immutable key in java

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https://stackoverflow.com/questions/20212440/immutable-objects-and-hashmap-keys
https://www.thetechnojournals.com/2019/10/why-hashmap-key-should-be-immutable-in.html
https://howtodoinjava.com/java/collections/hashmap/design-good-key-for-hashmap/
https://docs.oracle.com/javase/9/core/creating-immutable-lists-sets-and-maps.htm
https://www.quora.com/Why-should-the-HashMap-key-be-immutable-in-Java
https://www.baeldung.com/java-immutable-maps
https://www.baeldung.com/java-immutable-object
https://wiki.sei.cmu.edu/confluence/display/java/MET11-J.+Ensure+that+keys+used+in+comparison+operations+are+immutable
https://www.youtube.com/watch?v=Y1uGGTrBYKw
https://www.geeksforgeeks.org/create-immutable-class-java/
https://www.javacodemonk.com/can-the-keys-in-hashmap-be-mutable-1d78a9c6
https://guava.dev/releases/23.0/api/docs/com/google/common/collect/ImmutableMap.html
https://coderoad.ru/23165925/%D0%9F%D1%80%D0%B5%D0%BE%D0%B1%D1%80%D0%B0%D0%B7%D0%BE%D0%B2%D0%B0%D1%82%D1%8C-java-util-IdentityHashMap-%D0%B2-scala-immutable-Map
https://en.wikipedia.org/wiki/Immutable_object
https://lkumarjain.blogspot.com/2013/03/why-map-key-should-be-immutable-object.html
https://cupola.gettysburg.edu/cgi/viewcontent.cgi?article=1000&context=tips
https://immutables.github.io/immutable.html
https://projectlombok.org/features/Value
https://coderanch.com/t/670739/java/Immutable-HashMap-Keys
https://newbedev.com/why-are-immutable-objects-in-hashmaps-so-effective
https://habr.com/ru/company/otus/blog/552630/
http://www.javapractices.com/topic/TopicAction.do?Id=29
https://javarevisited.blogspot.com/2010/10/why-string-is-immutable-or-final-in-java.html
https://www.techiedelight.com/mutable-unmodifiable-immutable-empty-map-java/
https://medium.com/swlh/immutability-in-java-26e07406a0eb
https://kotlinlang.org/docs/collections-overview.html
https://github-wiki-see.page/m/brianburton/java-immutable-collections/wiki/Hash-Keys
https://try2explore.com/questions/10424390
https://dzone.com/articles/things-to-keep-in-mind-while-using-custom-classes
https://www.demo2s.com/java/java-interview-question-object-used-as-key-in-hashmap-should-be-immuta.html
https://www.journaldev.com/129/how-to-create-immutable-class-in-java
https://immutable-js.com/docs/v4.0.0-rc.14/
https://docs.scala-lang.org/overviews/collections/maps.html
https://www.java67.com/2014/01/why-string-class-has-made-immutable-or-final-java.html
https://docs.groovy-lang.org/latest/html/gapi/groovy/transform/Immutable.html
https://aws.amazon.com/blogs/developer/introducing-immutable-class-mapping-for-the-enhanced-dynamodb-client-in-aws-sdk-for-java-2-x/
https://github.com/brianburton/java-immutable-collections
https://www.javatpoint.com/mutable-and-immutable-in-java
https://java2blog.com/immutable-class-interview-questions/
https://www.researchgate.net/post/Why_String_is_immutable_in_java
https://vacationjaipur.com/mrpxu/hashmap-in-immutable-class
https://codepumpkin.com/immutable-class-with-mutable-member-fields-in-java/