import java.util.*;
/**
 * The Birthday class provides functionality for an individual birthday.
 * 
 * @author Dr. Ball and Student Name 
 * @version September 18, 2006
 */
public class Birthday
{
    //instance variables:
    private int day;
    private int month;
    private int year;

    /**
     * No-arg constructor for the Birthday class. Sets
     * the default birthday to 1-1-2001
     *      
     */
    public Birthday()
    {
        this.day = 1;
        this.month = 1;
        this.year = 2001;
    }

    /**
     * Constructor for the Birthday class that takes
     * three arguments.
     *      
     * @param  day   an int
     * @param  month   an int
     * @param  year   an int     
     */
    public Birthday(int day, int month, int year)
    {
        this.day = day;
        this.month = month;
        this.year = year;
    }    

    /**
     * setDay sets the day of the birthday.
     * 
     * @param  day    an int
     */
    public void setDay(int day)
    {
        this.day = day;
    }
    
    /**
     * setMonth sets the month of the birthday.
     * 
     * @param  month    an int
     */
    public void setMonth(int month)
    {
        this.month = month;
    }
    
    /**
     * setYear sets the year of the birthday.
     * 
     * @param  year    an int
     */
    public void setYear(int year)
    {
        this.year = year;
    }    
    
    /**
     * getDay sets the day of the birthday.
     * 
     * @return  the day of the birthday
     */
    public int getDay()
    {
        return this.day;
    }
    
    /**
     * setMonth sets the month of the birthday.
     * 
     * @reutn  the month of the birthday
     */
    public int getMonth()
    {
        return this.month;
    }
    
    /**
     * setYear sets the year of the birthday.
     * 
     * @return  the year of the birthday
     */
    public int getYear()
    {
        return this.year;
    }        
    
    /**
     * getAge gets the age of the birthday.
     * 
     * @return  the age of the birthday
     */
    public int getAge()
    {
        int age = this.getThisYear() - this.year;
        if (this.month > this.getThisMonth())
        {
            age--;
        }
        else if(this.month == this.getThisMonth())
        {
            if (this.day > this.getThisDay())
            {
                age--;
            }
        }
        return age;
    }
    
    /**
     * isSeniorCitizen tests if the age of the birthday
     * is greater or equal to 65. If it is the method
     * returns true. If it is not the method returns false.
     * 
     * @return  if the age of the birthday is greater or equal to 65
     */    
    public boolean isSeniorCitizen()
    {
        if (this.getAge() >= 65)
            return true;
        else
            return false;
    }    
    
    /**
     * getThisYear returns the current year.
     * 
     * @return     the current year
     */
    private int getThisYear()
    {
        Calendar cal = new GregorianCalendar();
        return (int) cal.get(Calendar.YEAR);
    }

    /**
     * getThisYear returns the current month.
     * 
     * @return     the current month
     */    
    private int getThisMonth()
    {
        Calendar cal = new GregorianCalendar();
        return (int) cal.get(Calendar.MONTH)+1;
    }
    
    /**
     * getThisYear returns the current day.
     * 
     * @return     the current day
     */
    private int getThisDay()
    {
        Calendar cal = new GregorianCalendar();
        return (int) cal.get(Calendar.DATE);
    }      
}