ADD file via upload

src/User.java

@@ -0,0 +1,87 @@
+// User.java
+import java.util.ArrayList;
+import java.util.Scanner;
+import java.io.IOException;
+
+/**
+ * 用户管理类，处理用户登录和账户信息。
+ */
+public class User {
+  private String username;
+  private String password;
+  private String level;
+  private final ArrayList<User> userList = new ArrayList<>();
+  private int loginState = 1;
+
+  public boolean login() {
+    if (loginState == 1) {
+      try {
+        new ProcessBuilder("clear").inheritIO().start().waitFor();
+      } catch (IOException | InterruptedException exception) {
+        // 清屏失败，继续执行
+      }
+      System.out.println("=== 中小学数学卷子自动生成程序 ===");
+      System.out.println("请输入账户名称，密码:");
+    }
+
+    Scanner scanner = new Scanner(System.in);
+    String inputUsername = scanner.next();
+    String inputPassword = scanner.next();
+
+    for (User user : userList) {
+      if (inputUsername.equals(user.getUsername()) && inputPassword.equals(user.getPassword())) {
+        this.username = inputUsername;
+        this.password = inputPassword;
+        this.level = user.getLevel();
+        loginState = 1;
+        return true;
+      }
+    }
+
+    System.out.println("请输入正确的用户名、密码");
+    loginState = 0;
+    return true;
+  }
+
+  public void start() {
+    initializeUsers();
+    while (login()) {
+      if (loginState == 0) {
+        continue;
+      } else if (loginState == 1) {
+        ProblemManager problemManager = new ProblemManager();
+        problemManager.start(this);
+      }
+    }
+  }
+
+  public User(String username, String password, String level) {
+    this.username = username;
+    this.password = password;
+    this.level = level;
+  }
+
+  private void initializeUsers() {
+    userList.add(new User("张三1", "123", "小学"));
+    userList.add(new User("张三2", "123", "小学"));
+    userList.add(new User("张三3", "123", "小学"));
+    userList.add(new User("李四1", "123", "初中"));
+    userList.add(new User("李四2", "123", "初中"));
+    userList.add(new User("李四3", "123", "初中"));
+    userList.add(new User("王五1", "123", "高中"));
+    userList.add(new User("王五2", "123", "高中"));
+    userList.add(new User("王五3", "123", "高中"));
+  }
+
+  public String getUsername() {
+    return username;
+  }
+
+  public String getPassword() {
+    return password;
+  }
+
+  public String getLevel() {
+    return level;
+  }
+}