Equals() and hashCode() contract in Java?

As z5h says, the statements are equivalent.

As z5h says, the statements are equivalent. For logical conditions x and y, "x implies y" is the same as "! Y implies!

X". "If something is a bus, it's red" is logically equivalent to "if something isn't red, it's not a bus. " This is contraposition.

Should I take what Javadoc says as a material implication, such as eq -> hc. Yes, that's exactly what it's saying: two objects being equal under equals implies their hashcodes must be equal.

Thank you for the clarification! – stoupa Mar 4 at 22:15 3 "If something is a bus, it's red" How british of you :-) – Sean Patrick Floyd Mar 4 at 22:17.

The two statements are equivalent. Put simply: if two hashcodes differ, the objects are definitely different under equals. If two hashcodes are the same, we don't know.(but in many practical cases the objects will be equal).

There is no conflict between these statements, they are equivalent. P: x. Equals(y) q: x.hashCode() == y.hashCode() p implies q not q implies not p.

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