"SCJP 1.6版考題 161" 修訂間的差異

於 2013年3月30日 (六) 02:35 的最新修訂

Given:
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.