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This will create an extra object EMPTY along with each object. Will this affect the performance?
– Sp4Rx
Commented Mar 5, 2019 at 0:34
4

Empty is a static field here, so it shouldn't be a problem.
– Martin Tarjányi
Commented Jul 25, 2019 at 17:13
1

@MartinTarjányi but equals() method in java compares instances and not their field values.. you'll need to override equals() and hashCode().
– Tamim Attafi
Commented Jan 15, 2020 at 6:09
4

that's why I used the lombok annotation
– Martin Tarjányi
Commented Jan 15, 2020 at 6:10
I find myself needing to do something similar to the OP’s question and my thoughts turned first to the equals method. I originally thought to have an isEmpty method that compared to a new instance of the class, but I like the idea of using a static final object more. Nice solution!
– Calvin P.
Commented Feb 22, 2023 at 11:51

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