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

Information retrieval from multi-agent system, Information Retrieval from M...

Information Retrieval from Multi-Agent System with Data Mining in Cloud Computing I have proposed one research model on "Information Retrieval during Multi-Agent System with Dat

Give the javascript code output, What is output of the following JavaScript...

What is output of the following JavaScript code? Str="Virtual University of Pakistan"; document.write(str.substring(5,str.length)) ;

What is actionform, An ActionForm is a JavaBean that extends org.apache.str...

An ActionForm is a JavaBean that extends org.apache.struts.action.ActionForm.  ActionForm handles the session state for web application and the ActionForm object is automatically p

#The ArrayList class java, i want a full program with test about the follow...

i want a full program with test about the following: linkedComputers: We will assume that a number of methods are required. These are specified below. String getComputerName() ret

JAVA Cipher Program, Cryptography, the study of secret writing, has been ar...

Cryptography, the study of secret writing, has been around for a very long time, from simplistic techniques to sophisticated mathematical techniques. No matter what the form howeve

Difference between durable and non-durable subscriptions, Point-To-Point (P...

Point-To-Point (PTP). This model permits exchanging messages via queues formed for some purposes. A client can send and receive messages from one or various queues. PTP model is ea

Explain the concept of multi-threaded- java, Explain the concept of Multi-T...

Explain the concept of Multi-Threaded- JAVA Java has a concept of concurrency wired right in to the language itself. This works out more cleanly than languages where concur

Data structure of different delimiters, In this experience you will make th...

In this experience you will make the neophyte Java programmer happy by solving, to a limited extent, an age-old problem in programming:  mismatched delimiters.  As we all know, eve

Area under curves, Write a program to find the area under the curve y = f(x...

Write a program to find the area under the curve y = f(x) between x = a and x = b, integrate y = f(x) between the limits of a and b. The area under a curve between two points can b

Java developer with spring framework prerequisite, Java developer with spri...

Java developer with spring framework prerequisite from anywhere Let me know that you have proven experience in java with spring frame work. Send some sample data and provide inf

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