Interview Questions.

Question 1. Explain Swt And Jface?

Answer :

Standard Widget Toolkit (SWT):

SWT is an open source widget device package for developing rich, green and portable GUI applications. It was initially advanced with the aid of IBM and being maintained via Eclipse Foundation at the side of Eclipse IDE. It is an opportunity to AWT and Swing. To show the elements, it implements the operating device GUI libraries through the use of Java Native Interface. The SWT packages are transportable and particular for every platform.

The want of SWT is to provide a commonplace API for accessing distinct working machine / platform particular widgets. The goal for designing of SWT is high performance, native OS look and experience, and platform integration. Swing however, designed to permit for a especially customizable look and experience that is common throughout special platforms.

JFace:

A User Interface mission evolved by means of Eclipse to handle most normally used User Interface responsibilities. It is window based gadget independent in both implementation and API. It is designed to work with SWT. JFace is blanketed with pix, text, dialog, wizard, pix, font registries and development reporting for long walking operations.

JFace has  mechanisms – particularly motion and viewing.

The mechanism of actions allows the instructions to be described independently by using the consumer from the exactness of whereabouts within the User Interface.

The mechanism of viewing is based totally on the adapters for positive SWT widgets, which simplifies the software presentation statistics established with lists, tables or trees.

Eclipse runtime kernel is connected with few training that have JFace. It can be a commonplace practice to extract JFace and SWT for use for stand-by myself java applications which is not based totally at the Eclipse runtime.

Question 2. What Is Imageregistry?

Answer :

The mapping among symbolic photo names and SWT photo items is maintained via the ImageRegistry class until the SWT photo gadgets are wished. It owns all of the pics registered with it and mechanically disposes them while the SWT Display that creates the pics is disposed.

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Question 3. Explain The Components Offered By Jface?

Answer :

ImageRegistry:

The mapping between symbolic photograph names and SWT photo items is maintained by way of the ImageRegistry magnificence until the SWT picture objects are needed. It owns all the photographs registered with it and mechanically disposes them when the SWT Display that creates the snap shots is disposed.

FontRegistry:

The FontRegistry maps among symbolic font names and SWT fonts. It owns all of the fonts registered with it and robotically disposes them when the SWT Display that creates the fonts is disposed.

Dialog:

Dialogs are used to speak the facts from the user or to the consumer.

The following are the distinct sorts of messages:

The MessageDialog presentations records to the user
The InputDialog accepts the enter from the consumer in the form of textual content
The ErrorDialog shows one or greater errors to the person.
Wizard:

A wizard can be used to create new java lessons, tasks, documents and folders. Wizards provide grade by grade procedure to create these elements. A well described wizard is targeted to simplify person duties and growth productiveness. Wizard is supposed to take out the hassle of creating repetitive and tedious obligations.

Action Mechanism:

Actions are responsibilities for diverse customers operations such as clicks on menus, toolbars, fame strains and so on. In order to assist those actions the motion mechanism is applied. There are listeners and executives for each of those moves.

Viewers:

Viewers are used to show gadgets the usage of exceptional SWT widgets.

Types of visitors are as follows:

The ListViewer uses the SWT List widget to show the item. A simple listing of factors can be created by way of the use of ListViewer.

The CheckboxTableViewer makes use of the SWT widget to display the objects of checkboxes.

The CheckboxTreeViewer uses the SWT table manage with checkboxes on each node.

The CheckboxTreeViewer makes use of the SWT Tree manipulate with checkboxes on every node.

The TableTreeViewer uses the SWT Table Tree control.

TableViewer, makes use of the SWT TableViewer manipulate.

TreeViewer, makes use of the SWT TreeViewer manage.

Editors: Using JFace Text framework, state-of-the-art editors which include XML editors and textual content editors can be developed. Any utility needs editors to creator the unique code. For example XML document needs tags to be written a flat text file. A application needs editor to creator the code. By the use of extraordinary development template those editors can be plugged in and evolved

Question four. What Is Fontregistry?

Answer :

The FontRegistry maps among symbolic font names and SWT fonts. It owns all of the fonts registered with it and mechanically disposes them while the SWT Display that creates the fonts is disposed.

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Question 5. What Are The Advantages Offered By Swt/jface?

Answer :

Advantages of SWT:

Provides backend by offering local look with backend widgets through supporting Swing programming model.
SWT ought to run Swing local items which permits SWT to run on any Swing guide platform.
SWT primarily based utility loads quicker compared to Swing packages
The reminiscence usage is smaller in SWT as it makes use of the shared libraries. The shared library masses only once for all SWT packages.
Provides the exact platform look and feel. Even with the skinned laptop, it appears and experience is also skinned.
Provides extraordinary patterns for one-of-a-kind varieties of menus
XML Interview Questions
Question 6. Explain The Java Web Start Technology?

Answer :

Java Web Start (JavaWS) technology is a framework which is used to allow the consumer to run java platform unique utility software program directly from the net. The Java Web Start programs do not run in a browser. Web start software gives a series of instructions which offers various offerings to the programs. These instructions are available in the package deal referred to as javax.Jnlp

Web start comes as part of Java Runtime Environment while not having one after the other set up. It accommodates the portability of applets and maintainability of servlets and JSP technology. Java Web Start allows the java purchaser applications to be launched, updated, and deployed from a fashionable net server.

