Discussion
Which of these statements about why an element cannot be added to a List<? extends Number> is correct?
Answer: D
The wildcard says the list holds some single unknown subtype of Number, which may be List<Integer> or List<Double>, so an Integer cannot be proven acceptable. Such a list can be read from as Number, which is the usual reason for the bound; a super wildcard is what allows writing.
No comment is present. Be the first to comment.
Loading…
Post your comment
Please log in or register to post a comment.
Examination Categories
- SSC Exams
- Banking Exams
- Teaching Exams
- Civil Services Exams
- Railways Exams
- Engineering Recruitment Exams
- Defence Exams
- State Government Exams
- Police Exams
- Insurance Exams
- Nursing Exams
- Other Government Exams
- NRA CET
- PG Entrance Exams
- Campus Placement
- MBA Entrance Exams
- CUET and UG Entrance
- Judiciary Exams
- Regulatory Body Exams
- Software Development