
Thinking about Objects

5. Machine Languages, Assembly Languages and High-Level Languages
“Natural language” of computer component
Machine dependent
Assembly language
English-like abbreviations represent computer operations
Translator programs convert to machine language
High-level language
Allows for writing more “English-like” instructions
Contains commonly used mathematical operations

6. Compiler VS Interpreter
Compiler convert to whole program to machine language
Interpreter
Execute high-level language programs without compilation line by line

7. History of C++ C++ Objects Evolved from C
Provides object-oriented programming capabilities
Objects
Reusable software components that model real-world items

8. History of Java
Java
Originally for intelligent consumer-electronic devices
Then used for creating Web pages with dynamic content
Now also used for:
Develop large-scale enterprise applications
Enhance WWW server functionality
Provide applications for consumer devices (cell phones, etc.)

9. Java contains class libraries
Java Class Libraries
Classes
Include methods that perform tasks
Used to build Java programs
Java contains class libraries
Known as Java APIs (Application Programming Interfaces)

10. BASIC, Visual Basic, Visual C++, C# and .NET
Beginner’s All-Purpose Symbolic Instruction Code
Visual Basic .NET
Framework Class Library (FLC)
Visual C++
Microsoft Foundation Classes (MFC) C#
C-Sharp
.NET
.NET platform

11. Basics of a Typical Java Environment
Java programs normally undergo five phases
Edit
Programmer writes program (and stores program on disk)
Compile
Compiler creates bytecodes from program
Load
Class loader stores bytecodes in memory
Verify
Verifier ensures bytecodes do not violate security requirements
Execute
Interpreter translates bytecodes into machine language

12. Fig. 1.1 Typical Java environment.
Primary
Memory .
Disk
Editor
Compiler
Class Loader
Program is created in an editor and stored on disk in a file ending with .java.
Compiler creates bytecodes and stores them on disk in a file ending with .class.
Class loader reads .class files containing bytecodes from disk and puts those bytecodes in memory.
Phase 1
Phase 2
Phase 3
Bytecode Verifier
Bytecode verifier confirms that all bytecodes are valid and do not violate Java’s security restrictions.
Phase 4
Interpreter
Interpreter reads bytecodes and translates them into a language that the computer can understand, possibly storing data values as the program executes.
Phase 5
Fig. 1.1 Typical Java environment.

13. Thinking About Objects (cont.)
Reusable software components that model real-world items
Look all around you
People, animals, plants, cars, etc.
Attributes
Size, shape, color, weight, etc.
Behaviors
Babies cry, crawl, sleep, etc.

14. Thinking About Objects (cont.)
Object-oriented design (OOD)
Models real-world objects
Models communication among objects
Encapsulates attributes and operations (behaviors)
Information hiding
Communication through well-defined interfaces
Object-oriented language
Programming in object oriented languages is called object-oriented programming (OOP)
Java