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

Conditional Operators, I need a chart and how this works with java? The fun...

I need a chart and how this works with java? The functions itself.

Write down html or javascript code to declare array, Write down HTML or Jav...

Write down HTML or JavaScript code for the following requirements: Declare an Array along with the identifier SUBJECT having length 5. Assign subsequent values to the array par

Create a general design for a class-implement and test, Objectives 1.  ...

Objectives 1.      To design and implement a simple class. 2.      To write a test program to create instances of your class and demonstrate its behaviour. 3.      To col

What are the different parts of autoproxying, a)  BeanNameAutoProxyCreator ...

a)  BeanNameAutoProxyCreator b) DefaultAdvisorAutoProxyCreator c)  Metadata autoproxying

Javascript, You can declare a variable by the var statement such as: var...

You can declare a variable by the var statement such as: var strname = some value You can also declare a variable with simply assigning a value to the variable. Although, if

Elaborate with examples vector or object oriented graphics, Elaborate with ...

Elaborate with examples Vector or Object oriented graphics? Vector or Object-Oriented Graphics treats everything which is drawn as an object. Objects retain their identity afte

List the precedence table, List the precedence table? At last let's add...

List the precedence table? At last let's add the && , || , & , | and ? operators to the precedence table *, /, % Multiplicative operators +, - Additi

Upload a file in struts? , In JSP page give the code as given below: en...

In JSP page give the code as given below: enctype="multipart/form-data" name="fileForm" scope="session">     Please select file here that you would like to upload:

Advanced java info1414, This is a working program that shows election resul...

This is a working program that shows election results from the infamous 2000 presidential election involving a lot of Floridians and 'hanging chads'. The program as written reads a

What can an applet do, What Can an Applet Do? An applet can: • Draw ...

What Can an Applet Do? An applet can: • Draw pictures on a web page • Create a new window and draw in it. • Play sounds. • Receive input from the user by the keyboard or

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