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Dasaradhi Nidumolu
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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 java.util.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.

The answer is given as A. Will you please explain why not B?
 
Joe Harry
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Dasaradhi Nidumolu wrote: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 java.util.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.

The answer is given as A. Will you please explain why not B?


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