From 5bb0c182e988ceeec833d0199450dcf04400f490 Mon Sep 17 00:00:00 2001
From: lzy <3479370893@qq.com>
Date: Sat, 27 Sep 2025 12:19:19 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BC=98=E5=8C=96JavaS=E8=BF=9B=E4=B8=80?=
 =?UTF-8?q?=E6=AD=A5=E5=AE=8C=E5=96=84=E7=BB=86=E8=8A=82?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 src/META-INF/MANIFEST.MF            | 3 +++
 src/com/mathpaper/user/Account.java | 5 +++++
 2 files changed, 8 insertions(+)
 create mode 100644 src/META-INF/MANIFEST.MF

diff --git a/src/META-INF/MANIFEST.MF b/src/META-INF/MANIFEST.MF
new file mode 100644
index 0000000..8254642
--- /dev/null
+++ b/src/META-INF/MANIFEST.MF
@@ -0,0 +1,3 @@
+Manifest-Version: 1.0
+Main-Class: com.mathpaper.main.Main
+
diff --git a/src/com/mathpaper/user/Account.java b/src/com/mathpaper/user/Account.java
index 6c5cd7a..b765a13 100644
--- a/src/com/mathpaper/user/Account.java
+++ b/src/com/mathpaper/user/Account.java
@@ -1,5 +1,7 @@
 package com.mathpaper.user;
 
+import java.util.Set;
+
 public class Account {
     private String username;
     private String password;
@@ -7,6 +9,9 @@ public class Account {
 
     // 构造方法
     public Account(String username, String password, String type) {
+        if (!Set.of("小学", "初中", "高中").contains(type)) {
+            throw new IllegalArgumentException("无效的学段类型");
+        }
         this.username = username;
         this.password = password;
         this.type = type;