diff --git a/problems/0344.反转字符串.md b/problems/0344.反转字符串.md
index f5b0e22b..2807d04a 100644
--- a/problems/0344.反转字符串.md
+++ b/problems/0344.反转字符串.md
@@ -151,6 +151,23 @@ class Solution {
         }
     }
 }
+
+// 第二种方法用temp来交换数值更多人容易理解些
+class Solution {
+    public void reverseString(char[] s) {
+        int l = 0;
+        int r = s.length - 1;
+        while(l < r){
+            char temp = s[l];
+            s[l] = s[r];
+            s[r] = temp;
+            l++;
+            r--;
+        }
+    }
+}
+
+
 ```
 
 Python：
@@ -335,3 +352,4 @@ object Solution {
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">
   <img src="../pics/网站星球宣传海报.jpg" width="1000"/>
 </a>
+
diff --git a/problems/0541.反转字符串II.md b/problems/0541.反转字符串II.md
index 238e6349..59891365 100644
--- a/problems/0541.反转字符串II.md
+++ b/problems/0541.反转字符串II.md
@@ -194,6 +194,29 @@ class Solution {
         return new String(ch);
     }
 }
+
+
+// 解法二还可以用temp来交换数值，会的人更多些
+class Solution {
+    public String reverseStr(String s, int k) {
+        char[] ch = s.toCharArray();
+        for(int i = 0;i < ch.length;i += 2 * k){
+            int start = i;
+            // 判断尾数够不够k个来取决end指针的位置
+            int end = Math.min(ch.length - 1,start + k - 1);
+            while(start < end){
+                
+                char temp = ch[start];
+                ch[start] = ch[end];
+                ch[end] = temp;
+
+                start++;
+                end--;
+            }
+        }
+        return new String(ch);
+    }
+}
 ```
 ```java
 // 解法3
@@ -469,3 +492,4 @@ impl Solution {
 <a href="https://programmercarl.com/other/kstar.html" target="_blank">
   <img src="../pics/网站星球宣传海报.jpg" width="1000"/>
 </a>
+