diff --git a/problems/0669.修剪二叉搜索树.md b/problems/0669.修剪二叉搜索树.md
index 41f684f4..cf1239c1 100644
--- a/problems/0669.修剪二叉搜索树.md
+++ b/problems/0669.修剪二叉搜索树.md
@@ -242,7 +242,25 @@ public:
 
 
 Java：
-
+```Java
+class Solution {
+    public TreeNode trimBST(TreeNode root, int low, int high) {
+        if (root == null) {
+            return null;
+        }
+        if (root.val < low) {
+            return trimBST(root.right, low, high);
+        }
+        if (root.val > high) {
+            return trimBST(root.left, low, high);
+        }
+        // root在[low,high]范围内
+        root.left = trimBST(root.left, low, high);
+        root.right = trimBST(root.right, low, high);
+        return root;
+    }
+}
+```
 
 Python：