Update README.md

src/Main.java

@@ -17,22 +17,24 @@ public class Main {
             System.out.println("4.创建账户");
 
             int num=scanner.nextInt();
-            scanner.nextLine();
+             scanner.nextLine();
             if(num==1){
-                Menu.MyMenu();
+                Menu.Mymenu();
             }
             else if (num==2){
-                System.exit(0);
+            System.exit(0);
             }
             else if(num==3){
                 ModifyPassword.modimenu();
             }
             else if(num==4){
-                CreateUser.createuser();
+            CreateUser.createuser();
             }
             else{
                 System.out.println("输出错误,请重新输入");
             }
         }
     }
+
+
 }

src/auth/UserManager.java

@@ -36,10 +36,10 @@ public class UserManager {
         }
     }
     public static DataLists readDataFile(String filePath) {
-        List<String> list1 = new ArrayList<>();
+        List<String> list1 = new ArrayList<>();// 创建三个列表分别存储每行的三个数据
         List<String> list2 = new ArrayList<>();
         List<String> list3 = new ArrayList<>();
-        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {
+        try (BufferedReader br = new BufferedReader(new FileReader(filePath))) {// 使用try-with-resources语句确保资源自动关闭
             String line;
             int lineNumber = 1;
             // 逐行读取
@@ -53,7 +53,8 @@ public class UserManager {
                 }
                 // 分割行数据，这里假设使用空格分隔
                 // 如果是其他分隔符(如逗号、制表符)，请修改正则表达式
-                String[] parts = line.split("\\s+");
+                String[] parts = line.split("\\s+"); // 按一个或多个空格分割
+                // 检查是否有三个数据
                 if (parts.length != 3) {
                     System.out.println("警告: 第" + lineNumber + "行数据格式不正确，需要3个数据，实际有" + parts.length + "个");
                     lineNumber++;

src/util/ExpressionUtils.java

@@ -17,8 +17,7 @@ public class ExpressionUtils {
 
     // 生成小学表达式
     public static String generatePrimaryExpr() {
-        int operands = rand.nextInt(4) + 2;
-        // 2–5 个操作数
+        int operands = rand.nextInt(4) + 2; // 2–5 个操作数
         StringBuilder expr = new StringBuilder();
         for (int i = 0; i <operands; i++) {
             if (i > 0) {

src/util/FileUtils.java

@@ -1,6 +1,7 @@
 package util;
 
 import java.io.*;
+import java.nio.file.*;
 import java.text.SimpleDateFormat;
 import java.util.*;
 
@@ -8,8 +9,7 @@ public class FileUtils {
 
     // 获取用户文件夹路径
     public static String getUserFolder(String username) {
-        String folder = "exams/" + username;
-        // 存放在项目目录下 exams/
+        String folder = "exams/" + username; // 存放在项目目录下 exams/
         File dir = new File(folder);
         if (!dir.exists()) {
             dir.mkdirs();

src/util/ModifyClass.java

@@ -6,16 +6,22 @@ import java.util.List;
 
 public class ModifyClass {
 
+    /**
+     * 查找目标名字所在行，并替换该行的第三个字符串
+     * @param filePath 文件路径
+     * @param targetName 要查找的名字（每行第一个字符串）
+     * @param newThirdString 新的第三个字符串
+     * @return 找到并替换的行号，未找到返回-1
+     */
     public static int modifyclass(String filePath, String targetName, String newThirdString) {
         List<String> lines = new ArrayList<>();
         int targetLineNumber = -1;
+
         try (BufferedReader reader = new BufferedReader(new FileReader(filePath))) {
             String line;
             while ((line = reader.readLine()) != null) {
                 lines.add(line);
-                if (line.trim().isEmpty()) {
-                    continue;
-                }
+                if (line.trim().isEmpty()) continue;
                 String[] parts = line.trim().split("\\s+");
                 if (parts.length > 0 && parts[0].equals(targetName)) {
                     targetLineNumber = lines.size();
@@ -25,6 +31,7 @@ public class ModifyClass {
             System.err.println("读取文件错误: " + e.getMessage());
             return -1;
         }
+
         if (targetLineNumber != -1) {
             int index = targetLineNumber - 1;
             String[] parts = lines.get(index).trim().split("\\s+");
@@ -32,9 +39,7 @@ public class ModifyClass {
                 parts[2] = newThirdString;
                 lines.set(index, String.join(" ", parts));
                 try (BufferedWriter writer = new BufferedWriter(new FileWriter(filePath))) {
-                    for (String l : lines){
-                        writer.write(l + System.lineSeparator());
-                    }
+                    for (String l : lines) writer.write(l + System.lineSeparator());
                 } catch (IOException e) {
                     System.err.println("写入文件错误: " + e.getMessage());
                     return -1;
@@ -45,4 +50,5 @@ public class ModifyClass {
         }
         return targetLineNumber;
     }
+
 }

src/util/menu.java

@@ -11,7 +11,7 @@ public class menu {
     User currentUser = null;
     ProblemGenerator generator = null;
 
-    public void MyMenu() {
+    public void Mymenu() {
         while (currentUser==null) {
 
             System.out.println("请输入用户名和密码（用空格隔开）：");
@@ -40,7 +40,7 @@ public class menu {
     }
 
     public static int menu1(User currentUser, ProblemGenerator generator) {
-        int count1=0 ;
+        int count1 = 0;
         while (true) {
             System.out.println("1.生成试卷");
             System.out.println("2.修改难度");