单选题1. public class A {  2. public void doit() {  3. }  4. public String doit() {  5. return “a”;  6. }  7. public double doit(int x) {  8. return 1.0;  9. }  10.}  What is the result?()A An exception is thrown at runtime.B Compilation fails because of an error in line 7.C Compilation fails because of an error in line 4.D Compilation succeeds and no runtime errors with class A occur.

单选题
1. public class A {  2. public void doit() {  3. }  4. public String doit() {  5. return “a”;  6. }  7. public double doit(int x) {  8. return 1.0;  9. }  10.}  What is the result?()
A

 An exception is thrown at runtime.

B

 Compilation fails because of an error in line 7.

C

 Compilation fails because of an error in line 4.

D

 Compilation succeeds and no runtime errors with class A occur.


参考解析

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