import java.text.*;
import java.util.*;
public class PersonTest{
	public static void main(String[] args)
	{
		Person[] people=new Person[2];
		people[0]=new Employee("Harry Hacker",50000,1989,10,10);
		people[1]=new Student("Maria Morris","computer science");
		for(Person p : people)
		System.out.println(p.getName()+","+p.getDescription());
	}
}
abstract class Person{
	public Person(String n)
	{ name=n;
	}
	public abstract String getDescription();
	public String getName()
	{ return name;
	}
	private String name;
}
class Employee extends Person{//Employee繼承Person類，包含五個參數
		
	public Employee(String n,double s,int year,int month,int day)
	{ super(n);
		salary=s;
		GregorianCalendar Calendar=new GregorianCalendar(year,month-1,day);
		hireDay=Calendar.getTime();
	}
	public double getSalary()
	{return salary;
	}
	public String getDescription()
	{return String.format("an employee with a salary of $%.2f",salary);
	}
	public void raiseSalary(double byPercent)
	{double raise=salary*byPercent/100;
		salary+=raise;
	}
	private double salary;
  private Date hireDay;
}
class Student extends Person{//Student繼承Person類，包含兩個參數--名字，專業
  public Student(String n,String m)
	{super(n);
		major=m;
	}
	public String getDescription()
	{return "a student majoring in "+major;
	}
	private String major;
}