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单项选择题 1. class A {  2. public String toString ()  {  3. return “4”;  4. }  5. }  6. class B extends A {  7. public String toString ()   {  8. return super.toString()  + “3”;  9. }  10. }  11. public class Test {  12.   public static void main(String[]args)  {  13.      System.out.printIn(new B());  14.      }  15. }    What is the result?()  

A、 Compilation succeeds and 4 is printed.

B、 Compilation succeeds and 43 is printed.

C、 An error on line 9 causes compilation to fail.

D、 An error on line 14 causes compilation to fail.

E、 Compilation succeeds but an exception is thrown at line 9.

  • B
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