Hi, Angela, 1 and 3 are of course correct, 5 is definitely wrong. As to 2 and 4, since Set interface does not define any new method, it is also correct. It is not the case with List.
So I agree with you, 1, 2 and 3 are correct.
Regards,
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Guoqiao Sun
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Guoqiao Sun<br />SCJP2 SCWCD2<br />Creator of <a href="http://www.jiris.com/" target="_blank" rel="nofollow">www.jiris.com</a>, Java resource, mock exam, forum