Modern Java · interview question
If a value object needs to implement Comparable, what is a best practice to ensure the comparison logic remains consistent?
Multiple choiceHardchapter-7-curatedpremiummodern-javavalue-objects
Answer and explanation
Correct answer
D. Ensure the compareTo method is consistent with equals.
Why
When implementing Comparable, it's essential that the compareTo method is consistent with the equals method. This means that if two objects are considered equal by equals, compareTo should return zero, ensuring consistent behavior across collections and algorithms.
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