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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.
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分类:SCJP程序员认证考试题库
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