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单项选择题

public class Test { 
public static void add3 (Integer i) { 
int val = i.intValue(); 
val += 3; 
i = new Integer(val);
} 
public static void main(String args[]) { 
Integer i = new Integer(0); 
add3(i); 
System.out.println(i.intValue()); 
} 
}  
What is the result? () 

A. 0
B. 3
C. Compilation fails.
D. An exception is thrown at runtime.

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