From 8d3c857be34f44197c0e92f1eed07d7d89f9312d Mon Sep 17 00:00:00 2001
From: xuxin <840198532@qq.com>
Date: Wed, 4 Feb 2026 15:03:00 +0800
Subject: [PATCH] =?UTF-8?q?=E8=BF=9B=E9=98=B6day05-=E8=87=AA=E5=AE=9A?=
 =?UTF-8?q?=E4=B9=89=E5=BC=82=E5=B8=B8?=
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---
 .../com/inmind/custom_exception06/Demo11.java | 40 +++++++++++++++++++
 .../custom_exception06/RegistException.java   | 14 +++++++
 2 files changed, 54 insertions(+)
 create mode 100644 javaSE-day05/src/com/inmind/custom_exception06/Demo11.java
 create mode 100644 javaSE-day05/src/com/inmind/custom_exception06/RegistException.java

diff --git a/javaSE-day05/src/com/inmind/custom_exception06/Demo11.java b/javaSE-day05/src/com/inmind/custom_exception06/Demo11.java
new file mode 100644
index 0000000..85ad3d7
--- /dev/null
+++ b/javaSE-day05/src/com/inmind/custom_exception06/Demo11.java
@@ -0,0 +1,40 @@
+package com.inmind.custom_exception06;
+/*
+要求：我们模拟注册操作，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。
+使用异常来实现,用户名已注册的信息提示业务逻辑
+ */
+public class Demo11 {
+    //定义一些已经存在的用户名（假数据，以后使用配置文件或者数据库）
+    static String []  usernames = {"tom","jack","rose"};
+
+    public static void main(String[] args) {
+        //定义一个变量接收用户输入的用户名
+        String user = "jack";
+
+        //调用一个方法来判断当前用户名是否存在
+        try {
+            regist(user);
+            //如果没有出现异常，就继续相应的操作即可
+            //....
+        } catch (RegistException e) {
+            e.getMessage();//获取一些自定义异常，与业务相关的信息
+            System.out.println("捕获了注册异常后的处理");
+        } catch (Exception e) {
+            e.printStackTrace();
+            System.out.println(e.getMessage());
+        }
+
+        System.out.println("程序结束");
+    }
+
+    private static void regist(String user) throws RegistException {
+        //遍历已有的用户名，逐一判断是否存在,存在就抛出一个异常
+        for (String username : usernames) {
+            if (username.equals(user)) {
+                throw new RegistException("该用户名"+user+"已经存在");
+            }
+        }
+    }
+
+
+}
diff --git a/javaSE-day05/src/com/inmind/custom_exception06/RegistException.java b/javaSE-day05/src/com/inmind/custom_exception06/RegistException.java
new file mode 100644
index 0000000..594f0d7
--- /dev/null
+++ b/javaSE-day05/src/com/inmind/custom_exception06/RegistException.java
@@ -0,0 +1,14 @@
+package com.inmind.custom_exception06;
+/*
+    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 Exception{//编译时异常
+public class RegistException extends RuntimeException{//运行时异常
+
+    public RegistException(String message) {
+        super(message);
+    }
+    //业务功能
+}