Updated src/generic_types_traits_and_lifetimes/traits.md'.

projects/trait_demo/src/lib.rs

@@ -1,5 +1,9 @@
 pub trait Summary {
-    fn summarize(&self) -> String;
+    fn summarize_author(&self) -> String;
+
+    fn summarize(&self) -> String {
+        format! ("（阅读更多来自 {} ......）", self.summarize_author())
+    }
 }
 
 pub struct NewsArticle {
@@ -10,8 +14,8 @@ pub struct NewsArticle {
 }
 
 impl Summary for NewsArticle {
-    fn summarize(&self) -> String {
-        format! ("{}, by {} ({})", self.headline, self.author, self.location)
+    fn summarize_author(&self) -> String {
+        format! ("by {}", self.author)
     }
 }
 
@@ -23,7 +27,7 @@ pub struct SocialPost {
 }
 
 impl Summary for SocialPost {
-    fn summarize(&self) -> String {
-        format! ("{}: {}", self.username, self.content)
+    fn summarize_author(&self) -> String {
+        format! ("@{}", self.username)
     }
 }

projects/trait_demo/src/main.rs

@@ -1,4 +1,4 @@
-use aggregator::{SocialPost, Summary};
+use aggregator::{SocialPost, Summary, NewsArticle};
 
 fn main() {
     let post = SocialPost {
@@ -10,5 +10,18 @@ fn main() {
         retweet: false,
     };
 
-    println!("1 个新帖子: {}", post.summarize());
+    println! ("1 个新帖子：{}", post.summarize());
+
+
+    let article = NewsArticle {
+        headline: String::from("企鹅队赢得斯坦利杯锦标赛！"),
+        location: String::from("美国，宾夕法尼亚州，匹兹堡"),
+        author: String::from("Iceburgh"),
+        content: String::from(
+            "匹兹堡企鹅队再度成为美国曲棍球联盟 \
+            NHL 中的最佳球队。"
+        ),
+    };
+
+    println! ("有新文章可读！{}", article.summarize());
 }