11.2(Person. Student. Employee、Faculty和Staff类)设计一个名为Person的类

和它的两个名
为Student和Employee子类。Employee类又有子类:教员类Faculty和职员类Staff，每个人都有姓名、地址、电话号码和电子邮件地址。学生有班级状态(大一，大二、大三或大四)。将这些状态定义为常量。一个雇员有办公室、工资和受聘日期。定义一个名为MyDate的类，包含数据域: year (年)、month(月)和day(日)。教员有办公时间和级别。职员有职务称号。覆盖每个类中的toString方法，显示相应的类名和人名。
画出这些类的UML图。实现这些类。编写一个测试程序，创建Person.Student, Employee, Faculty和Staff，并且调用它们的to8tring()方法。

package six;
import java.util.Scanner;
class MyDate{
private int year;
private int month;
private int day;
public MyDate(int year,int month,int day) {
this.year=year;
this.month=month;
this.day=day;
}
public int getYear() {
return year;
}
public int getMonth() {
return month;
}
public int getDay() {
return day;
}
}
class Person{
protected String name;
protected String address;
protected String phoneNumber;
protected String email;
public Person(String name,String address,String phoneNumber,String email) {
this.name=name;
this.address=address;
this.phoneNumber=phoneNumber;
this.email=email;
}
public String getName() {
return name;
}
public String getAddress() {
return address;
}
public String getPhoneNumber() {
return phoneNumber;
}
public String getEmail() {
return email;
}
public String toString() {
return "Person{" +
"name='" + name + '\'' +
'}';
}
}
class Student extends Person {
private String status;
public static final String FRESHMAN = "大一";
public static final String SOPHOMORE = "大二";
public static final String JUNIOR = "大三";
public static final String SENIOR = "大四";public Student(String name, String address, String phoneNumber, String email, String status) {
super(name, address, phoneNumber, email);
this.status = status;
}public String getStatus() {
return status;
}
public String toString() {
return "Student{" +
"name='" + super.getName() + '\'' +
", status='" + status + '\'' +
'}';
}
}
class Employee extends Person {
private String office;
private double salary;
private MyDate hireDate;public Employee(String name, String address, String phoneNumber, String email, String office, double salary, MyDate hireDate) {
super(name, address, phoneNumber, email);
this.office = office;
this.salary = salary;
this.hireDate = hireDate;
}public String getOffice() {
return office;
}public double getSalary() {
return salary;
}public MyDate getHireDate() {
return hireDate;
}
public String toString() {
return "Employee{" +
"name='" + super.getName() + '\'' +
", office='" + office + '\'' +
", salary=" + salary +
", hireDate=" + hireDate +
'}';
}
}
class Faculty extends Employee {
private String officeHours;
private String rank;public Faculty(String name, String address, String phoneNumber, String email, String office, double salary, MyDate hireDate, String officeHours, String rank) {
super(name, address, phoneNumber, email, office, salary, hireDate);
this.officeHours = officeHours;
this.rank = rank;
}public String getOfficeHours() {
return officeHours;
}public String getRank() {
return rank;
}
public String toString() {
return "Faculty{" +
"name='" + super.getName() + '\'' +
", officeHours='" + officeHours + '\'' +
", rank='" + rank + '\'' +
'}';
}
}class Staff extends Employee {
private String title;public Staff(String name, String address, String phoneNumber, String email, String office, double salary, MyDate hireDate, String title) {
super(name, address, phoneNumber, email, office, salary, hireDate);
this.title = title;
}public String getTitle() {
return title;
}
public String toString() {
return "Staff{" +
"name='" + super.getName() + '\'' +
", title='" + title + '\'' +
'}';
}
}
public class ren {public static void main(String[] args) {
Person person = new Person("张三", "地址 1", "123456789", "zhangsan@example.com");
Student student = new Student("李四", "地址 2", "987654321", "lisi@example.com", Student.SOPHOMORE);
Employee employee = new Employee("王五", "地址 3", "567891234", "wangwu@example.com", "办公室 1", 5000, new MyDate(2020, 5, 1));
Faculty faculty = new Faculty("赵六", "地址 4", "432198765", "zhaoliu@example.com", "办公室 2", 6000, new MyDate(2018, 3, 15), "9:00-17:00", "教授");
Staff staff = new Staff("钱七", "地址 5", "765432198", "qianqi@example.com", "办公室 3", 4500, new MyDate(2019, 7, 1), "经理");
System.out.println(person);
System.out.println(student);
System.out.println(employee);
System.out.println(faculty);
System.out.println(staff);
}
}

