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Collections and Generics

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Question : 15 of 53

Marks: +1, -0

Given:

1. public class Key {
2. private long id1;
3. private long id2;
4.
5. /* class Key methods*/
6. }

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? (Choose two.)

public int hashCode()
public boolean equals(Key k)
public int compareTo(Object o)
public boolean equals(Object o)
public boolean compareTo(Key k)

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