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

Help, I can''t figure out how to do this question: "Given two linear equati...

I can''t figure out how to do this question: "Given two linear equations: ax + by + c = 0 and dx + ey + f = 0" solve for x and y. A, b, c, d, e, and f being inputted from the user.

Explain system colors in java 1.1, Explain System Colors in java 1.1? I...

Explain System Colors in java 1.1? In Java 1.1, the java.awt.SystemColor class is a subclass of java.awt.Color that gives color constants in which match native component colors

Explain the essential api concepts associated with j2me, Question : (a)...

Question : (a) Class file verification in CLDC is different from class file verification in J2SE. Explain and discuss how and why it is different, illustrating your answer

What is the use of wrapper class, What is the use of Wrapper class You...

What is the use of Wrapper class You can create an object of Wrapper class using a String or a primitive data type Integer num = new Integer (4); or Integer num = n

Inheritance, Draw an inheritance hierarchy to represent a shoe object. The...

Draw an inheritance hierarchy to represent a shoe object. The base class should have derived classes of Dress Shoes, Tennis Shoes and Boots.

Instance of a SyntaxTree object is null. I don''t know why.?, I have been w...

I have been working on my compiler''s parser now. And for some reason i cant make my parse tree printer to work. SyntaxTree keeps on showing as null when i invoke the print() metho

A service locator, J2EE prepares use of the JNDI interface to access differ...

J2EE prepares use of the JNDI interface to access different resources like JMS, JDBC, EJB etc. The client finds up for these resources through the JNDI look-up. The JNDI look like

What are application softwares, What are application softwares? List down t...

What are application softwares? List down the names of three application software's. Definition: Application Software are in which software then can interact directory along

Differentiation between a vector and an array, Differentiation between a V...

Differentiation between a Vector and an array . Explain in Brief about the pros and cons of both?

Concept of events and events listeners and events handlers, Question: (...

Question: (a) State and explain clearly FIVE new features of Actionscript 3.0 as compared to Actionscript 2.0. (b) Explain clearly the concept of events and events listen

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