一个班级类Clazz，里面有两个属性:班级号、班级名称。 一个学生类Student，里面有如下属性:学号、姓名、所在班级、选修课程。 使用setter方法为属性注入值，测试学生类的各个属性注入情况。 使用xml和注解两种方式完成

首先，我们创建一个简单的班级类`Clazz`和学生类`Student`：

// 班级类 (Clazz)
public class Clazz {
    private String className;
    private int classNumber;

    // 构造函数和setter/getter
    public Clazz(String className, int classNumber) {
        this.className = className;
        this.classNumber = classNumber;
    }

    // Getter and Setter methods
    public String getClassName() { return className; }
    public void setClassName(String className) { this.className = className; }

    public int getClassNumber() { return classNumber; }
    public void setClassNumber(int classNumber) { this.classNumber = classNumber; }
}

// 学生类 (Student)
import javax.xml.bind.annotation.XmlRootElement;
import java.util.ArrayList;
import java.util.List;

@XmlRootElement(name = "student")
public class Student {
    private String studentId;
    private String name;
    private Clazz clazz;
    private List<String> selectedCourses; // 假设课程名作为字符串

    public Student(String studentId, String name, Clazz clazz) {
        this.studentId = studentId;
        this.name = name;
        this.clazz = clazz;
        this.selectedCourses = new ArrayList<>();
    }

    // Getter and Setter methods
    public String getStudentId() { return studentId; }
    public void setStudentId(String studentId) { this.studentId = studentId; }

    public String getName() { return name; }
    public void setName(String name) { this.name = name; }

    public Clazz getClazz() { return clazz; }
    public void setClazz(Clazz clazz) { this.clazz = clazz; }

    // 添加选修课程的方法
    public void addSelectedCourse(String courseName) {
        this.selectedCourses.add(courseName);
    }

    // ...其他getter和setter省略
}

接下来，我们可以分别通过XML注解的方式设置属性值以及使用setter方法来测试：

**XML注解方式测试：**

// XML配置文件 (假设为student.xml)
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import java.io.File;

JAXBContext context = JAXBContext.newInstance(Student.class);
Unmarshaller unmarshaller = context.createUnmarshaller();
File xmlFile = new File("path_to_your_xml_file.xml");
Student student = (Student) unmarshaller.unmarshal(xmlFile);

System.out.println("Student ID: " + student.getStudentId());
System.out.println("Name: " + student.getName());
System.out.println("Class Number: " + student.getClazz().getClassNumber());
System.out.println("Selected Courses: " + student.getSelectedCourses());

**setter方法方式测试：**

// 创建并设置属性值
Clazz myClazz = new Clazz("高一", 101);
Student myStudent = new Student("123456", "张三", myClazz);
myStudent.setStudentId("123456789");
myStudent.setName("李四");
myStudent.addSelectedCourse("数学");

System.out.println("Student ID: " + myStudent.getStudentId());
System.out.println("Name: " + myStudent.getName());
System.out.println("Class Number: " + myStudent.getClazz().getClassNumber());
System.out.println("Selected Course: " + myStudent.getSelectedCourses().get(0));