| > Since Java 8 there is static and default methods in interfaces. That's not relevant to the part of my post that you quoted... I was describing a hypothetical situation where you already have two interfaces, but would like to have functionality that only makes sense for an object that implements BOTH of those interfaces. The only way to do that in Java is to write a THIRD interface that combines the two and then go through and change your implementations to implement that new interface instead of the two separate ones. However, in the bullet point above, I mentioned static methods on traits in Rust, which is different than what static methods on interface in Java are. In Java, a static method on an interface is just a function on the interface, itself. In Rust a trait can declare that an implementing type must have a static method matching the signature. This is because Rust traits are type classes, while Java interfaces are just object interfaces and cannot constrain the implementing type, itself. > Curious, what rust sql query builder are you refer to? I have been mostly using mysql_async (https://docs.rs/mysql_async/latest/mysql_async/), but recently started playing with sqlx (https://github.com/launchbadge/sqlx). I guess "query builder" isn't the right way to describe them, but I'm not sure what else to call them... |