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单项选择题 1. class A {  3. public String to String() {  4. return “4”;  5. }  6. }  7. class B extends A {  8. public String toString() { 9. return super.toString() + “3”;  10. }  11. }  12. public class Test {  13. public static void main (String[] args) {  14. System.out.printIn(new B()); 15. }  16. }   What is the result( )?  

A、 Compilation succeeds and 4 is printed.

B、 Compilation …………… is printed.

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

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

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

  • B
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