1. public interface&e

单项选择题 1. public interface A { 2. public void doSomething（String thing）； 3. } 1. public class AImpl implements A { 2. public void doSomething（String msg） { } 3. } 1. public class B { 2. public A doit（） { 3. // more code here 4. } 5. 6. public String execute（） { 7. // more code here 8. } 9. } 1. public class C extends B { 2. public AImpl doit（） { 3. // more code here 4. } 5. 6. public Object execute（） { 7. // more code here 8. } 9. } Which statement is true about the classes and interfaces in the exhibit？（）: A、 Compilation will succeed for all classes and interfaces.; B、 Compilation of class C will fail because of an error in line 2.; C、 Compilation of class C will fail because of an error in line 6.; D、 Compilation of class AImpl will fail because of an error in line 2.

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