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
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---
 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