What do you mean by a bean in java?

Answer 1

java beans provide business logic methods by which we manually call methods such as setter methods and getter methods in a encapsulated way of object oriented programming. Or even we can say these are model components in MVC architecture.

Answer 2

If you know what the Java programming language and runtime are, then you can understand Java beans.

A bean is an ordinary Java class that fits certain simple guidelines about predictable operation:

1. the class has a zero argument constructor;

2. the class is serializable; and

3. each member variable in the class has a public setter and getter method.

Answer 3

Java bean is the class used to create the desired component in a seprate panel and use it when it is needed bejust "Clicking and Draging to Fream"

Here is the example for java bean for file browser

import javax.swing.*;

import java.io.*;

import java.awt.*;

import java.awt.event.*;

import java.io.Serializable;

public class MyBrowser extends JPanel implements ActionListener, Serializable

{

JTextField tfFile;

JButton btnBrowse,btnShow;

JFileChooser fcImage;

JLabel lblImage;

JPanel pnlInput,pnlImage;

File file;

public MyBrowser()

{

fcImage=new JFileChooser("D:/CURRENT/books/java/java/java/jai-applet/jai-applet/");

tfFile=new JTextField(25);

btnBrowse=new JButton("Browse");

btnBrowse.setActionCommand("Browse");

btnBrowse.addActionListener(this);

btnShow=new JButton("Show");

btnShow.setActionCommand("Show");

btnShow.addActionListener(this);

pnlInput=new JPanel(new FlowLayout());

pnlInput.add(tfFile);

pnlInput.add(btnBrowse);

pnlInput.add(btnShow);

lblImage=new JLabel();

pnlImage=new JPanel(new BorderLayout());

pnlImage.add(lblImage,"Center");

setLayout(new GridLayout(1,2));

add(pnlInput);

add(pnlImage);

setSize(400,500);

show();

}

public void actionPerformed(ActionEvent ae)

{

String str=ae.getActionCommand();

if(str.equals("Browse"))

{

fcImage.showOpenDialog(this);

File file=fcImage.getSelectedFile();

tfFile.setText(file.getPath());

}

if(str.equals("Show"))

{

File file=new File(tfFile.getText());

if(file.exists())

{

JPanel f=new JPanel ();

JLabel lbl=new JLabel(new ImageIcon(file.getPath()));

f.setSize(700,800);

f.show();

}

}

}

}

Compile the above program and get the class file

Codeing for mft file

Name: MyBrowser.class

Java-Bean: True

create the jar file and add it to the ide

Answer 4

= JavaBean = (Redirected from JavaBeans)

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Not to be confused with Enterprise JavaBean.

JavaBeans are reusable software components for Java that can be manipulated visually in a builder tool. Practically, they are classes written in the Java programming language conforming to a particular convention. They are used to encapsulate many objects into a single object (the bean), so that they can be passed around as a single bean object instead of as multiple individual objects. A JavaBean is a "Plain Old Java Object" (POJO) that is serializable, has a no-argument constructor, and allows access to properties using getter and setter methods.

Answer 5

A Java Bean is a reusable software component or we can say it as a component model for java. They are used to encapsulate many objects into a single object (the bean), so that they can be passed around as a single bean object instead of as multiple individual objects.

Answer 6

1. No java syntax

-No semicolons or curly braces

-Can manipulate java objects using only XML-compatible syntax

2. Simpler object sharing

Answer 7

The purpose of Java Spring is to be used as an open source application framework. It is used for many purposes such as programming, data access, resource management and remote access.