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多项选择题 A programmer is developing a class Key, that will be used as a key in a standard java.util.HashMap.   Which two methods should be overridden to assure that Key works correctly as a key?()

A、public int hashCode()

B、public void hashCode()

C、public int compareTo(Object o)

D、public boolean equals(Object o)

E、public boolean compareTo(Key k)

  • A,D
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