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From 00:34The Importance of Adhering to the Contract

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From 00:05Equals and Hashcode Contract

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From 00:06The contact here is that you must override hash code in every class that overrides equals

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From 02:11Default Equality Check

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From 01:18Erklärung der equals() Methode

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From 09:29Adding Java Doc to Equals Method

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From 02:50Overriding Equals and Hashcode

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