Java Inner class - access to the variables of outer object

Question

If i have a Inner class (not static) example:

public class A {
     int myNumber = 100;

     class B {
     }  

     public static void main(String[] args) {
         A outerObj = new A();
         B innerObj = outerObj.new B();
         System.out.println("i want the access to the variable 
                             myNumber by the innerObject"); 

     }
}

i mean: i would like with the innerObject to reach the outerObject and see the variable myNumber. I can do that just if i'm in a method of the B Class... but i would like everywhere to see the variabile of the outerObj by the inner.... it's possible? if not why?
thanks

There's no variable numb. Please clarify.

MightyPork
– MightyPork

2013-12-07 21:42:33 +00:00
Commented Dec 7, 2013 at 21:42 — MightyPork
– MightyPork, Commented Dec 7, 2013 at 21:42
@MightyPork He probably means myNumber...

Steve P.
– Steve P.

2013-12-07 21:45:48 +00:00
Commented Dec 7, 2013 at 21:45 — Steve P.
– Steve P., Commented Dec 7, 2013 at 21:45
yes i mean myNumber sorry

Giovanni Far
– Giovanni Far

2013-12-07 21:48:41 +00:00
Commented Dec 7, 2013 at 21:48 — Giovanni Far
– Giovanni Far, Commented Dec 7, 2013 at 21:48

Community · Accepted Answer · 2017-05-23 11:49:44Z

1

I assume that you want something like this:

class B
{
   private int getNum()
   {
      return myNumber;
   }

   private void setNum(int x)
   {
      myNumber = x;
   }
}

However, you cannot get access to myNumber from an instance of B, b, by doing b.myNumber. Here's why.

edited May 23, 2017 at 11:49

CommunityBot

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answered Dec 7, 2013 at 21:45

Steve P.

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4 Comments

Giovanni Far Over a year ago

yes thi i know, but i dont want enter in the class b to read the variables of the outer obj... i would to read them directly in the main method or in other method but not of the class b

Steve P. Over a year ago

@GiovanniFar Then you could just read from class A? What you're saying doesn't make sense to me. You want to read the members of A without A, but with a nested class that can only be initialized by A? But you don't want to use methods? Why? If so, you need to access from A.

Giovanni Far Over a year ago

No i mean this: my innerObj points to the outer Obj ok ? there is a way with the innerObj to see the variabiles of the outerObject WITOUHT using the class b so WITHOUT using the class of the innerobj? i would like to know if the innerobj i can see the variable of the outerobj everywhere or just in the class b and why

Steve P. Over a year ago

@GiovanniFar Just in class B, here's why.

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