有啥问题？
package test;
public class Demo_date_tomorrow {
private int day,int month,int 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();
}
}
