什么是trait？如果了解Java语言的话，你就可以把trait理解为Java的interface接口
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定义
pub trait Summarizable { fn summary(&self) -> String; } -
定义struct
pub struct NewsArticle { pub headline: String, pub location: String, pub author: String, pub content: String } -
实现trait
impl Summarizable for NewsArticle { fn summary(&self) -> String { format!("{}, by {} ({})", self.headline, self.author, self.location) } -
调用
fn main() { let article = NewsArticle { headline: String::from("headline"), location: String::from("location"), author: String::from("author"), content: String::from("content"), }; println!("{}", article.summary()); }