public class Date{

    private int day;
    private int month;
    private final static String[] monthName = {"","January","February","March",
					     "April","May","June","July",
					     "August","September","October",
					     "November","December"};
    private final static int[] monthLength = {0,31,28,31,30,31,30,31,31,30,
					      31,30,31};

    public Date(int m, int d){
	day = d;
	month = m;
    }

    private boolean isValid(){
	if (month < 1 || month > 12) 
	    return false;
	if (day < 1 || day > monthLength[month])
	    return false;
	return true;
    }

    public String toString(){
	if (isValid())
	    return monthName[month]+" "+day;
	else 
	    return "Invalid Date";
    }

    public Date tomorrow(){
	if (isValid()){
	    Date tom = new Date(month,day+1);
	    if (tom.isValid())
		return tom;
	    else{
		int m;
		if (month==12)
		    m = 1;
		else 
		    m = month + 1;
		return new Date(m,1);
	    }
	}
	else
	    return new Date(0,0); // an invalid date
    }

}