diff --git a/problems/0530.二叉搜索树的最小绝对差.md b/problems/0530.二叉搜索树的最小绝对差.md
index d5abc692..e30e76f5 100644
--- a/problems/0530.二叉搜索树的最小绝对差.md
+++ b/problems/0530.二叉搜索树的最小绝对差.md
@@ -151,7 +151,29 @@ public:
 
 
 Java：
-
+```Java
+class Solution {
+    TreeNode pre;// 记录上一个遍历的结点
+    int result = Integer.MAX_VALUE;
+    public int getMinimumDifference(TreeNode root) {
+        if (root == null) {
+            return result;
+        }
+        // 左
+        int left = getMinimumDifference(root.left);
+        
+        // 中
+        if (pre != null) {
+            result = Math.min(left, root.val - pre.val);
+        }
+        pre = root;
+        // 右
+        int right = getMinimumDifference(root.right);
+        result = Math.min(right, result);
+        return result;
+    }
+}
+```
 
 Python：