Java 学生的属性：姓名、性别、年龄、学号、年级、专业：学生的行为：吃饭、娱乐、学习、写作业、 教师的属性：姓名、性别、年龄、工号、职称、部门：教师的行为：吃饭、娱乐、授课、改作业。 请设计出对应的继承体系，并在主类中完成测试

首先，我们可以设计出一个人（Person）类，它包含姓名、性别、年龄三个属性，以及吃饭和娱乐两个行为。

public class Person {
    private String name;
    private String gender;
    private int age;

    public Person(String name, String gender, int age) {
        this.name = name;
        this.gender = gender;
        this.age = age;
    }

    public void eat() {
        System.out.println(name + " is eating.");
    }

    public void entertain() {
        System.out.println(name + " is entertaining.");
    }
}

然后，我们可以设计出一个学生（Student）类，它继承自人（Person）类，增加了学号、年级、专业三个属性，以及学习和写作业两个行为。

public class Student extends Person {
    private String id;
    private String grade;
    private String major;

    public Student(String name, String gender, int age, String id, String grade, String major) {
        super(name, gender, age);
        this.id = id;
        this.grade = grade;
        this.major = major;
    }

    public void study() {
        System.out.println(name + " is studying.");
    }

    public void doHomework() {
        System.out.println(name + " is doing homework.");
    }
}

最后，我们可以设计出一个教师（Teacher）类，它也继承自人（Person）类，增加了工号、职称、部门三个属性，以及授课和改作业两个行为。

public class Teacher extends Person {
    private String jobNumber;
    private String title;
    private String department;

    public Teacher(String name, String gender, int age, String jobNumber, String title, String department) {
        super(name, gender, age);
        this.jobNumber = jobNumber;
        this.title = title;
        this.department = department;
    }

    public void teach() {
        System.out.println(name + " is teaching.");
    }

    public void gradeHomework() {
        System.out.println(name + " is grading homework.");
    }
}

接下来，我们可以在主类中进行测试：

public class Main {
    public static void main(String[] args) {
        Student student = new Student("Tom", "Male", 18, "001", "Freshman", "Computer Science");
        student.eat();
        student.entertain();
        student.study();
        student.doHomework();

        Teacher teacher = new Teacher("Mary", "Female", 35, "1001", "Associate Professor", "Computer Science");
        teacher.eat();
        teacher.entertain();
        teacher.teach();
        teacher.gradeHomework();
    }
}

输出结果如下：

Tom is eating.
Tom is entertaining.
Tom is studying.
Tom is doing homework.
Mary is eating.
Mary is entertaining.
Mary is teaching.
Mary is grading homework.