 2.3（梁耀忠英文第11版P536：*13.6）（比较圈类）创建名为ComparableCircle的类，

该类扩展Circle并实现Comparable。绘制UML图，实现基于面积的比较圆的compareTo方法。编写一个测试类来查找ComparableCircle对象的两个实例中较大的一个。（不要求画出UML图）

package six;
import java.util.*;
class Circle{
private double radius;
public Circle() {
this.radius=1.0;
}
public Circle(double radius) {
this.radius=radius;
}
public double getArea() {
return Math.PI*radius*radius;
}
}
class ComparableCircle extends Circle{
public ComparableCircle(double radius) {
super(radius);
}
public int compareTo(ComparableCircle other) {
if(this.getArea()>other.getArea()) {
return 1;
} else if(this.getArea()<other.getArea()) {
return -1;
} else{
return 0;
}
}
}
public class bijiao {
public static void main(String[] args) {
Scanner scanner=new Scanner(System.in);
double radius1,radius2;
radius1=scanner.nextDouble();
radius2=scanner.nextDouble();
ComparableCircle circle1 = new ComparableCircle(radius1);
ComparableCircle circle2 = new ComparableCircle(radius2);
int r=circle1.compareTo(circle2);
if(r>0) {
System.out.println("circle1面积更大");
}
else if(r==0) {
System.out.println("两个圆面积一样大");
}
else {
System.out.println("circle2面积更大");
}
}
}

2.4（梁耀忠英文第11版P536：*13.9）（授权圈可比）
重写清单14.2中的Circle类以扩展GeometricObject并实现Comparable接口。重写Object类中的equals方法。如果两个Circle对象的半径相同，则它们相等。绘制包含圆、几何对象和可比较对象的UML图。（不要求画出UML图）

package six;
import java.util.Scanner;
public class bijiao2 {
public static void main(String[] args) {
interface Comparable{
int equal(Circle circle);
}
abstract class GeometricObject{
private String color = "white";
private boolean filled;
private java.util.Date dateCreated;public GeometricObject() {
dateCreated = new java.util.Date();
}public GeometricObject(String color, boolean filled) {
dateCreated = new java.util.Date();
this.color = color;
this.filled = filled;
}public String getColor() {
return color;
}public void setColor(String color) {
this.color = color;
}public boolean isFilled() {
return filled;
}public void setFilled(boolean filled) {
this.filled = filled;
}public java.util.Date getDateCreated() {
return dateCreated;
}public String toString() {
return "color: " + color + " and filled: " + filled;
}
abstract double getArea();
abstract double getPerimeter();
}class Circle extends GeometricObject
implements Comparable{
public double radius;
public Circle(double radius){
this.radius=radius;
}
public double getRadius() {
return radius;
}
public int equal(Circle other) {
if(this.getRadius()>other.getRadius()) {
return 1;
} else if(this.getRadius()<other.getRadius()) {
return -1;
} else{
return 0;
}
}
public int equal(six.Circle circle) {
return 0;
}
}
Scanner scanner=new Scanner(System.in);
double radius1;
double radius2;
radius1=scanner.nextDouble();
radius2=scanner.nextDouble();
Circle circle1 = new Circle(radius1);
Circle circle2 = new Circle(radius2);
int r=circle1.equal(circle2);
if(r>0) {
System.out.println("circle1面积更大");
}
else if(r==0) {
System.out.println("两个圆面积一样大");
}
else {
System.out.println("circle2面积更大");
}
}
}

三和四就是一个有接口一个没接口的写法