ADD file via upload

src/main/java/com/example/myapp/model/Exam.java

@@ -0,0 +1,40 @@
+package com.example.myapp.model;
+
+import java.util.List;
+import java.time.LocalDateTime;
+
+public class Exam {
+  private String gradeLevel;
+  private int questionCount;
+  private List<Question> questions;
+  private int score;
+  private LocalDateTime startTime;
+  private LocalDateTime endTime;
+
+  public Exam(String gradeLevel, int questionCount, List<Question> questions) {
+    this.gradeLevel = gradeLevel;
+    this.questionCount = questionCount;
+    this.questions = questions;
+    this.startTime = LocalDateTime.now();
+    this.score = -1; // -1表示未评分
+  }
+
+  // Getters and Setters
+  public String getGradeLevel() { return gradeLevel; }
+  public void setGradeLevel(String gradeLevel) { this.gradeLevel = gradeLevel; }
+
+  public int getQuestionCount() { return questionCount; }
+  public void setQuestionCount(int questionCount) { this.questionCount = questionCount; }
+
+  public List<Question> getQuestions() { return questions; }
+  public void setQuestions(List<Question> questions) { this.questions = questions; }
+
+  public int getScore() { return score; }
+  public void setScore(int score) { this.score = score; }
+
+  public LocalDateTime getStartTime() { return startTime; }
+  public void setStartTime(LocalDateTime startTime) { this.startTime = startTime; }
+
+  public LocalDateTime getEndTime() { return endTime; }
+  public void setEndTime(LocalDateTime endTime) { this.endTime = endTime; }
+}