Can two static variables which refer to each other cause an infinite recursion?
public class A
{public static int a = B.b + 1;
}
public class B
{public static int b = A.a + 1;
}
public class MainClass
{public static void Main()
{ Console.WriteLine( "A.a={0}, B.b={1}", A.a, B.b );}
}
Can you explain what would be the output (if any) of the above code without actually running it?
3 comments:
This will not cause an infinite recursion, because initialization expressions will be evaluated just once. The output should be:
A.a=2, B.b=1
1. Static constructor of class A is called.
2. Before the field A.a is initialized, static constructor of class B is called.
3. Field B.b is being initialized. A.a is not initialized and has a default value of 0. It is incremented by 1 and stored in B.b. The field value is now equal to 1.
4. Field A.a is being initialized. B.b is initialized and has a value of 1. It is incremented by 1 and stored in A.a. The field value is now equal to 2.
Why constructor of class B is called first?
Constructor for class B is called first because while passing arguments in the Console.WriteLine, arguments are passed from right to left.
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