※ 引述《uopsdod (pcman)》之銘言：
: Given:
: enum Exaplme {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 java.utilHash.Map; instead, the
: programmer must use a java.util.EnumMap.
: d. The Example values can be used in a java.tuil.SortedSet, but the set will
: NOT be sorted because enumerated types do NOT implement java.lang.Comparable
:

感謝。 本來以為enum會重在內部自己新定義 < 運算元。

java沒有operator overloading，唯一較特別的只有string +

感謝大家 了解了!

唯「二」比較特別的是String 的 + 和+= :P