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单项选择题 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.

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