Test11：类的高级特性测试题
问题 1 Which of the following statements is (are) true in Java?
I. All of the methods in an abstract class must be abstract. II. All of the methods in an interface must be abstract.
A. I and II B. I only C. None D. II only 答案： D
问题 2 Which of the following statements about Java classes is (are) accurate?
I. A class may have only one parent. II. Two or more classes may share a parent.
A. II only B. I and II C. I only D. None 答案： B
问题 3 Which of the following statements is (are) true in Java?
I. Classes that contain abstract methods must be declared abstract. II. Classes that contain protected methods must be declared abstract.
A. None B. I only C. I and II D. II only 答案： B
问题 4 Which of the following stateme
