Switch through buttons of a buttonGroup (manually)

Question

Hello everybody,
i created a little editor to resize, relocate, rotate etc... a simple Jpanel.
The edit options e.g. resize are realized as buttons within a buttongroup, so that only one option can be activated at a time.
This works fine by using a actionListener with the mouse for now, but i would like to set these options with a different input device too.
final JToggleButton bt_Resize = new JToggleButton();
bt_Resize.setName(Properties.idOptionResize);
buttonList.put(Properties.idOptionResize, bt_Resize);
final JToggleButton bt_Rotate = new JToggleButton();
bt_Rotate.setName(Properties.idOptionRotate);
buttonList.put(Properties.idOptionRotate, bt_Rotate);
final JToggleButton bt_Relocate = new JToggleButton();
bt_Relocate.setName(Properties.idOptionRelocate);
buttonList.put(Properties.idOptionRelocate, bt_Relocate);
ActionListener actionListener = new ActionListener() {
     public void actionPerformed(ActionEvent actionEvent) {
             if (actionEvent.getActionCommand().equals(Properties.idOptionResize)){
          editOption = Properties.idOptionResize;
             } else if (actionEvent.getActionCommand().equals(Properties.idOptionRotate)){
          editOption = Properties.idOptionRotate;
             } else if (actionEvent.getActionCommand().equals(Properties.idOptionRelocate)){
             editOption = Properties.idOptionRelocate;
};//end actionListener
initButtons(buttonList, actionListener);
(...)i already get commands like "up" and "down" from this device and would now like to switch through the buttons accordingly:
public void processCommand(String command) {
if(command.equals(Properties.idDown)){
     // set next button as selected
} else if(command.equals(Properties.idUp)){
     // set previous button as selected
...               Is there a simple way to switch through the buttons in a buttonGroup so that with every command (up/down) the next or previous button is selected?

Answer 1

@ Calypso: i got a panel with vertically arranged buttons like this:
[button1]
[button2]
[button3]
[button4]and by switching up/down i meant select the next or previous button in that "list". e.g. button2 is selected i want to switch to button3 (down) or button1 (up) without using the mouse.
@ Encephalopathic: thanks for your effort, but i found a much easier way to get the result i needed:
//first i create a list of all buttons:
ArrayList<JtoggleButton> buttonList;
// the buttons are added to the list right after adding them to the panel
//this is the method that selects the next/previous button like clicking on it directly
private void moveButtonEntry(int index){
     JToggleButton[] btnArray;
     boolean noButtonSelected = true;
     boolean indexInBounds = true;
     if (!buttonList.isEmpty()){
          btnArray = buttonList.toArray(new JToggleButton[0]);     
          int i = 0;
          while (indexInBounds){
               if (i > btnArray.length - 1) {
                    indexInBounds = false;
               } else {
                    if (btnArray.isSelected()){
                         if ((i+index < btnArray.length) && (i+index > -1)){
                              btnArray[i+index].doClick();//setSelected(true);
                              indexInBounds = false;
                              noButtonSelected = false;
                         } else {
                              indexInBounds = false;
                              noButtonSelected = false;
                    i++;
          }//end while
          /* if none of the buttons is selected yet, select the first one! */
          if(noButtonSelected){
               btnArray[0].doClick();//setSelected(true);
}//end moveButtonEntry