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

Explain nested classes (or outer and inner classes) in java?, In Java not a...

In Java not all classes must be described separate from each other. You may put the definition of one class under the definition of another class. The class inside class is called

Describe about applet security, Describe about Applet Security? The pos...

Describe about Applet Security? The possibility of surfing the Net, wandering across a random page, playing an applet and catching a virus is a fear in which has scared several

Batch file, how to create batch files of java program

how to create batch files of java program

Draw a use case diagram in uml, Extend the given drawing program (the versi...

Extend the given drawing program (the version that allows undo and redo) as follows: a) Allow the user to select font and font size; user should also be able to boldface, underl

What are checked and unchecked exception, What are Checked and UnChecked Ex...

What are Checked and UnChecked Exception? A checked exception is some subclass of Exception (or Exception itself), excluding class RuntimeException and its subclasses. Making a

What is javaserver faces conversion model, A mechanism for converting among...

A mechanism for converting among string-based markup generated by JavaServer Faces UI components and server-side Java objects.

Creating a system to keep track of computer science books, You are part of ...

You are part of a team creating a system to keep track of computer science books that a publisher is producing. Create a UML class diagram for a "computer science book". You must h

For in statement, It is a distinct type of loop, used to iterate through th...

It is a distinct type of loop, used to iterate through the properties of an object or the elements of an array. For instance assume the following statement that loops through th

Write a function that draws a cow , Write a function that draws a cow at a ...

Write a function that draws a cow at a certain location on the screen, and use the function to draw a herd of cows

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