Spinners
You might be wondering just what a spinner is. It’s a new 1.4 component similar to the JComboBox, but it shows only one item. It includes up and down arrows to “scroll” through its set of values. A JFormattedTextField is used to edit and render those values. Spinners are quite flexible. They work nicely with a set of choices (such as the months of the year) as well as with unbounded ranges such as a set of integers.
import javax.swing.*;
import javax.swing.event.*;
import java.awt.*;
import java.util.List;
class RolloverSpinnerListModel extends SpinnerListModel {
public RolloverSpinnerListModel(Object[] items) {
super(items);
}
public RolloverSpinnerListModel(List items) {
super(items);
}
public Object getNextValue() {
Object nv = super.getNextValue();
if (nv != null) {
return nv;
}
return getList().get(0);
}
public Object getPreviousValue() {
Object pv = super.getPreviousValue();
if (pv != null) {
return pv;
}
List l = getList();
return l.get(l.size() - 1);
}
}
public class SpinnerTest extends JFrame {
public SpinnerTest() {
super("JSpinner Test");
setSize(300, 180);
setDefaultCloseOperation(EXIT_ON_CLOSE);
Container c = getContentPane();
c.setLayout(new GridLayout(0, 2));
c.add(new JLabel(" Basic Spinner"));
c.add(new JSpinner());
c.add(new JLabel(" Date Spinner"));
c.add(new JSpinner(new SpinnerDateModel()));
String weekdays[] = new String[] { "Sunday", "Monday", "Tuesday",
"Wednesday", "Thursday", "Friday", "Saturday" };
c.add(new JLabel(" List Spinner"));
c.add(new JSpinner(new SpinnerListModel(weekdays)));
c.add(new JLabel(" Number Spinner"));
c.add(new JSpinner(new SpinnerNumberModel(0, 0, 100, 5)));
c.add(new JLabel(" Rollover List Spinner"));
c.add(new JSpinner(new RolloverSpinnerListModel(weekdays)));
setVisible(true);
}
public static void main(String args[]) {
new SpinnerTest();
}
}
