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

How does java allocate heap and stack memory?, Each time an object is start...

Each time an object is started in Java it goes into the area of memory named as heap. The primitive variables like double and int are allocated in the stack, if they are local inst

Opengts geozone violation alerts, Opengts Geozone violation alerts Proje...

Opengts Geozone violation alerts Project Description: I am seeking a very reliable, articulate and an experienced Java and MySQL developer to customize the Device Communicati

Describe the life cycle methods of a jsp? , 1. Pre-translated: Before the...

1. Pre-translated: Before the JSP file has been compiled and translated into the Servlet. 2. Translated: The JSP file has been compiled and translated as a Servlet. 3. I

How many static initializers can there, How many static initializers can yo...

How many static initializers can you have ? As many as you want, but the static initializers and class variable initializers are implemented in textual order and may not refer

Display array elements by using for-each loop, Need assignment help , on th...

Need assignment help , on the topic “Demonstrate a console-program” Demonstrate a console-program to create an array of integers and Initialize the array and assign the values i

Threads, programming challenges

programming challenges

Gps and gprs fleet management system, GPS and GPRS fleet management system ...

GPS and GPRS fleet management system Project Description: I want to develop fleet management system Skills required: HTML, PHP, Java, Website Design

Events calendar for existing website, Looking for: responsible, trustworthy...

Looking for: responsible, trustworthy, accountable, and knowledgeable CakePHP developer and web designer with great communication skills. I'm seeking great partnership and if th

How can you performance tune your database?, 1. De normalizes your tables w...

1. De normalizes your tables where required. 2. Proper use of index columns: An index based on numeric parts is more efficient than an index based on character columns. 3. Re

Web application in Java.., 1. Go to www.bytesizebook.com 2. Follow the firs...

1. Go to www.bytesizebook.com 2. Follow the first link: Guide to Web Development with Java 3. Click on Examples tab 4. Go down to Chapter 4 to find all jar folders, packages, class

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