This document discusses JavaBeans and their use in both window and web applications. It defines JavaBeans as reusable software components that allow developers to reuse code without understanding inner workings. It provides examples of common reusable components like buttons and text fields. It also describes JavaBean properties as readable and writable attributes accessed via getter and setter methods, and how to declare and access JavaBeans in JSP files using the useBean tag. The document demonstrates how to work with JavaBeans in NetBeans.

1. JavaBeans
(DemoinNetBeans)
Presented by:
Roll No’s: 801331002
801331003
801331004
801331029
Branch: SE

2. JavaBeans
 JavaBeans™ makes it easy to reuse software components.
 Developers can use software components written by others
without having to understand their inner workings.

3. Types of
JavaBeans
1. Window application using JavaBeans.
2. Web applications using JavaBeans.

4. Reuseable
components in
netbeans for
Window
application
 Button
 Labels
 Text Field
 Check Box
 Combo Box
 Radio Button
 ETC.

5. Properties of
javabean
•It may have a number of properties which can be read or written.
•It may have a number of "getter" and "setter" methods for the
properties.

6. Demo In NetBeans

7. Web applications
usingJavaBeans
 By using concrete classes.
 By using library

8. JavaBeans
Properties
 A JavaBean property is a named attribute that can be accessed by
the user of the object.
 A JavaBean property may be read, write, read only, or write only.
JavaBean properties are accessed through two methods in the
JavaBean's implementation class:

9. Methods
Method Description
getPropertyName()
For example, if property name is
firstName, your method name
would be getFirstName() to read
that property.This method is called
accessor.
setPropertyName()
For example, if property name is
firstName, your method name
would be setFirstName() to write
that property.This method is called
mutator.

10. Accessing
JavaBeans:
• The useBean action declares a JavaBean for use in a JSP.
• Once declared, the bean becomes a scripting variable that
can be accessed by both scripting elements and other custom
tags used in the JSP.
• The full syntax for the useBean tag is as follows:
<jsp:useBean id="bean's name" scope="bean's scope"
class=“classname”/>

11. Syntax
elaborated
<jsp:useBean id="bean's name" scope="bean's scope"
class=“classname”/>
“Id” attribute specify the object name.
“Scope” attribute will specify scope of that bean.
eg. Session etc.
“class” attribute specify the package that contains the class and
class name that is used as bean.

12. Demo In NetBeans

13. Demo In NetBeans