diff --git a/RandomString.java b/RandomString.java
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index 0000000..a283f0c
--- /dev/null
+++ b/RandomString.java
@@ -0,0 +1,45 @@
+import java.util.Scanner;
+import java.util.Random;
+/**
+ * GarbledCodeGenerator - 一个可控制长度的乱码生成器
+ * 
+ * Copyright (C) 2026 edwardp20 <zhangxixi201268@outlook.com>
+ * 
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+public class RandomString {
+    public static void main(String[] args) {
+        String[] arr = {
+                "1", "2", "3", "4", "5", "6", "7", "8", "9",
+                "a", "b", "c", "d", "e", "f", "g", "h", "i", "j",
+                "k", "l", "m", "n", "o", "p", "q", "r", "s", "t",
+                "u", "v", "w", "x", "y", "z"
+        };
+        Scanner s = new Scanner(System.in);
+        String result = "";
+        IO.println("请输入你要的长度");
+        int longer = s.nextInt();
+        for(int i = 1;i <= longer;i++){
+            int randomIndex = getRandomNumber(arr.length);
+            result = result + arr[randomIndex];
+        }
+        IO.println(result);
+    }
+    
+    public static int getRandomNumber(int random) {
+        Random r = new Random();
+        int randomNumber = r.nextInt(random);
+        return randomNumber;
+    }
+}
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