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Declarations and Access Control - Programming

Q1:

What will be the output of the program? 
public class Test 
{  
    public static void main(String args[])
    { 
        class Foo 
        {
            public int i = 3;
        } 
        Object o = (Object)new Foo();
        Foo foo = (Foo)o;
        System.out.println('i = ' + foo.i);
    }
}

A i = 3

B Compilation fails.

C i = 5

D A ClassCastException will occur.

ANS:A - i = 3

Object o=(Object)new Foo();-->Here object of Class Foo is Created and Converted it into Super Class Object.

Foo foo=(Foo)o;-->Here the object is Converted into Subclass i.e. Foo and Assign to reference foo.
And finally the Value of i=3 is displayed by foo.i