ADD file via upload

src/UserManager.java

@@ -0,0 +1,74 @@
+import java.util.HashMap;
+import java.util.Map;
+
+public class UserManager {
+    private Map<String, User> users = new HashMap<>();          // 存储所有用户信息
+    private User currentUser;                 // 当前登录用户
+    private String currentType;             // 当前题目类型
+
+    public boolean login(String username, String password) {
+        // 检查用户是否存在且密码正确
+        if (users.containsKey(username)) {
+            User user = users.get(username);
+            if (user.validateCredentials(username, password)) {
+                currentUser = user;
+                currentType = user.getUserType();
+                System.out.println("登录成功");
+                return true;
+            }
+            else{
+                System.out.println("密码错误，请重试");
+            }
+        }
+        else{
+            System.out.println("该账号不存在,请重试");
+        }
+        return false;
+    }
+
+    public void logout() {
+        //用户退出
+        currentUser = null;
+        currentType = null;
+    }
+
+    public boolean switchUserType(String newType) {
+        //切换用户的出题类型
+        if (currentUser != null) {
+            currentType = newType;
+            return true;
+        }
+        return false;
+    }
+
+    public boolean isLoggedIn() {
+        // 检查用户是否已登录
+        return currentUser != null;
+    }
+
+    public User getCurrentUser() {
+        //获取当前用户信息
+        return currentUser;
+    }
+
+    private void initializeUsers() {
+        // 初始化预设账户
+
+        users.put("张三1", new User("张三1", "123", "小学"));
+        users.put("张三2", new User("张三2", "123", "小学"));
+        users.put("张三3", new User("张三3", "123", "小学"));
+        users.put("李四1", new User("李四1", "123", "初中"));
+        users.put("李四2", new User("李四2", "123", "初中"));
+        users.put("李四3", new User("李四3", "123", "初中"));
+        users.put("王五1", new User("王五1", "123", "高中"));
+        users.put("王五2", new User("王五2", "123", "高中"));
+        users.put("王五3", new User("王五3", "123", "高中"));
+    }
+
+    public UserManager(){
+        //构造函数初始化
+        initializeUsers();
+    }
+}
+
+