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Before you can go ahead and take the real Sun Java exams, you need to know some of the pitfalls that have plagued several test takers. Here are a few pointer

Do not buy a voucher before you are prepared to take the exam:

Often some candidates like to follow this approach hoping that the purchase of the voucher would force them to learn within a given time period. On the contrary this adds additional pressure to your preparation, since you need to study the objectives before the expiry date. Some candidates have lost money misinterpreting the expiry date on the voucher. Be wary of the MM/DD/YYYY Vs DD/MM/YYYY formats. Which one does your voucher display ?

When the candidates finally find that they have no more time to learn, they post a message on a forum that reads something like ‘I have voucher for exam X for a discount of Y%. Please call me to buy’. Remember, you are a candidate, not a voucher reseller

Sets:

A Set is a collection that contains no duplicate elements. Sets are collections where no two elements are the same, which means that element1.equals(element2) should never return true. Also at most one element in a set can be null and no more.

A Set. Duplicates are not allowed and at most one null element is allowed

Sorted Sets:

A SortedSet is a set which sorts and maintains the ordering of its elements. Elements will be ordered by their natural ordering or by the use of a Comparator (if the developer provides one). A Comparable interface can help define the ordering for elements. For example a String’s natural ordering will dictate that elements be ordered this way “a”, “b”, “c” etc. The way in which elements are ordered in a Sorted data structure can be redefined by using the Comparator interface.