import java.util.*;
public class CloneTest{
	public static void main(String[] args)
	{ try
		{//某雇員在2000年1.1被雇傭，在同年年底漲工資，調用copy函數在原有數據的基礎上
			//只需修改日期，工資這兩個數據其余不變
			Employee original=new Employee("John Q.public",5000);
			original.setHireDay(2000,1,1);
			Employee copy=original.clone();
			copy.raiseSalary(10);
			copy.setHireDay(2000,12,31);
			System.out.println("original="+original);
			System.out.println("copy="+copy);
		}
		catch(CloneNotSupportedException e)
		{
			e.printStackTrace();
		}
	}
}
class Employee implements Cloneable
{
	public Employee(String n,double s)
	{  name=n;
		 salary=s;
		}
		public Employee clone() throws CloneNotSupportedException 
		{
			//call object.clone()
			Employee cloned=(Employee)super.clone();
			//clone mutable fields
			cloned.hireDay=(Date)hireDay.clone();
			return cloned;
		}
		/**
		Set the hire day to a given date
		@param year the year of the hire day
		@param month the month of the hire day
		@param day the day of the hire day
		*/
		public void setHireDay(int year,int month,int day)
		{
			hireDay=new GregorianCalendar(year,month-1,day).getTime();
		}
		public void raiseSalary(double byPercent)
		{
			double raise=salary*byPercent/100;
			salary+=raise;
		}
		public String toString ()
		{
			return "Employee[name="+name+",salary="+salary+",hireDay="+hireDay+"]";
		}
		private String name;
		private double salary;
		private Date hireDay;
	}