Explain the importance of abstract classes in java, JAVA Programming

Assignment Help:

Question:

(a) Explain the importance of abstract classes in Java with an appropriate example.

(b) Explain what is meant by an interface in Java? Use a simple example to illustrate your answer.

(c) A GUI may contain text-fields, buttons, and other labels. A button usually triggers an event on the GUI. Explain the different processes in registering an event and handling the action performed by the button in Java.

(d) Write the code for a GUI which will allow a user to enter two numbers and then compute the product by clicking on a button. The result can be displayed in a text-field or as a label on the GUI.


Related Discussions:- Explain the importance of abstract classes in java

Difference between a scrollbar and a scrollpanel in jsp, A Scrollbar is a C...

A Scrollbar is a Component while Scroll Panel is a Container. A Scroll Panel handles its own events and performs its own scrolling.

What is pop, The Post Office Protocol is an application-level protocol with...

The Post Office Protocol is an application-level protocol within an intranet which is used by the local e-mail clients to send and retrieve e-mails from a remote server those are l

Moving test, After refactor the main class to become abstract class, I want...

After refactor the main class to become abstract class, I want to move test method from tset clas of main class to subclass, how to do that?

I want multiplayer backgammon game, I want Multiplayer Backgammon Game P...

I want Multiplayer Backgammon Game Project Description: We want a multiplayer backgammon as short as well as long one. It should be free and on money also. The games fronted

Help about java code regarding udp, I need to know waht exactly is happinin...

I need to know waht exactly is happining in the following code class Worker implements Runnable { DatagramSocket socket = null; DatagramPacket packet = null; public W

Java, Ask question Write an inheritance hierarchy for classes Quadrilateral...

Ask question Write an inheritance hierarchy for classes Quadrilateral, Trapezoid, Parallelogram, Rectangle and Square. Use Quadrilateral as the superclass of the hierarchy. Create

Automated the claim sub-system, Automated the claim sub-system: Insur...

Automated the claim sub-system: Insurance Domain:       CIA-MI   Type                                         Development - Web-based Application Role

Use array to store values in a program, 1) Listing of the source code ( nam...

1) Listing of the source code ( named Rainfall.java ) for your program 2) Two sample output/execution/runs of your program Optional Group Work: This assignment may be done in

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd