SCJP 1.6版考題 194

Given:
enum Example{ONE, TWO, THREE}

Which statement is true?
 A. The expressions (ONE == ONE) and ONE.equals(ONE) are both guaranteed to be true.
 B. The expression (ONE < TWO) is guaranteed to be true and ONE.compareTo(TWO) is guaranteed to be less than one.
 C. The Example values cannot be used in a raw javautil.HashMap; instead,
    the programmer must use a  java.util.EnumMap.
 D. The Example values can be used in a java.util.SortedSet, 
    but the set will NOT be sorted because enumerated types do NOT implement java.lang.Comparable.

解答

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Ans: A

解說: The expressions (ONE == ONE) and ONE.equals(ONE) are both guaranteed to be true.