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 corre
题目
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）