A
SpinnerModel
for sequences of numbers.
The upper and lower bounds of the sequence are defined
by properties called
minimum
and
maximum
. The size of the increase or decrease
computed by the
nextValue
and
previousValue
methods is defined by a property called
stepSize
. The
minimum
and
maximum
properties can be
null
to indicate that the sequence has no lower or upper limit.
All of the properties in this class are defined in terms of two
generic types:
Number
and
Comparable
, so that all Java numeric types
may be accommodated. Internally, there's only support for
values whose type is one of the primitive
Number
types:
Double
,
Float
,
Long
,
Integer
,
Short
, or
Byte
.
To create a SpinnerNumberModel
for the integer
range zero to one hundred, with
fifty as the initial value, one could write:
Integer value = new Integer(50);
Integer min = new Integer(0);
Integer max = new Integer(100);
Integer step = new Integer(1);
SpinnerNumberModel model = new SpinnerNumberModel(value, min, max, step);
int fifty = model.getNumber().intValue();
Spinners for integers and doubles are common, so special constructors
for these cases are provided. For example to create the model in
the previous example, one could also write:
SpinnerNumberModel model = new SpinnerNumberModel(50, 0, 100, 1);
This model inherits a ChangeListener
.
The ChangeListeners
are notified
whenever the model's value
, stepSize
,
minimum
, or maximum
properties changes.