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Java Beans Interview Questions & Answers - Learning Mode
COOLINTERVIEW.COM J2EE INTERVIEW QUESTIONS JAVA BEANS INTERVIEW QUESTIONS QUESTIONS & ANSWERS - LEARNING MODE

Java Beans Interview Questions & Answers - Learning Mode

In computing based on the Java Platform, JavaBeans are classes that encapsulate many objects into a single object (the bean). They are serializable, have a zero-argument constructor, and allow access to properties using getter and setter methods. JavaBeans is an object-oriented programming interface from Sun Microsystems that lets you build re-useable applications or program building blocks called components that can be deployed in a network on any major operating system platform.

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Java Beans Interview Questions & Answers - Learning Mode
Try Java Beans Interview Questions & Answers - Exam Mode
Question: When will JavaBeans be supported on the [fill in the blank] platform/operating system?

Answer: The complete set of JavaBeans APIs are core to Java 2, hence any platform that is fully compatible with Java 2 implicitly supports JavaBeans. Thus, JavaBeans support will be available as soon as this platform/operating system vendor supports Java 2. Source: CoolInterview.com
Question: What is EJB context ?


Answer: A vendor that supplies an EJB container. An object that allows an enterprise bean to invoke services provided by the container and to obtain the information about the caller of a client-invoked method. Source: CoolInterview.com
Question: What is an entity ?


Answer: A distinct, individual item that can be included in an XML document by referencing it. Such an entity reference can name an entity as small as a character (for example, <, which references the less-than symbol or left angle bracket, <). An entity reference can also reference an entire document, an external entity, or a collection of DTD definitions. Source: CoolInterview.com
Question: Are there JavaBeans components available that I can buy today?

Answer: Yes. A large number of companies, both large and small, have announced their plans to deliver JavaBeans-based products. Source: CoolInterview.com
Question: What are externizable interface?

Answer: Use the Externalizable interface when you need complete control over your bean's serialization (for example, when writing and reading a specific file format).
To use the Externalizable interface you need to implement two methods: readExternal and writeExternal. Classes that implement Externalizable must have a no-argument constructor. Source: CoolInterview.com
Question: What is the relationship between Sun's JFCs and JavaBeans?

Answer: The JFC (Java Foundation Classes) is based upon the AWT (Abstract Windowing Toolkit), which has been part of the Java platform from the beginning. JFC effectively adds a richer set of visual elements for building JavaBeans components and applications. See the JFC web site for more information. Source: CoolInterview.com
Question: What is enterprise bean provider ?


Answer: An application developer who produces enterprise bean classes, remote and Interview Questions - Home interfaces, and deployment descriptor files, and packages them in an EJB JAR file. Source: CoolInterview.com
Question: What is enterprise information system ?


Answer: The applications that constitute an enterprise's existing system for handling companywide information. These applications provide an information infrastructure for an enterprise. An enterprise information system offers a well-defined set of services to its clients. These services are exposed to clients as local or remote interfaces or both. Examples of enterprise information systems include enterprise resource planning systems, mainframe transaction processing systems, and legacy database sy Source: CoolInterview.com
Question: What kind of industry support exists for JavaBeans?

Answer: A coalition of industry leaders in component development worked with JavaSoft to create the JavaBeans specification, which was released to the Internet for public comments on September 4, 1996. The "frozen" JavaBeans specification combines the work of Apple, Borland, IBM, JustSystem, Microsoft, Netscape, Rogue Wave, SunSoft and Symantec and many, many others... We're very pleased to see the tools community swiftly embracing JavaBeans by announcing support for JavaBeans in their visual applic Source: CoolInterview.com
Question: What is EJB object ?


Answer: An object whose class implements the enterprise bean's remote interface. A client never references an enterprise bean instance directly. A client always references an EJB object. The class of an EJB object is generated by a container's deployment tools. Source: CoolInterview.com
Question: Write a simple bean program?

Answer: Write the SimpleBean code. Put it in a file named SimpleBean.java, in the directory of your choice. Here's the code:

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

public class SimpleBean extends JLabel
implements Serializable {
public SimpleBean() {
setText( "Hello world!" );
setOpaque( true );
setBackground( Color.RED );
setFore Source: CoolInterview.com
Question: What is Glasgow?

Answer: Glasgow - the code name for add-ins to the JavaBeans specification. It contains following specifications:

* The Extensible Runtime Containment and Services Protocol
* The Drag and Drop Subsystem for the Java Foundation Classes
* The JavaBeans Activation Framework
Source: CoolInterview.com
Question: What is bean customization?

Answer: Customization provides a means for modifying the appearance and behavior of a bean within an application builder so it meets your specific needs. There are several levels of customization available for a bean developer to allow other developers to get maximum benefit from a bean?s potential functionality.

1.By using a property editor. Each bean property has its own property editor. The NetBeans GUI Builder usually displays a bean's property editors in the Properties window. The prope Source: CoolInterview.com
Question: What are the security implications for downloading Beans over the Internet?

Answer: JavaBeans does not add any security features to the Java platform. Rather, JavaBeans components have full access to the broad range of security features that are part of the Java platform. JavaBeans components can be used to build a range of different kinds of solutions from full-fledged Java desktop applications to web-based Applets. Source: CoolInterview.com
Question: Can both Java applets and JavaBeans components use the InfoBus?

Answer: Yes. Source: CoolInterview.com
Question: What is bean persistance property?

Answer: A bean has the property of persistence when its properties, fields, and state information are saved to and retrieved from storage. Component models provide a mechanism for persistence that enables the state of components to be stored in a non-volatile place for later retrieval. Source: CoolInterview.com
Question: What is the serializable class in java beans?

Answer: Any class is serializable as long as that class or a parent class implements the java.io.Serializable interface. Examples of serializable classes include Component, String, Date, Vector, and Hashtable. Source: CoolInterview.com
Question: What are/is Enterprise JavaBeans?

Answer: Enterprise JavaBeans (EJB) is an API specification for building scalable, distributed, component-based, multi-tier applications. It leverages and extends the JavaBeans component model to provide a rich object-oriented transactional environment for developers building enterprise applications.

Enterprise JavaBeans (EJB) technology is the basis of Java 2 Platform, Enterprise Edition (J2EE). EJB technology provides the scalable architecture for executing business logic in a distributed comput Source: CoolInterview.com
Question: Is the InfoBus client side only?

Answer: Yes. InfoBus is typically used to communicate among Beans at the client, and it can also be useful for sharing information among components at a single server site. The initial version of InfoBus is not distributed, and is therefore not intended for transmission of data between clients and servers.

A variety of Java communication services, including JDBC, CORBA, and RMI can be used by InfoBus components for access to distributed data. For example, the ESuite Data Access component is a Bea Source: CoolInterview.com
Question: What is the InfoBus?

Answer: The InfoBus is a compact Java API which allows cooperating applets or Beans, on a Web page or in any other Java application, to communicate data to one another. The InfoBus architecture enables Beans to be categorized as "data providers" and "data consumers". Data providers are Beans whose primary function is to access data from their native store, such as a DBMS, spreadsheet, flat file, Lotus Notes database etc., and to offer data onto the InfoBus.

Data consumers retrieve data from the b Source: CoolInterview.com

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