Java认证考试

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. as

题目

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?()  

  • A、 line 21
  • B、 line 23
  • C、 line 27
  • D、 line 29
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