class TestA { public void start() { System.out.println(”TestA”); } } public class TestB extends TestA { public void start() { System.out.println(”TestB”); } public static void main(String[] args) { ((TestA)new TestB()).start(); } } What is the result?()
- A、 TestA
- B、 TestB
- C、 Compilation fails.
- D、 An exception is thrown at runtime.
正确答案:B
答案解析:有
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