diff --git a/docs/java/collection/Java集合框架常见面试题.md b/docs/java/collection/Java集合框架常见面试题.md
index c664ca8f..42bcf056 100644
--- a/docs/java/collection/Java集合框架常见面试题.md
+++ b/docs/java/collection/Java集合框架常见面试题.md
@@ -384,10 +384,11 @@ public  class Person implements Comparable<Person> {
         // TODO Auto-generated method stub
         if (this.age > o.getAge()) {
             return 1;
-        } else if (this.age < o.getAge()) {
+        }
+        if (this.age < o.getAge()) {
             return -1;
         }
-        return age;
+        return 0;
     }
 }