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A spinner that rolls from the end of a list to beginning E-mail
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This Java Swing tip illustrates a spinner that rolls from the end of a list to beginning. This tip describes a custom spinner model that rolls over the end of a list back to the beginning (or vice versa).

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

public 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);
  }
}


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