diff --git a/src/MathExamGenerator.class b/src/MathExamGenerator.class
index 909c0b1..dd4a12c 100644
Binary files a/src/MathExamGenerator.class and b/src/MathExamGenerator.class differ
diff --git a/src/MathExamGenerator.java b/src/MathExamGenerator.java
index 172f4d6..4beeee2 100644
--- a/src/MathExamGenerator.java
+++ b/src/MathExamGenerator.java
@@ -27,7 +27,7 @@ import java.util.Set;
  */
 public class MathExamGenerator {
   // 预设的用户账号信息
-  private static final Map<String, UserInfo> USER_ACCOUNTS = new HashMap<>();
+  private static final Map<String, UserInfo> userAccounts = new HashMap<>();
 
   // 当前登录用户信息
   private static UserInfo currentUser = null;
@@ -39,19 +39,19 @@ public class MathExamGenerator {
   static {
     // 初始化小学、初中和高中各三个账号
     // 小学账户
-    USER_ACCOUNTS.put("张三1", new UserInfo("张三1", "123", "小学"));
-    USER_ACCOUNTS.put("张三2", new UserInfo("张三2", "123", "小学"));
-    USER_ACCOUNTS.put("张三3", new UserInfo("张三3", "123", "小学"));
+    userAccounts.put("张三1", new UserInfo("张三1", "123", "小学"));
+    userAccounts.put("张三2", new UserInfo("张三2", "123", "小学"));
+    userAccounts.put("张三3", new UserInfo("张三3", "123", "小学"));
 
     // 初中账户
-    USER_ACCOUNTS.put("李四1", new UserInfo("李四1", "123", "初中"));
-    USER_ACCOUNTS.put("李四2", new UserInfo("李四2", "123", "初中"));
-    USER_ACCOUNTS.put("李四3", new UserInfo("李四3", "123", "初中"));
+    userAccounts.put("李四1", new UserInfo("李四1", "123", "初中"));
+    userAccounts.put("李四2", new UserInfo("李四2", "123", "初中"));
+    userAccounts.put("李四3", new UserInfo("李四3", "123", "初中"));
 
     // 高中账户
-    USER_ACCOUNTS.put("王五1", new UserInfo("王五1", "123", "高中"));
-    USER_ACCOUNTS.put("王五2", new UserInfo("王五2", "123", "高中"));
-    USER_ACCOUNTS.put("王五3", new UserInfo("王五3", "123", "高中"));
+    userAccounts.put("王五1", new UserInfo("王五1", "123", "高中"));
+    userAccounts.put("王五2", new UserInfo("王五2", "123", "高中"));
+    userAccounts.put("王五3", new UserInfo("王五3", "123", "高中"));
   }
 
   public static void main(String[] args) {
@@ -93,7 +93,7 @@ public class MathExamGenerator {
       String password = parts[1];
       // 验证用户登录
       boolean loginSuccess = false;
-      for (Map.Entry<String, UserInfo> entry : USER_ACCOUNTS.entrySet()) {
+      for (Map.Entry<String, UserInfo> entry : userAccounts.entrySet()) {
         if (entry.getValue().getUsername().equals(username) &&
             entry.getValue().getPassword().equals(password)) {
           currentUser = entry.getValue();
@@ -165,7 +165,6 @@ public class MathExamGenerator {
   // 生成不重复的题目
   private static List<String> generateUniqueQuestions(int questionCount) {
     List<String> questions = new ArrayList<>();
-    Random random = new Random();
     int attempts = 0;
     int maxAttempts = questionCount * 3; // 最多尝试次数，避免死循环