Spinner Model Controls - The Definitive Guide to Java Swing - page 508

If the minimum or maximum value is null , the range is open-ended. For the no-argument
version, the initial value is 0 and step is 1. The step size is literal, so if you set the step to .333,
there will be no rounding off.
Table 14-5 shows the properties for SpinnerNumberModel . The added properties are the
same as those provided by the constructor.

Table 14-5. SpinnerNumberModel Properties

Property Name Data Type Access

maximum Comparable

Read-write

minimum Comparable Read-write

nextValue Object Read-only

number Number Read-only

previousValue Object Read-only

stepSize Number

Read-write

value Object Read-write

Custom Models
Typically, the available models for the JSpinner are sufficient, so you don't need to subclass.
However, that isn't always the case. For example, you might want to use a custom model that
wraps the SpinnerListModel —instead of stopping at the first or last element, it wraps around to
the other end. One such implementation is shown in Listing 14-2.

Listing 14-2. RolloverSpinnerListModel Class

import javax.swing.*;
import java.util.*;

public class RolloverSpinnerListModel extends SpinnerListModel {

public RolloverSpinnerListModel(List<?> values) {
super(values);
}

public RolloverSpinnerListModel(Object[] values) {
super(values);
}