Java Reference
In-Depth Information
2. Obtain the total seconds
totalSeconds
by dividing
totalMilliseconds
by
1000
(e.g.,
1203183068328
milliseconds /
1000 1203183068
seconds).
=
3. Compute the current second from
totalSeconds % 60
(e.g.,
1203183068
seconds
%
60 8
, which is the current second).
=
4. Obtain the total minutes
totalMinutes
by dividing
totalSeconds
by
60
(e.g.,
1203183068
seconds /
60 20053051
minutes).
=
5. Compute the current minute from
totalMinutes % 60
(e.g.,
20053051
minutes %
60 31
, which is the current minute).
=
6. Obtain the total hours
totalHours
by dividing
totalMinutes
by
60
(e.g.,
20053051
minutes /
60 334217
hours).
=
7. Compute the current hour from
totalHours % 24
(e.g.,
334217
hours %
24
=
17
,
which is the current hour).
Listing 2.6 gives the complete program.
L
ISTING
2.6
ShowCurrentTime.java
1
public class
ShowCurrentTime {
2
public static void
main(String[] args) {
3
// Obtain the total milliseconds since midnight, Jan 1, 1970
4
long
totalMilliseconds = System.currentTimeMillis();
totalMilliseconds
5
6
// Obtain the total seconds since midnight, Jan 1, 1970
7
long
totalSeconds = totalMilliseconds /
1000
;
totalSeconds
8
9
// Compute the current second in the minute in the hour
10
long
currentSecond = totalSeconds %
60
;
currentSecond
11
12
// Obtain the total minutes
13
long
totalMinutes = totalSeconds /
60
;
totalMinutes
14
15
// Compute the current minute in the hour
16
long
currentMinute = totalMinutes %
60
;
currentMinute
17
18
// Obtain the total hours
19
long
totalHours = totalMinutes /
60
;
totalHours
20
21
// Compute the current hour
22
long
currentHour = totalHours %
24
;
currentHour
23
24
// Display results
25 System.out.println(
"Current time is "
+ currentHour +
":"
26 + currentMinute +
":"
+ currentSecond +
" GMT"
);
27 }
28 }
preparing output
Current time is 17:31:8 GMT
Line 4 invokes
System.currentTimeMillis()
to obtain the current time in milliseconds
as a long value. Thus, all the variables are declared as the long type in this program. The seconds,
minutes, and hours are extracted from the current time using the
/
and
%
operators (lines 6-22).
