holidaysked.java

21天学通JAVA2（第三版）（专业参考版）

import java.util.*;

public class HolidaySked {
    BitSet sked;

    public HolidaySked() {
        sked = new BitSet(365);
        int[] holiday = { 1, 20, 43, 48, 53, 115, 131, 146, 165, 166,
             185, 244, 286, 315, 327, 359 };
        for (int i = 0; i < holiday.length; i++) {
            addHoliday(holiday[i]);
        }
    }

    public void addHoliday(int dayToAdd) {
        sked.set(dayToAdd);        
    }

    public boolean isHoliday(int dayToCheck) {
        boolean result = sked.get(dayToCheck);
        return result;
    }

    public static void main(String[] arguments) {
        HolidaySked cal = new HolidaySked();
        if (arguments.length > 0) {
            try {
                int whichDay = Integer.parseInt(arguments[0]);
                if (cal.isHoliday(whichDay)) {
                    System.out.println("Day number " + whichDay + " is a holiday.");
                } else {
                    System.out.println("Day number " + whichDay + " is not a holiday.");
                }
            } catch (NumberFormatException nfe) {
                System.out.println("Error: " + nfe.getMessage());
            }
        }
    }
}