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When should a Java developer choose equals() and hashCode() Contract deliberately?

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Choose equals() and hashCode() Contract whenever you want the code to look more advanced, even if the design gets less clear.Choose equals() and hashCode() Contract mainly when you want to postpone validation and fix problems manually later.Choose equals() and hashCode() Contract only to avoid modeling domain rules explicitly in Java code.Implement both methods when objects act as HashMap keys or HashSet members.

Answer and explanation

Correct answer

D. Implement both methods when objects act as HashMap keys or HashSet members.

Why

Implement both methods when objects act as HashMap keys or HashSet members. Interviewers often ask this to see whether you can connect the concept to real design decisions.

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When should a Java developer choose equals() and hashCode() Contract deliberately?

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