Java Reference
In-Depth Information
.
withDayOfMonth
(
1
)))
{
return
Quarter
.
SECOND
;
}
else
if
(
now
.
isBefore
(
now
.
with
(
Month
.
NOVEMBER
)
.
withDayOfMonth
(
1
)))
{
return
Quarter
.
THIRD
;
}
else
{
return
Quarter
.
FOURTH
;
}
}
}
TemporalQuery
objects can be used directly or indirectly. Let's look at an example of
each:
QuarterOfYearQuery
q
=
new
QuarterOfYearQuery
();
// Direct
Quarter
quarter
=
q
.
queryFrom
(
LocalDate
.
now
());
System
.
out
.
println
(
quarter
);
// Indirect
quarter
=
LocalDate
.
now
().
query
(
q
);
System
.
out
.
println
(
quarter
);
Under most circumstances, it is better to use the indirect approach, where the query
object is passed as a parameter to
query()
. This is because it is normally a lot clearer
to read in code.
Adjusters
Adjusters modify date and time objects. Suppose, for example, that we want to
return the first day of a quarter that contains a particular timestamp:
public
class
FirstDayOfQuarter
implements
TemporalAdjuster
{
@Override
public
Temporal
adjustInto
(
Temporal
temporal
)
{
final
int
currentQuarter
=
YearMonth
.
from
(
temporal
)
.
get
(
IsoFields
.
QUARTER_OF_YEAR
);
switch
(
currentQuarter
)
{
case
1
:
return
LocalDate
.
from
(
temporal
)
.
with
(
TemporalAdjusters
.
firstDayOfYear
());
case
2
:
return
LocalDate
.
from
(
temporal
)
.
withMonth
(
Month
.
APRIL
.
getValue
())
.
with
(
TemporalAdjusters
.
firstDayOfMonth
());
case
3
:
return
LocalDate
.
from
(
temporal
)
.
withMonth
(
Month
.
JULY
.
getValue
())
.
with
(
TemporalAdjusters
.
firstDayOfMonth
());
case
4
:
m
n
s
a
