diff --git a/src/leecode/6.z-字形变换.java b/src/leecode/6.z-字形变换.java
index 2ee5fdd..d613607 100644
--- a/src/leecode/6.z-字形变换.java
+++ b/src/leecode/6.z-字形变换.java
@@ -5,7 +5,7 @@ package leecode;/*
  */
 
 // @lc code=start
-class Solution {
+class No6 {
     public String convert(String s, int numRows) {
         if (numRows == 0 || numRows == 1) return s;
         int structNum = numRows + numRows - 2;
diff --git a/src/leecode/7.整数反转.java b/src/leecode/7.整数反转.java
new file mode 100644
index 0000000..18f8e34
--- /dev/null
+++ b/src/leecode/7.整数反转.java
@@ -0,0 +1,24 @@
+package leecode;
+
+/*
+ * @lc app=leetcode.cn id=7 lang=java
+ *
+ * [7] 整数反转
+ */
+
+// @lc code=start
+class No7 {
+    public int reverse(int x) {
+        int res = 0, y = Math.abs(x);
+        while (y != 0) {
+            if (res < Integer.MIN_VALUE / 10 || res > Integer.MAX_VALUE / 10) {
+                return 0;
+            }
+            res = res * 10 + y % 10;
+            y /= 10;
+        }
+        return x >= 0 ? res : - res;
+    }
+}
+// @lc code=end
+