清华大学：JAVA教学课件：5-1

程序5-1
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 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;
}
}