Describe inner classes in java, JAVA Programming

Assignment Help:

Describe Inner Classes in java?

An inner class is a class whose body is described inside another class, referred to as the top-level class. For instance:
public class Queue {

Element back = null;

public void add(Object o) {

Element e = new Element();
e.data = o;
e.next = back;
back = e;

}

public Object remove() {

if (back == null) return null;
Element e = back;
while (e.next != null) e = e.next;
Object o = e.data;
Element f = back;
while (f.next != e) f = f.next;
f.next = null;
return o;

}

public boolean isEmpty() {
return back == null;
}

// Here's the inner class
class Element {

Object data = null;
Element next = null;
}

}
Inner classes may also holds methods. They may not contain static members.

Inner classes within a class scope can be public, private, protected, final, abstract.
Inner classes can also be used inside methods, loops, and other blocks of code surrounded by braces ({}). Such a class is not a member, and thus cannot be declared public, private, protected, or static.

The inner class has access to all the methods and fields of the top-level class, even the private ones.
The inner class's short name might not be used outside its scope. If you absolutely must use it, you can use the fully qualified name instead. (For instance, Queue$Element) Therefore, if you require doing this you should almost certainly have made it a top-level class instead or at least an inner class inside a broader scope.

Inner classes are most useful for the adapter classes needed through 1.1 AWT and JavaBeans event handling protocols. They permit you to implement callbacks. In most other languages this would bo done along with function pointers.


Related Discussions:- Describe inner classes in java

How virtual communities are formed, How virtual communities are formed? How...

How virtual communities are formed? How these are different from other Communities? Give examples. Virtual Communities are interest-based communities. Members along with genera

Define the type casting?, Type casting defines treating a variable of one t...

Type casting defines treating a variable of one type as though it is another type. When up casting primitives as given below from left to right, automatic conversion happens. Bu

Exercise\servletexercise, Ask question # Write a servlet to display a table...

Ask question # Write a servlet to display a table that contains factorials for the numbers from 0 to 10,

Publish subscribe model and p2p model, What is the basic difference among P...

What is the basic difference among Publish Subscribe model and P2P model? Ans) Publish Subscribe model is typically used in one-to-many situation. It is unreliable but very quic

Describe unbalanced arrays, Describe Unbalanced Arrays ? Such as C Java...

Describe Unbalanced Arrays ? Such as C Java does not have true multidimensional arrays. Java fakes multidimensional arrays by using arrays of arrays. This means that it is prob

Need an engineer for flex reporting tool, Need an engineer who has knowledg...

Need an engineer who has knowledge working on Flex Reporting tool. Who knows how data needs to be taken care of from DB, SharePoint, ERP and then process using logic/intelligence u

Describe the if statement in java, Describe the if statement in Java ? ...

Describe the if statement in Java ? All but the most trivial computer programs required to form decisions. They test a condition and operate in a different way based on the out

Create an online multiple choice quiz, Create an online multiple-choice qui...

Create an online multiple-choice quiz using JSP/Servlets technology. The quiz should draw questions from an array of predefined questions (at least fifteen). You should use a meani

Project on image processing, Project Description: Computer vision and Im...

Project Description: Computer vision and Image processing project to extract book title Skills required: Java, C Programming

Explain bios in java language, Explain BIOS in java language? BIOS bas...

Explain BIOS in java language? BIOS basically stand for Basic input/output system it is also called as the system BIOS or ROM BIOS is a de facto standard describing a firmware

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