1. public class Boxer1

1. public class Boxer1 {  2. Integer i；  3. int x；  4. public Boxer1（int y） {  5. x=i+y；  6. System.out.println（x）；  7. }  8. public static void main（String[] args） {  9. new Boxer1（new Integer（4））；  10. }  11. }  What is the result？（） 

• A The value “4” is printed at the command line.
• B Compilation fails because of an error in line 5.
• C Compilation fails because of an error in line 9.
• D A NullPointerException occurs at runtime.
• E A NumberFormatException occurs at runtime.
• F An IllegalStateException occurs at runtime.