How to write a Simple Bean?

[The Recruiter]

Hi Friends,
I have done some basic things in Java and now I have turned towards the Java Bean. I am totally new for the Beans. Its like I am kid when you consider the bean. So expecting some help from you. Please tell me how to write a Simple Bean.?? Since I am new to beans, please explain me in details.!!

[Praetor]

I think that before moving to the features or the coding for Java Beans, I think that you should know about the beans in details. Java beans are reusable software components for Java that can be manipulated visually in a builder tool. That means you can use the Beans again and again. This you will understand when you do the coding of the JavaBeans. Beans are used to encapsulate many objects into a single object, so that they can be passed around as a single bean object instead of as multiple individual objects. A JavaBean is a Java Object that is serializable. Hope that you understand the basic things.

[absolute55]

Before doing the Java Beans, you should know much about the Java. Hope that you know enough so that you can go for the beans. The following code will help you to write the code for the beans which is much simple :

import java.awt.Color;
import java.beans.XMLDecoder;
import javax.swing.JLabel;
import java.io.Serializable;

public class BeanDemo extends JLabel 
                        implements Serializable {
    public BeanDemo() {
        setText( "Hello world!" );
        setOpaque( true );
        setBackground( Color.BLUE );
        setForeground( Color.RED );
        setVerticalAlignment( CENTER );
        setHorizontalAlignment( CENTER );
    } 
}

[Zecho]

You should also know about the classes that gets extended while using the beans. The bean class, for example the 'BeanDemo' used in coding of 'absolute55', extends the javax.swing.JLabel graphic component and inherits its properties. Due to which the BeanDemo becomes a visual component. BeanDemo also implements the java.io.Serializable interface. Your bean may implement either the Serializable or the Externalizable interface. Hope that this helps you .!!

[kelfro]

An object class has some rules which are called as conventions about method naming, construction, and behavior. JavaBeans are usual Java classes which adhere to certain coding conventions. The class must have a public default constructor. You should remember the following things while doing the coding :

• You should always implements java.io.Serializable interface.
• You should not provide any argument constructor.
• The coding provides getter and setter methods for accessing it's properties.