Creating Hash Codes for your Classes

• Use a prime number as the HASH_MULTIPLIER
• Compute the hash codes of each instance field
• For an integer instance field just use the field value
• Combine the hash codes

  int h = HASH_MULTIPLIER * h1 +h2;
  h = HASH_MULTIPLIER * h + h3;
  h = HASH_MULTIPLIER *h + h4;
  . . .
  return h;