Java Reference
In-Depth Information
Display 5.20
The Class
Date
(Partial Definition)
(part 1 of 2)
This is not a complete definition of the class
Date
.
The complete definition of the class
Date
is in Display
4.11, but this has the details that are important to
what we are discussing in this chapter.
1
public
class
Date
2{
3
private
String month;
4
private
int
day;
5
private
int
year;
//a four digit number.
6
public
Date(String monthString,
int
day,
int
year)
7
{
8
setDate
(monthString, day, year);
9
}
10
public
Date(Date aDate)
11
{
12
if
(aDate ==
null
)
//Not a real date.
13
{
Copy constructor
14
System.out.println("Fatal Error.");
15
System.exit(0);
16
}
17
month = aDate.month;
18
day = aDate.day;
19
year = aDate.year;
20
}
21
public
void
setDate(String monthString,
int
day,
int
year)
22
{
23
if
(dateOK(
m
onthString, day, year))
The method
dateOK
checks that the
date is a legitimate date, such as
not having more than 31 days.
24
{
25
this
.month = monthString;
26
this
.day = day;
27
this
.year = year;
28
}
29
else
30
{
31
System.out.println("Fatal Error");
32
System.exit(0);
33
}
34
}
35
public
void
setYear(
int
year)
36
{
37
if
( (year < 1000) || (year > 9999) )
38
{
