I'm not familiar with Java. Does it have no notion of structural types at all? I... | Hacker News

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		nicoty on Sept 23, 2024 \| parent \| context \| favorite \| on: Show HN: I Wrote a Book on Java I'm not familiar with Java. Does it have no notion of structural types at all? If it does, maybe you could wrap those fields in `Car` with `Maybe`/`Option` (I’m not sure what the equivalent is in Java) so you get something like `Car(Maybe Make, Maybe Model, Maybe Year, Maybe Colour)`?

vips7L on Sept 24, 2024 | [–]

Records are structural types. Null restricted types are in draft: https://openjdk.org/jeps/8303099

htuyfjsdkfw on Sept 25, 2024 | | [–]

Records in Java are nominal. In fact, it is syntax sugar for a class.

spullara on Sept 23, 2024 | [–]

yes and it is called Optional (rather than Maybe)

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