IMC Trading Interview Question
In the Java specification, it is considered good practice to override .equals() and .hashCode() both together. In the context of HashMap, explain why implementing only one of the two instead of both can cause problems. You must consider both cases.
Interview Answer
Anonymous
Oct 26, 2015
If two objects are equal according to the equals(Object) method, then calling the hashCode method on each of the two objects must produce the same integer result.