The Java Application Manager characteristic allows the give up-users to organize the java programs and additionally provides distinct options including specifying the use of multiple Java Runtime Environments, setting proxy servers for HTTP.

Question 7. What Is Dialog?

Answer :

Dialogs are used to communicate the statistics from the person or to the consumer.

The following are the different forms of messages:

The MessageDialog shows facts to the user
The InputDialog accepts the input from the user within the shape of text
The ErrorDialog displays one or more errors to the person.
XML Tutorial Core Java Interview Questions
Question eight. Explain The Steps Used To Deploy Swt/jface-based Application With Java Web Start?

Answer :

Some of the working device precise libraries are to be loaded for SWT applications before they can execute. The combination of SWT software with Java Web Start gives effective tools to set up the customer side applications.

To test a Java Web Start application the subsequent are the conditions:

Microsoft Windows XP or Red Hat Linux V8
Java 2 SDK, Standard Edition V1.4 or later
Apache Ant V1.5.3 or later
Apache Jakarta Tomcat V4.1.24 or later
The steps for deploying:

Install the utility in the required listing

Signing the code and protection:

SWT is tightly included with the running device's native windowing environment. SWT uses a system libraries to manage the platform unbiased API and the helping operating device. All the desired JAR files deployed with Java Web Start should be digitally signed. Self-signed take a look at certificate is needed to be created, because the particular software is not going to set up for extensive consumer base.

Creation of self-signed certificate:

Execute the command inside the directory wherein the utility is to be deployed:

keytool -genkey -keystore keystore -alias myself

A prompt message might be displayed pointing out to go into the password,name, locality and so on. During the ANT build technique, the actual signing the JAR files can be completed.

To affirm that the keystore became properly created, kind the subsequent command:

keytool -listing-keystore keystore

Build the record the use of the ANT

a). To easy the surroundings, kind: ant clean

b). To execute the construct method type: ant

Give an ordeal to execute the software using the command: ant run

To installation the software to Apache Tomcat web server:

Place the utility’s .Struggle record into webapps listing underneath Tomcat.
Execute the script to begin Apache Tomcat
Open the internet browser and type http://localhost:8080/index.Html. Now click on Launch application.
Click on Start within the displayed conversation container to start the utility.
Question 9. What Is Wizard?

Answer :

A wizard can be used to create new java instructions, initiatives, files and folders. Wizards provide grade by grade procedure to create those elements. A nicely defined wizard is centered to simplify consumer tasks and increase productivity. Wizard is supposed to take out the problem of creating repetitive and tedious obligations.

JavaServer Faces (JSF) Interview Questions
Question 10. What Is Action Mechanism?

Answer :

Actions are responsibilities for diverse customers operations together with clicks on menus, toolbars, popularity strains etc. In order to guide these moves the action mechanism is implemented. There are listeners and managers for each of those actions.

Core Java Tutorial
Question eleven. What Is Viewers?

Answer :

Viewers are used to display gadgets using distinctive SWT widgets.

Types of viewers are as follows:

The ListViewer uses the SWT List widget to show the item. A simple list of factors may be created through the usage of ListViewer.
The CheckboxTableViewer makes use of the SWT widget to show the gadgets of checkboxes.
The CheckboxTreeViewer makes use of the SWT table manage with checkboxes on each node.
The CheckboxTreeViewer makes use of the SWT Tree manipulate with checkboxes on every node.
The TableTreeViewer uses the SWT Table Tree manage.
TableViewer, makes use of the SWT TableViewer manipulate.
TreeViewer, makes use of the SWT TreeViewer manage.
Design Patterns Interview Questions
Question 12. Explain Editors?

Answer :

Using JFace Text framework, sophisticated editors including XML editors and textual content editors can be developed. Any software desires editors to creator the unique code. For instance XML file desires tags to be written a flat text file. A application desires editor to creator the code. By the usage of specific improvement template those editors can be plugged in and advanced

Web Services Interview Questions
Question 13. Define Autoboxing With An Example?

Answer :

The automated conversion of primitive int kind right into a wrapper class item is known as autoboxing. It does now not require to kind cast the int price. The change of primitive wrapper gadgets is achieved at once.

The following instance illustrates autoboxing:

int wide variety;

Integer intObject;

number = 1;

intObject = 2;

wide variety = intObject;

intObject = wide variety;

JavaServer Faces (JSF) Tutorial
Question 14. Explain The three Mvc Framework Jface Viewer?

Answer :

The JFace viewer framework is an independent module for JFace which wishes a few know-how of SWT. The abstract base instructions for viewers incorporate the framework. The base magnificence is the Viewer that is an extension of a based viewer. The Viewer acts as a widget box. It is the obligation for the content company to respond to the diverse modifications to the model by means of informing the viewer, what to exchange (using add () and get rid of () strategies).

Each viewer registers with the label provider for identifying / notifying the adjustments that could affect the viewers display.

Question 15. Explain The 3 Mvc Framework Jface Text?

Answer :

The JFace textual content gives a framework for the advent and manipulation of text files. IDocument is the essential abstraction for the text model. The content management, role control the usage of portion classes, document partition control, and change notification is supplied by way of this article model.

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