Thread Subject: function call from sub class

Hi!
I have an scenario where I need to count the number of object of main class. in sub class e.g., we have 4 classes.i.e. Wall, Room, House and City. City is the main class but it has one property Houses which is array of House object. Same like that Houses is having a property Rooms which is also an array of Room object and Room also have a property named walls which is also an array of wall object.

In my scenario, in walls class I need the total number of House objects present in the City class. How can I solve this problem? Where I have to define a method? I think I have to define a method in City class which returns the total length of the House property array. But how can I call this function in wall class?

Thanks in Advance.
/Hasan

> But how can I call this function in wall class?
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By passing the City object as an argument to the Wall class method that needs this info.