[Caliraj]

Hi chicon,
thanks for the mail.I also have a doubt about the types of inner classes.Some text books also refer them as Nested class while some tell that nested class, anonymous class,static member class and non -static member class are the types of the inner classes.Im totally confused about it.Could you clear this?

[Chicon]

1° Difference between a nested class and an inner class :

Excerpt from this page

Terminology : Nested classes are divided into two categories: static and non-static. Nested classes that are declared static are simply called static nested classes. Non-static nested classes are called inner classes.

2° Difference between local and anonymous inner classes :

Excerpt from this page

There are two additional types of inner classes. You can declare an inner class within the body of a method. Such a class is known as a local inner class. You can also declare an inner class within the body of a method without naming it. These classes are known as anonymous inner classes. You will encounter such classes in advanced Java programming.

3° Summary on this page

Hi Caliraj,

You should browse more often the Java tutorial from the site of the Java creator :
http://java.sun.com/docs/books/tutorial/java/index.html .
There are too small exercices you may try to check your knowledge.

[Caliraj]

Hi,
Thanks for replies .I have started to work on the nested classes.But as they say, once you start working on anything, you also tend to come across various errors/challenges ...Here is my program below :
class static_innerdemo
{
private int a=10;
static class iner
{
void methin()
{
int b=a*10;
System.out.println("Answer is "+b);
}
}
void methout()
{
static_innerdemo.iner obin=new static_innerdemo.iner();
obin.methin();
}
public static void main(String args[])
{
static_innerdemo obout=new static_innerdemo();
obout.methout();
}
}

The advantage of nested class is that it can access members/variables of the top class even if they are Private.But I get an error.Is it because that the variable 'a' of the top class is not static?

[Chicon]

Originally Posted by Caliraj

... Is it because that the variable 'a' of the top class is not static?

Yes !

[Caliraj]

Hi Chico,
Sorry to bother you much ....I was not bale to get proper examples for anonymous classes.Moreover the sun site syas that any inner class within a method body without a name is an anonymous class.But if there is a class outside the method body without a name, it can also be called as an anonymous class I guess...could you recommend a site with apt examples ???
thanks once again

[Chicon]

There is a complete example fully described step by step on this page (The Essence of OOP using Java, Anonymous Classes).

Also, I suggest you to have a look on this page and followings.

I can't better explain.