diff --git a/docs/java/concurrent/java-concurrent-questions-02.md b/docs/java/concurrent/java-concurrent-questions-02.md
index f3bb411a..40c1b140 100644
--- a/docs/java/concurrent/java-concurrent-questions-02.md
+++ b/docs/java/concurrent/java-concurrent-questions-02.md
@@ -60,7 +60,7 @@ public class Singleton {
     private Singleton() {
     }
 
-    public  static Singleton getUniqueInstance() {
+    public static Singleton getUniqueInstance() {
        //先判断对象是否已经实例过，没有实例化过才进入加锁代码
         if (uniqueInstance == null) {
             //类对象加锁