?? persontest.java
字號:
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;
}
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