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.