5 ms·

erh no, those in java allow you to do just that. It is one of my favorite features of java. In essence, you get to embed multiple synchronized maps inside a jav

• Ygg2 3y ago
  Still, you get to see all fields from all variants, while Rust variants are more isolated.
• Sharlin 3y ago
  No, Java enums can contain data but do so in a manner orthogonal to Rust enums. Java enums are not sum types; each variant is simply a (`final`) instance of the enum type which, mostly, is just a regular class type with a private constructor so that no other instances can be created. All variants have the same shape and the author of the enum decides what data the variants contain. Rust enums are sum types, which means that each variant can have a totally different shape and contain different data, and it's the user of the enum that supplies the data when they create an instance of a variant. This quintessential use case for sum types not possible with Java enums (although it is now sort of possible with records and sealed traits): enum Result<T, E> { Ok(T), Err(E) }