public class StudentTest {public static void main(String[] args) {
    Student stu1 = new Student();
    stu1.studentId = "001";
    stu1.name = "Wang";
    stu1.score = 85.5;

    Student stu2 = stu1;

    stu1.study();
    stu2.study();

    System.out.println("stu1 的名字: " + stu1.name);
    System.out.println("stu2 的名字: " + stu2.name);

    stu2.name = "Li";

    System.out.println("修改后 stu1 的名字: " + stu1.name);
    System.out.println("修改后 stu2 的名字: " + stu2.name);
}
}
class Student {String studentId;
    String name;
    double score;

    public void study() {
        System.out.println(name + " 正在学习");
    }

}