From 0e0eb9c628ccbf9ba36cf268119f9f5b55e94ed1 Mon Sep 17 00:00:00 2001
From: Chart <hanchaozheng@yahoo.com>
Date: Tue, 15 Nov 2022 14:50:57 +0800
Subject: [PATCH] doc: Update java.md (#80)

---
 docs/java.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/docs/java.md b/docs/java.md
index 4a7cbe4..8235b72 100644
--- a/docs/java.md
+++ b/docs/java.md
@@ -782,6 +782,12 @@ try {
   System.out.println("always printed");
 }
 ```
+### util工具类
+```
+Collections
+Arrays
+Random
+```
 
 另见
 ---