問題詳情
76.Given: 1. class TestA{ 2. public void start(){System.out.println("TestA")；} 3. } 4. public class TestB extends TestA{ 5. public void start(){System.out.println("TestB")；} 6. public static void main(String[] args){ 7. ((TestA)new TestB()).start()； 8. } 9. } What is the result?
(A) TestA
(B) TestB
(C) Compilation fails.
(D) An exception is thrown at runtime.
參考答案