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A comment on Why databases use ordered indexes but programming uses hash tables. Parent comment
Java itself introduced Objects.hash(Object...) in 1.7 https://docs.oracle.com/javase/7/docs/api/java/util/Objects....
It's never really been an issue at all to implement equals/hashcode, which you're required to do for effectively all Collections-based usage anyway.
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Java itself introduced Objects.hash(Object...) in 1.7 https://docs.oracle.com/javase/7/docs/api/java/util/Objects....
It's never really been an issue at all to implement equals/hashcode, which you're required to do for effectively all Collections-based usage anyway.