问题:
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.
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?()
● 参考解析
本题暂无解析