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The array does not have 1 element (the 0th)
Where do you give a size/number of dimensions to the aList array? Is the size value > 0?

mHand could pass the value of num to b in b's constructor

To define the variable num only once, remove the "int num" line:


public class A

{
int num; // Remove this line it is a second definition of num


Please edit your code and wrap it in code...