In the static innrer classes

[Naveen Zed]

I tried to compile the following code

 class A
{
static class B
{
int i=10;
};
};
class Test 
{
public static void main(String[] args) 
{
A.B ob=new A().new B();
System.out.println(ob.i);
}
}
   

Its giving "Qualified new static class" as compiler error message.What is this mean? Cant we instantiate static class?

[Brian Cole]

Sure you can instantiate a static nested class. In this case, just do

A.B ob = new A.B();

[Naveen Zed]

Thank you.Then what does the error mean?

[Joe San]

Hi Above,

What are those semicolons...What do they imply??

class A
{
static class B
{
int i=10;
};
};

[Naveen Zed]

Hi shankar kumar,
Its fine working with semicolons at the end of class or even at the end of methods, That is not worth as much, My problem is another thing regarding to the error message I got there.

[Sanjeev Singh]

Naveen ,
Consider static inner class as a static member of the the enclosing class.Remember the static methods which can be accessed using the ClassName.methodName() syntax.Also the static members of a class are not associated with the instances of the enclosing class.So the syntax

A.B ob=new A().new B();

is incorrect.It should be

A.B ob= A.new B();

Jothi replied
What are those semicolons...What do they imply??

You can add as much as semicolon in the source file both inside and outside the class/interface declaration(if I am not wrong). They will be considered as a null statement.

[Valentin Mone]

none of them compiles to me: A.B ob= A.new B();, nor A.B ob= new A.new B();
what is wrong?

[sentil kumar]

outer class object is never required to access the static member of that class.
so we need not create object for outer class ,to create object for static inner class .

the doubt is why the outer class name is included in the inner class object creation.

to locate the inner class , outer class name just used before inner class name.

we can import the outer class , instead of giving the outer class name before inner class.

inner class file is created like outerclassname$innerclassname.class

[vivid 2006]

Hello Naveen,

I guess this is the meaning of the error

Qualified new of static classes contradict the specification, which requires that the class being instantiated via a qualified class instance creation.

Static nested classes and true inner classes share many common code paths in the compiler, so this kind of oversight is not unexpected and some times this type of innerclasses may cause incorrect compiler code generation.

[James Quinton]

Originally posted by Valentin Mone:
none of them compiles to me: A.B ob= A.new B();, nor A.B ob= new A.new B();
what is wrong?

Do this:
A.B ob=new A.B();

[Naveen Zed]

If that message is for qualified "static member in the class is accessed with instance" ,Then what about the following code "i " is also a static member..right !

class Test
{
static int i=10;
public static void main(String[] args)
{
System.out.println(new Test().i);
}
}
Any way I think static classes are not members.But why they are for? and what they are?