From 6f3f2c90fe9d8d28f9a21c6cb58a769753d1b716 Mon Sep 17 00:00:00 2001
From: Wenweigood <76194364+Wenweigood@users.noreply.github.com>
Date: Tue, 13 May 2025 19:44:03 +0800
Subject: [PATCH 1/2] =?UTF-8?q?=E5=8E=BB=E9=99=A4=E7=A9=BA=E6=A0=BC?=
 =?UTF-8?q?=EF=BC=8C=E4=BC=98=E5=8C=96=E6=A0=BC=E5=BC=8F?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/java/concurrent/java-concurrent-questions-02.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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

From 7980d032650f7edb265eba66308cdde31ba89b8c Mon Sep 17 00:00:00 2001
From: Wenweigood <76194364+Wenweigood@users.noreply.github.com>
Date: Tue, 13 May 2025 19:57:42 +0800
Subject: [PATCH 2/2] =?UTF-8?q?=E9=9B=86=E5=90=88=E8=BD=ACMap=E6=8A=9B?=
 =?UTF-8?q?=E5=87=BA=E5=BC=82=E5=B8=B8=E7=9A=84=E5=B8=B8=E8=A7=81=E6=83=85?=
 =?UTF-8?q?=E5=BD=A2=E6=8F=90=E9=86=92?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 docs/java/collection/java-collection-precautions-for-use.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/java/collection/java-collection-precautions-for-use.md b/docs/java/collection/java-collection-precautions-for-use.md
index cb68403f..9bd3a408 100644
--- a/docs/java/collection/java-collection-precautions-for-use.md
+++ b/docs/java/collection/java-collection-precautions-for-use.md
@@ -134,6 +134,7 @@ public static <T> T requireNonNull(T obj) {
     return obj;
 }
 ```
+> `Collectors`也提供了无需mergeFunction的`toMap()`方法，但此时若出现key冲突，则会抛出`duplicateKeyException`异常，因此强烈建议使用`toMap()`方法必填mergeFunction。
 
 ## 集合遍历