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單項選擇題

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.printIn(foo. i); 
}  
}  
What is the result?()  

A. Compilation will fail.
B. Compilation will succeed and the program will print “3”
C. Compilation will succeed but the program will throw a ClassCastException at line 6.
D. Compilation will succeed but the program will throw a ClassCastException at line 7.

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