单项选择题
A. Class A
B. Compilation fails.
C. An exception is thrown at line 2.
D. An exception is thrown at line 6.
E. The code executes with no output.
单项选择题 20. public float getSalary(Employee e) { 21. assert validEmployee(e); 22. float sal = lookupSalary(e); 23. assert (sal>0); 24. return sal; 25. } 26. private int getAge(Employee e) { 27. assert validEmployee(e); 28. int age = lookupAge(e); 29. assert (age>0); 30. return age; 31. } Which line is a violation of appropriate use of the assertion mechanism?()
单项选择题 1. class Exc0 extends Exception { } 2. class Exc1 extends Exc0 { } 3. public class Test { 4. public static void main(String args[]) { 5. try { 6. throw new Exc1(); 7. } catch (Exc0 e0) { 8. System.out.println(“Ex0 caught”); 9. } catch (Exception e) { 10. System.out.println(“exception caught”); 11. } 12. } 13. } What is the result?()
单项选择题 Youwantsubclassesinanypackagetohaveaccesstomembersofasuperclass.Whichisthemostrestrictiveaccessthataccomplishesthisobjective?()