date.java

Java程序设计清华出版课件源码答案共十四章

public class Date {
	private int day, month, year;
	Date ( int i, int j, int k) {
	day = i;
	month = j;
	year = k;
}

Date() {
	day = 1;
	month = 1;
	year = 1998;
}

Date ( Date d) {
	day = d.day;
	month = d.month;
	year = d.year;
}

public void printDate() {
	System.out.print(day +"/" +month +"/" +year);
}

public Date tomorrow() {
	Date d = new Date(this);
	d.day++;
	if (d.day > d.daysInMonth()) {
		d.day = 1;
		d.month ++;
		if (d.month > 12) {
			d.month = 1;
			d.year ++;
		}
	}
	return d;
}

public int daysInMonth() {
	switch (month) {
	case 1: case 3: case 5: case 7: 
	case 8: case 10: case 12:
		return 31;
	case 4: case 6: case 9: case 11:
		return 30;
	default:
	if ( year % 100 != 0 && year % 4 == 0 ) {
		return 29;
	}
	else return 28;
	}
}

public static void main (String args[]) {
	Date d1 = new Date();
	System.out.print("The current date is (dd / mm / yy):");
	d1.printDate();
	System.out.println();
	System.out.print("Its tomorrow is (dd / mm / yy): ");
	d1.tomorrow().printDate();
	System.out.println();

	Date d2 = new Date(28, 2, 1964);
	System.out.print("The current date is (dd / mm / yy):");
	d2.printDate();
	System.out.println();
	System.out.print("Its tomorrow is (dd / mm / yy): ");
	d2.tomorrow().printDate();
	System.out.println();
}
}