Traits is an incredible feature rust has. Let's go on a journey. Imagine you want to build a typical desktop software. It will go on the internet, it will dance with databases, it will do some heavy processing. All packaged together.
But internet isn't reliable. Choice of a particular database isn't written in stone. Processing too can be done by variety of libraries. This is the standard use case of polymorphism. You want to call the same api functions, but different implementations will be called in the backend, depending on whatever.
Traits allows you to do that in rust. I've never used java, but it's supposed to be similar to interfaces from that world. Let's look at code examples.
trait TraitThing: Debug {
fn show(&self);
