多选题public class Key { private long id1； private long 1d2； // class Key methods } 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？（）Apublic int hashCode（）Bpublic boolean equals（Key k）Cpublic int compareTo（Object o）Dpublic boolean equals（Object o）Epublic boolean compareTo（Key k）
多选题
public class Key { private long id1； private long 1d2； // class Key methods } 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）
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