From 9a0c3251cffbc150e283faccb8da9d431a2586fe Mon Sep 17 00:00:00 2001
From: guide <koushuangbwcx@163.com>
Date: Wed, 29 Dec 2021 21:06:14 +0800
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---
 .../algorithms/几道常见的字符串算法题.md       | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/docs/cs-basics/algorithms/几道常见的字符串算法题.md b/docs/cs-basics/algorithms/几道常见的字符串算法题.md
index 37176650..ccd420c4 100644
--- a/docs/cs-basics/algorithms/几道常见的字符串算法题.md
+++ b/docs/cs-basics/algorithms/几道常见的字符串算法题.md
@@ -61,13 +61,19 @@ public class Solution {
    * 第二种方法：利用API替换掉所用空格，一行代码解决问题
    */
   public static String replaceSpace2(StringBuffer str) {
-
+    
     return str.toString().replaceAll("\\s", "%20");
   }
 }
 
 ```
 
+对于替换固定字符（比如空格）的情况，第二种方法其实可以使用 `replace` 方法替换，性能更好!
+
+```java
+str.toString().replace(" ","%20");
+```
+
 ## 3. 最长公共前缀
 
 > Leetcode:  编写一个函数来查找字符串数组中的最长公共前缀。如果不存在公共前缀，返回空字符串 ""。