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equal() & hashcode() override (Kathy Sierra)

 
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From K.S.
In the equals() contract you can find
"if you override equals(),override hashCode() as well" but on hashCode() contract nothing about this "override dependency" but On "Collections" tests I found "by contract hashCode() & equals() can't be overridden unles both are overridden".
Is this true :
override equals() => override hashCode() & override hashCode() => override equals()
 
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