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diff --git a/W2/StudentTest.class b/W2/StudentTest.class
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diff --git a/W2/StudentTest.java b/W2/StudentTest.java
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+// 1. 定义 Student 类
+class Student {
+    // 定义题目要求的三个属性
+    int studentId;      // 学号
+    String name;        // 姓名
+    double score;       // 成绩
+
+    // 定义 study 方法
+    public void study() {
+        // 这里打印学生的学习信息，用到上面的属性
+        System.out.println("学生 " + name + " (学号:" + studentId + ") 正在认真学习，当前成绩是：" + score);
+    }
+}
+
+// 2. 主类（包含 main 方法）
+public class StudentTest {
+    public static void main(String[] args) {
+        // 实例化第一个学生对象
+        Student stu1 = new Student();
+        // 给第一个学生的属性赋值
+        stu1.studentId = 20240101;
+        stu1.name = "张三";
+        stu1.score = 92.5;
+
+        // 实例化第二个学生对象
+        Student stu2 = new Student();
+        // 给第二个学生的属性赋值
+        stu2.studentId = 20240102;
+        stu2.name = "李四";
+        stu2.score = 88.0;
+
+        // 调用方法
+        stu1.study();
+        stu2.study();
+    }
+}
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