Given: 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 boolean equals(Key k)
C:public int compareTo(Object o)
D:public boolean equals(Object o)
E:public boolean compareTo(Key k)
出自:Oracle认证