定义一个教师类（Teacher）：该类提供教师的工号和姓名信息；再定义一个课程类（Course）:该类描述了课程的编号和课程名称，每门课程都要指定一个教师。 要求：创建一个课程对象，通过该对象获得任课教师对象的信息并输出。

首先，我们定义一个`Teacher`类，用于存储教师的工号和姓名：

public class Teacher {
    private int teacherId;
    private String name;

    public Teacher(int id, String name) {
        this.teacherId = id;
        this.name = name;
    }

    // getter 和 setter 方法
    public int getTeacherId() {
        return teacherId;
    }

    public void setTeacherId(int teacherId) {
        this.teacherId = teacherId;
    }

    public String getName() {
        return name;
    }

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

接下来，定义`Course`类，它包含了课程编号、课程名称以及引用`Teacher`对象的属性：

public class Course {
    private int courseId;
    private String courseName;
    private Teacher teacher;

    public Course(int id, String name, Teacher teacher) {
        this.courseId = id;
        this.courseName = name;
        this.teacher = teacher;
    }

    // getter 和 setter 方法
    public int getCourseId() {
        return courseId;
    }

    public void setCourseId(int courseId) {
        this.courseId = courseId;
    }

    public String getCourseName() {
        return courseName;
    }

    public void setCourseName(String courseName) {
        this.courseName = courseName;
    }

    public Teacher getTeacher() {
        return teacher;
    }

    public void setTeacher(Teacher teacher) {
        this.teacher = teacher;
    }

    @Override
    public String toString() {
        return "Course{" +
                "courseId=" + courseId +
                ", courseName='" + courseName + '\'' +
                ", teacher=" + teacher.getName() +
                '}';
    }
}

现在我们可以创建一个具体的`Teacher`对象和`Course`对象，并通过`Course`对象获取教师信息：

public static void main(String[] args) {
    Teacher teacher = new Teacher(001, "张三");
    Course course = new Course(001, "数学", teacher);

    System.out.println("课程信息: " + course);
    // 这将打印出: 课程信息: Course{courseId=001, courseName='数学', teacher=张三}
}