File: EqualsHashCode.md

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The contract for `Object.hashCode` states that if two objects are equal, then
calling the `hashCode()` method on each of the two objects must produce the same
result. Implementing `equals()` but not `hashCode()` causes broken behaviour
when trying to store the object in a collection.

See Effective Java 3rd Edition ยง11 for more information and a discussion of how
to correctly implement `hashCode()`.