data class, record и классический POJO
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Данные без поведения — id, метка, время. Kotlin data class и Java record (и старый POJO + Lombok/IDE) убирают одну и ту же рутину: equals, hashCode, toString, доступы. Урок сводит их в ряд: какая версия Java даёт какой короткий путь.
Kotlin: data class
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