Prepared by :- Hitesh Parmar
hitesh.parmar915@gmail.com
@i_hiteshparmar
 What is a Java Bean.
 Components and classes with respect to Java Bean.
 Java.Beans(Package).
 The Component and its ...
 “It’s a Component Architecture of Java which allow
you to define the Component ”
 Java Bean is nothing but the Java Cla...
 Java Bean classes follow certain Rule or Condition.
 All java Bean classes must Implement the Serializable
Interface.
...
 Java Bean API makes it possible to write the
component s/w in a java programming language.
 This package will be used d...
 The component is nothing but the group of classes.
 Example:- Jbutton(it’s a component not a class).
 In order to a sw...
 Application developer uses different beans in his
application using the Java Beans.
 You can build two types of Compone...
 Properties
 Event
 Persistence
 Introspection
 Customization
 Discrete, named attributes that determine the
appearance ,behavior and state of a component.
 Accessible programmatical...
 Simple Properties
 Boolean Properties
 Indexed Properties
 1 Simple Properties:-
 Represent a single value.
 The accessor methods should follow standard naming
conventions.
publ...
 2 BooleanProperties:-
 They are simple properties
 The getter methods follow an optional design pattern
public boolean...
 3 Indexed Properties:-
 Represent an array of values
public <PropertyElement> get<PropertyName>(int index);
public void...
 Bound:-
 a bound property notifies other objects when its value
changes
 generates a PropertyChange event with propert...
 Two types of objects are involved:
 “Source” objects.
 “Listener” objects.
 Message sent from one object to another.
...
Event
source
Event
listener
Fire event
Event
Object
Register listener
Sender fires event, recipient (listener) handles
the...
 Persistance
 Your Bean should be able to store its state, which means
there should be the serializable interface.
 Upo...
 Customization
 Using the Bean customization, you can specify what
methods or the properties that you want to expose at ...
 Reflection API
 It helps us to find out what are the contents of the class,
so you can findout what are the methods, co...
 Buttons
 Text Fields
 List Boxes
 Scroll Bars
 Dialogs
BeanBoxToolBoxToolBox BeanBox
Property Sheet
 BDK - Sun
 NetBeans – www.netbeans.org
 Jbuilder - Inprise
 Super Mojo - Penumbra Software
 Visual Age for Java - IB...
Introduction to java beans
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Introduction to java beans

  1. 1. Prepared by :- Hitesh Parmar hitesh.parmar915@gmail.com @i_hiteshparmar
  2. 2.  What is a Java Bean.  Components and classes with respect to Java Bean.  Java.Beans(Package).  The Component and its type in Java Beans.  Useful Terms while Using Java Beans.  Software Components  Visually Manipulated, Builder Tools  Support
  3. 3.  “It’s a Component Architecture of Java which allow you to define the Component ”  Java Bean is nothing but the Java Class.  Example:-  Swing are all the Java Bean component  Component (Button,TextField,Label)
  4. 4.  Java Bean classes follow certain Rule or Condition.  All java Bean classes must Implement the Serializable Interface.  Component may be used by some apllication builder.  A bean has a no argument constructor. Serializing CLASS Class Object Component Object
  5. 5.  Java Bean API makes it possible to write the component s/w in a java programming language.  This package will be used depending upon the need of the Application (based on funcion of bean classes).  Now when its only the use of the property or the Getter & Setter Method at that time you might not even make a use of this package.
  6. 6.  The component is nothing but the group of classes.  Example:- Jbutton(it’s a component not a class).  In order to a swing Button there are whole lot of class are involved to build this Jbutton.  Component is a single Functionality provided by many different classes  Component is a group of classses that interact with eachother to fulfill the single purpose.
  7. 7.  Application developer uses different beans in his application using the Java Beans.  You can build two types of Components. Component GUI based Non GUI based Extends Component
  8. 8.  Properties  Event  Persistence  Introspection  Customization
  9. 9.  Discrete, named attributes that determine the appearance ,behavior and state of a component.  Accessible programmatically through accessor methods.  Accessible visually through property sheets.
  10. 10.  Simple Properties  Boolean Properties  Indexed Properties
  11. 11.  1 Simple Properties:-  Represent a single value.  The accessor methods should follow standard naming conventions. public <PropertyType> get<PropertyName>(); public void set<PropertyName>(<PropertyType> value); Example: public String getHostName(); public void setHostName( String hostName );
  12. 12.  2 BooleanProperties:-  They are simple properties  The getter methods follow an optional design pattern public boolean is<PropertyName>(); Example: public boolean isConnected();
  13. 13.  3 Indexed Properties:-  Represent an array of values public <PropertyElement> get<PropertyName>(int index); public void set<PropertyName>(int index,<PropertyElement> value); public <PropertyElement>[] get<PropertyName>(); public void set<PropertyName>(<PropertyElement>[] values); Example: public Color setPalette(int index); public void setPalette(int index,Color value); public Color[] getPalette(); public void setPalette(Color[] values);
  14. 14.  Bound:-  a bound property notifies other objects when its value changes  generates a PropertyChange event with property name, old value and new value  Constrained:-  an object with constrained properties allows other objects to veto a constrained property value change  Constrained property listeners can veto a change by throwing a PropertyVetoException
  15. 15.  Two types of objects are involved:  “Source” objects.  “Listener” objects.  Message sent from one object to another.  Sender fires event, recipient (listener) handles the event  There may be many listeners.
  16. 16. Event source Event listener Fire event Event Object Register listener Sender fires event, recipient (listener) handles the event
  17. 17.  Persistance  Your Bean should be able to store its state, which means there should be the serializable interface.  Upon the Bean a builder tool should be able to make a reflaction and be able to create an object of your component.  [Ex. Drag and drop a component in to a design area and the builder tool should be able to create the instance of that component and be able to display the property of that bean via reflaction.]
  18. 18.  Customization  Using the Bean customization, you can specify what methods or the properties that you want to expose at rhe run time environment, so such property will be displayed in the propertysheet.  Introspection  Is nothing but a reflection using which the builder tool can display all the events and the properties of the component.
  19. 19.  Reflection API  It helps us to find out what are the contents of the class, so you can findout what are the methods, constructors and variables in the class and you can find out the details in return.  Due to the process of the reflection builder tool can be able to display what are the property of the Component in the property sheet and also provides the details regarding the Events and methods.
  20. 20.  Buttons  Text Fields  List Boxes  Scroll Bars  Dialogs
  21. 21. BeanBoxToolBoxToolBox BeanBox Property Sheet
  22. 22.  BDK - Sun  NetBeans – www.netbeans.org  Jbuilder - Inprise  Super Mojo - Penumbra Software  Visual Age for Java - IBM  Visual Cafe - Symantec Corporation  JDeveloper Suite - Oracle
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