diff --git a/thread/src/main.rs b/thread/src/main.rs
index 553f06b..90609d8 100644
--- a/thread/src/main.rs
+++ b/thread/src/main.rs
@@ -1,10 +1,20 @@
-use std::thread;
+use std::{ thread, time::Duration, };
 
-// https://zhuanlan.zhihu.com/p/89716165
+// sleep sort
 fn main() {
-    let child = thread::spawn(move || {
-        println!("Hello World!");
-    });
-    let _res = child.join().unwrap();
+    let in_vec = vec![2, 1, 5, 10, 7];
+
+    let mut all_threads = vec![];
+    for i in in_vec {
+        let child = thread::spawn(move || {
+            thread::sleep(Duration::from_millis(i));
+            println!(">> {}", i);
+        });
+        all_threads.push(child);
+    }
+    for t in all_threads {
+        t.join().ok();
+    }
+
     println!("Finished!");
 }