diff --git "a/lcof/\351\235\242\350\257\225\351\242\23005. \346\233\277\346\215\242\347\251\272\346\240\274/README.md" "b/lcof/\351\235\242\350\257\225\351\242\23005. \346\233\277\346\215\242\347\251\272\346\240\274/README.md"
index c441b76a51c9421c6b68bb4891b059eb99d3e87a..2487134961ec3c23186b9a86264c54e1917b9def 100644
--- "a/lcof/\351\235\242\350\257\225\351\242\23005. \346\233\277\346\215\242\347\251\272\346\240\274/README.md"	
+++ "b/lcof/\351\235\242\350\257\225\351\242\23005. \346\233\277\346\215\242\347\251\272\346\240\274/README.md"	
@@ -59,6 +59,39 @@ class Solution {
 }
 ```
 
+使用 char[]:
+
+```java
+public String replaceSpace(String s) {
+    if (s == null){
+        return null;
+    }
+ 
+    char[] array = s.toCharArray();
+    int count = 0;
+    for (char c : array){
+        if (c == ' '){
+            count++;
+        }
+    }
+ 
+    char[] newArray = new char[array.length - count + count * 3];
+    int pointer = newArray.length - 1;
+    for (int j = array.length - 1; j >= 0; j--){
+        if (array[j] != ' '){
+            newArray[pointer--] = array[j];
+            continue;
+        }
+        newArray[pointer--] = '0';
+        newArray[pointer--] = '2';
+        newArray[pointer--] = '%';
+    }
+ 
+    return new String(newArray);
+}
+```
+
+
 ### **JavaScript**
 
 使用字符串内置方法：