programming languages Online Quiz - 319

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Given: 11. public class Key { 12. private long id1; 13. private long 1d2; 14. 15. // class Key methods 16. } 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.)

  1. public int hashCode()
  2. public boolean equals(Key k)
  3. public int compareTo(Object o)
  4. public boolean equals(Object o)
  5. public boolean compareTo(Key k)
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