Inner class....

[nt novel]

Given:
1. public class ThisClass {
2. private String mine = new String("mine");
3. public class ThatClass {
4. public void yourMeth() {
5. //method body
6. }
7. }
8. }
What should you use to instantiate ThatClass from outside its containing class?
A
ThatClass tc = new ThisClass.ThatClass();

B
ThatClass tc = ThatClass.new ThatClass();

C
ThisClass tc = new ThisClass();
ThisClass.ThatClass thc = tc.new ThisClass();

D
ThisClass tc = tc.new ThisClass();
tc.ThatClass thc = new tc.ThatClass();

The Answer given is C.
My argument is the that class is never instantiated... It is only the this class that is instantiated with a ref. to that class....
Any supportive stmts..
Thanks

[Cindy Glass]

I think that you have a typo in C. Shouldn't it read
C
ThisClass tc = new ThisClass();
ThisClass.ThatClass thc = tc.new ThatClass();

[nt novel]

No I havent made any typo..
Unless the answers are themselves typed wrong !!!

[Dave Vick]

the answer itself must be typed wrong. To make an instance of the inner class it should be, as Cindy said:
ThisClass tc = new ThisClass();
ThisClass.ThatClass thc = tc.new ThatClass();
or, all on one line:
ThatClass tc = new ThisClass().new ThatClass();
At least I'm 99% sure that is th right syntax for all on one line. If not someone please correct me.
Dave

[Roopa Bagur]

Isn't it as simple as
ThisClass.ThatCLass = new ThisClass.ThatClass();
Let me know if I am wrong.
Roopa

Originally posted by nt novel:
Given:
1. public class ThisClass {
2. private String mine = new String("mine");
3. public class ThatClass {
4. public void yourMeth() {
5. //method body
6. }
7. }
8. }
What should you use to instantiate ThatClass from outside its containing class?
A
ThatClass tc = new ThisClass.ThatClass();

B
ThatClass tc = ThatClass.new ThatClass();

C
ThisClass tc = new ThisClass();
ThisClass.ThatClass thc = tc.new ThisClass();

D
ThisClass tc = tc.new ThisClass();
tc.ThatClass thc = new tc.ThatClass();

The Answer given is C.
My argument is the that class is never instantiated... It is only the this class that is instantiated with a ref. to that class....
Any supportive stmts..
Thanks

[Dave Vick]

Originally posted by Roopa Bagur:
Isn't it as simple as
ThisClass.ThatCLass = new ThisClass.ThatClass();
Let me know if I am wrong.
Roopa

In your line you're trying to call a method named ThatClass(). To get a new ThatClass object you have to say new ThatClass().
Also in your line above you dont assign it to a variable to hold the new object (I assume that's just a typo). Someone correct me if I'm wrong.
Dave

[Scott Appleton]

Roopa, I believe your answer would be correct (assuming you added an identifier to the left operand) if ThatClass were static.
However, since it is not, it requires an instance of the outer class to serve as a reference. If you need to keep a handle to that reference, you would have to use the corrected code Cindy listed. Otherwise, you could use a single line expression:
ThisClass.ThatClass thc = new ThisClass().new ThatClass();

[koray guclu]

You can check www.geocities.com/korayguclu/
if you want to learn more on inner classes.

[Ravindra Mohan]

Hi Ranchers,
The correct is (c) below:

ThisClass tc = new ThisClass();
ThisClass.ThatClass thc = tc.new ThatClass();

You may verify the result from the best teacher in coding , yeah, I am referring to the Compiler , no marks for guessing that.
Please go through the fol code :

public class ThisClass {
private String mine = new String("mine");
public class ThatClass {
public void yourMeth() {
 // method body  
}
 }

public static void main(String as[]) {
ThisClass tc = new ThisClass();
ThisClass.ThatClass thc = tc.new ThatClass();
}
}

Hope the issue is cleared now.
Ravindra Mohan.