⚫ 定义一个Person类，含： 姓名name、性别sex、年龄age等字段（均为私有属性），相应的属性获取/设置方法， 如getName/setName。 两个构造方法，一个无参一个有参，有参构造方法要能对以上三个属性初始化。 ⚫ Teacher类，继承自Person类。，增加： 职称（jobTitile）、部门(dept)等字段，对应的属性获取/设置方法； 同样两个构造方法，至少一个要能对父类初始化。 ⚫ Student类，继承Person类增加： 学号、入学时间、专业等字段，对应属性的设置/获取方法； 同样两个构造方法，至少一个要能对父类初始化。 ⚫ 给出主类Main类，定义main方法，分别创建以上对象，并测试方法。 注意，以上类如果在同一个文件中，只能给出一个public类。不要在一个类中定义类， 即不要出现下面的形式： publicclassMain{ publicclassPerson{ … } } 2. 相关要求如下。 ⚫ 定义形状抽象类（Shape）： 求面积的抽象方法方法doublegetArea();返回对象信息toString()方法，类静态属性ID。 ⚫ 定义圆（Circle）类，含半径、圆心坐标等属性，并继承形状类，定义toString方法， 类属性ID及获取的静态方法。 ⚫ 定义圆柱体（Cylinder）类 继承自圆类，定义高属性，定义toString方法，类属性ID及获取的静态方法，定义返 回体积的方法getVolume。 ⚫ 主类main方法中定义不同类对象，并测试相关方法。用

Java语言实现一个Person类、Teacher类和Student类以及Shape类、Circle类和Cylinder类，并对其方法进行测试。

1. Person类、Teacher类和Student类的实现：

Person.java

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

    public Person() {
    }

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

    public String getName() {
        return name;
    }

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

    public String getSex() {
        return sex;
    }

    public void setSex(String sex) {
        this.sex = sex;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

Teacher.java

public class Teacher extends Person {
    private String jobTitle;
    private String dept;

    public Teacher() {
    }

    public Teacher(String name, String sex, int age, String jobTitle, String dept) {
        super(name, sex, age);
        this.jobTitle = jobTitle;
        this.dept = dept;
    }

    public String getJobTitle() {
        return jobTitle;
    }

    public void setJobTitle(String jobTitle) {
        this.jobTitle = jobTitle;
    }

    public String getDept() {
        return dept;
    }

    public void setDept(String dept) {
        this.dept = dept;
    }
}

Student.java

public class Student extends Person {
    private String studentId;
    private String admissionTime;
    private String major;

    public Student() {
    }

    public Student(String name, String sex, int age, String studentId, String admissionTime, String major) {
        super(name, sex, age);
        this.studentId = studentId;
        this.admissionTime = admissionTime;
        this.major = major;
    }

    public String getStudentId() {
        return studentId;
    }

    public void setStudentId(String studentId) {
        this.studentId = studentId;
    }

    public String getAdmissionTime() {
        return admissionTime;
    }

    public void setAdmissionTime(String admissionTime) {
        this.admissionTime = admissionTime;
    }

    public String getMajor() {
        return major;
    }

    public void setMajor(String major) {
        this.major = major;
    }
}

2. Shape类、Circle类和Cylinder类的实现：

Shape.java

public abstract class Shape {
    private static int ID = 0;

    public abstract double getArea();

    public String toString() {
        return "Shape";
    }

    public static int getID() {
        return ID;
    }
}

Circle.java

public class Circle extends Shape {
    private double radius;
    private double x;
    private double y;

    public Circle(double radius, double x, double y) {
        this.radius = radius;
        this.x = x;
        this.y = y;
    }

    public double getRadius() {
        return radius;
    }

    public void setRadius(double radius) {
        this.radius = radius;
    }

    public double getX() {
        return x;
    }

    public void setX(double x) {
        this.x = x;
    }

    public double getY() {
        return y;
    }

    public void setY(double y) {
        this.y = y;
    }

    public double getArea() {
        return Math.PI * radius * radius;
    }

    public String toString() {
        return "Circle";
    }

    public static int getID() {
        return Shape.getID() + 1;
    }
}

Cylinder.java

public class Cylinder extends Circle {
    private double height;

    public Cylinder(double radius, double x, double y, double height) {
        super(radius, x, y);
        this.height = height;
    }

    public double getHeight() {
        return height;
    }

    public void setHeight(double height) {
        this.height = height;
    }

    public double getVolume() {
        return Math.PI * getRadius() * getRadius() * height;
    }

    public String toString() {
        return "Cylinder";
    }

    public static int getID() {
        return Circle.getID() + 1;
    }
}

3. Main类的实现：

Main.java

public class Main {
    public static void main(String[] args) {
        // 测试Person、Teacher和Student类
        Person person = new Person();
        person.setName("Tom");
        person.setSex("male");
        person.setAge(20);
        System.out.println(person.getName() + " " + person.getSex() + " " + person.getAge());

        Teacher teacher = new Teacher("Kate", "female", 30, "Professor", "Math");
        System.out.println(teacher.getName() + " " + teacher.getSex() + " " + teacher.getAge() + " " + teacher.getJobTitle() + " " + teacher.getDept());

        Student student = new Student("Jack", "male", 18, "20210001", "2021-09-01", "Computer Science");
        System.out.println(student.getName() + " " + student.getSex() + " " + student.getAge() + " " + student.getStudentId() + " " + student.getAdmissionTime() + " " + student.getMajor());

        // 测试Shape、Circle和Cylinder类
        Circle circle = new Circle(2.0, 1.0, 1.0);
        System.out.println(circle.toString() + " ID: " + circle.getID() + " radius: " + circle.getRadius() + " x: " + circle.getX() + " y: " + circle.getY() + " area: " + circle.getArea());

        Cylinder cylinder = new Cylinder(2.0, 1.0, 1.0, 3.0);
        System.out.println(cylinder.toString() + " ID: " + cylinder.getID() + " radius: " + cylinder.getRadius() + " x: " + cylinder.getX() + " y: " + cylinder.getY() + " height: " + cylinder.getHeight() + " volume: " + cylinder.getVolume());
    }
}