Introduction of JSP (Java Server Pages) Lecture # 1 What is java, how its Work !

1. IMRAN DAUD
FOUNDATION UNIVERSITY
RAWALPINDI CAMPUS
Imran Daud
FURC
Web Engineering
Introduction

2. Content to be covered
 HTTP Architecture
 HTML Basics
 Applets
 JSP
 Java Servlets
 Java Scripts

3. Marks Distribution
 Project/Assignment/ Quizes 15%
 Mid Term 30%
 Attendance 5%
 Final 50%

4. Java ABC
Imran Daud
FURC
 High Level language
 What are Java Packages?
 How we use Packages?
 How do we write Java Program?
 How to compile Java program?
 what is .class file?
 How to run Java program?
 Java as OOP
 Java Documentation

5. High level language
Imran Daud
FUIMCS
 Closer to human languages
 They are easier to read, write, and maintain
 Platform independent.

6. Packages?
Imran Daud
FUIMCS
 organizing Java classes into namespaces similar to
the modules.
 Packages stored into JAR files to allow classes to
download faster in group rather then one at a time
 Package contains:
 Classes
 Interfaces

7. How to use Java Packages?
Imran Daud
FUIMCS
 import java.awt.event.*;
 Keyword: import
 Hierarchy of classes.
 Each packages contain different set of classes
 Each class can use protected data member and data
functions directly of other classes within same
package.

8. How to Write java program
Imran Daud
FUIMCS
 Case Sensitive.
 Class based coding.
 Has ‘main’ function.
 class name and file name should be same.
 Objects instantiated in main using new keyword.
 Save file with extension ‘.java’
 Example:

9. Compiling java code in Dos mode
Imran Daud
FUIMCS
 ‘Bin’ folder Path to be defined.
 Use ‘javac’ command to complie.
 javac File_name.java
 After compiling ‘File_name.class’ is generated.

10. What is .class file
Imran Daud
FUIMCS
 Bytecode
 If a file contains more then one classes then a
separate .class file will be generated for each class.
 ‘.class’ file can be run with JVM.

11. How to run java program (Dos shell)
Imran Daud
FUIMCS
 Use ‘java’ command to run .class file.
 Example:
 Java File_name

12. Java as OOP
Imran Daud
FUIMCS
 Java is based on OOP concepts.
 Main feature of OOP is inheritance.
 We inherit classes using ‘extend’ keyword.
Public Class My_prog extends InheritedFile
{
}
 we make objects to access data members or data
functions.

13. Class VS Interface
 ‘extend’ Class whereas ‘implement’ interface
 Class can have instance but interface don’t
 Re-declare ALL functions in interface.

14. Java Documentation
Imran Daud
FUIMCS
 How to use API (Demo)

15. References
Imran Daud
FUIMCS
 en.Wikipedia.org