diff --git a/s-day05/src/com/inmind/exception01/Demo11.java b/s-day05/src/com/inmind/exception01/Demo11.java
new file mode 100644
index 0000000..b7e14b9
--- /dev/null
+++ b/s-day05/src/com/inmind/exception01/Demo11.java
@@ -0,0 +1,32 @@
+package com.inmind.exception01;
+
+import java.util.Scanner;
+
+//要求：我们模拟登陆操作，如果用户名已存在，则抛出异常并提示：亲，该用户名已经被注册
+public class Demo11 {
+    static String[] usernames = {"jack","tom","rose"};
+
+    public static void main(String[] args) {
+        try {
+            Scanner sc = new Scanner(System.in);
+            System.out.println("请输入用户名:");
+            String username = sc.nextLine();
+            regist(username);
+            System.out.println(username+"注册成功");
+        } catch (RegistException e) {
+            String msg = e.getMessage();
+            System.out.println(msg);
+        }
+        System.out.println("程序结束");
+    }
+
+    private static void regist(String username) {
+        //如果传入用户名，已经在数组中存在了，说明已经注册过了，那我们主动抛出一个业务异常RegistException，并携带业务信息
+        for (String u : usernames) {
+            if (u.equals(username)) {
+                throw new RegistException("该用户名"+username+"已存在，请重新输入");
+            }
+        }
+        //如果没有抛出异常，说明注册业务是正确。
+    }
+}
diff --git a/s-day05/src/com/inmind/exception01/RegistException.java b/s-day05/src/com/inmind/exception01/RegistException.java
new file mode 100644
index 0000000..e5f1318
--- /dev/null
+++ b/s-day05/src/com/inmind/exception01/RegistException.java
@@ -0,0 +1,14 @@
+package com.inmind.exception01;
+/*
+    自定义异常:
+        1.编译时异常:提醒代码有语法问题或者声明了某些异常(继承Exception)
+        2.运行时异常:用来处理业务逻辑(继承RuntimeException)
+ */
+public class RegistException extends RuntimeException{
+    public RegistException() {
+    }
+
+    public RegistException(String message) {
+        super(message);
+    }
+}