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What is causing my java awt and swing browser's back button to not function properly?

The actionForward and actionBack functions are both throwing IndexOutofBounds exceptions and I cannot figure out why? I was tasked with making a very simple web browser with function back and forward buttons as well as a url address bar. When the ArrayList pageList has a size of 2 the buttons work as intended. However, once the pageList has a size of 3 or more they break.
class Proj03RunnerHtmlHandler extends JFrame implements HyperlinkListener{
JEditorPane html;
JButton backButton, forwardButton;
JTextField urlTextField;
ArrayList<String> pageList = new ArrayList<String>();
public Proj03RunnerHtmlHandler(String website) {
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setTitle("Asg03");
pageList.add(website);
try{
if(website != null){
html = new JEditorPane(website);
html.setEditable(false);
html.addHyperlinkListener(this);
JPanel buttonPanel = new JPanel();
backButton = new JButton("Back");
backButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
actionBack();
}
});
buttonPanel.add(backButton);
urlTextField = new JTextField("http://www.somesite.com");
urlTextField.addKeyListener(new KeyAdapter() {
public void keyReleased(KeyEvent e){
if (e.getKeyCode() == KeyEvent.VK_ENTER) {
try {
showPage(new URL(urlTextField.getText()), true);
} catch(Exception ey){
ey.printStackTrace();
}
}
}
});
buttonPanel.add(urlTextField);
forwardButton = new JButton("Forward");
forwardButton.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
actionForward();
}
});
buttonPanel.add(forwardButton);
JScrollPane scroller = new JScrollPane();
JViewport vp = scroller.getViewport();
vp.add(html);
this.getContentPane().add(buttonPanel, BorderLayout.NORTH);
this.getContentPane().add(scroller, BorderLayout.CENTER);
this.setSize(669,669);
this.setVisible(true);
}
} catch(Exception e){
e.printStackTrace();
}
}
public void hyperlinkUpdate(HyperlinkEvent e){
if (e.getEventType() == HyperlinkEvent.EventType.ACTIVATED){
if (!(e instanceof HTMLFrameHyperlinkEvent)) {
try {
showPage(e.getURL(), true);
} catch(Exception ex){
ex.printStackTrace();
}
}
}
}
public void actionBack() {
try {
String currentUrl = html.getPage().toString();
int currentIndex = pageList.indexOf(currentUrl);
showPage(new URL(pageList.get(currentIndex - 1)), false);
} catch (Exception e){
e.printStackTrace();
}
}
public void actionForward() {
try {
String currentUrl = html.getPage().toString();
int currentIndex = pageList.indexOf(currentUrl);
showPage(new URL(pageList.get(currentIndex + 1)), false);
} catch (Exception e){
e.printStackTrace();
}
}
public void showPage(URL pageUrl, boolean addToList){
try {
URL currentUrl = html.getPage();
html.setPage(pageUrl);
if (addToList) {
int listSize = pageList.size();
if (listSize > 0) {
int pageIndex =
pageList.indexOf(currentUrl.toString());
if (pageIndex < listSize - 1) {
for (int i = listSize - 1; i > pageIndex; i--) {
pageList.remove(i);
}
}
}
pageList.add(pageUrl.toString());
}
urlTextField.setText(pageUrl.toString());
} catch (Exception e) {
e.printStackTrace();
}
}
}

if (pageIndex < listSize - 1) {
for (int i = listSize - 1; i > pageIndex; i--) {
pageList.remove(i);
}
}
There's two obvious problems with this.
You should be removing only one page from the history.
If the page is at the end (pageIndex == listSize - 1), then you don't remove the page but do add a duplicate.

Lejos EV3 Native Library bluecove_arm not available WR

I am woring on simple example to use Wii Remote control on a Ev3 using Lejos 0.9.1-beta. I am using WiiRemoteJ and Bluecove 2.1.1-SNAPSHOT and the example works on my Mac, but I have the next error on my EV3:
Native Library bluecove_arm not available WR
I found a solution on the next link, but I don't know how to compile and create a new jar inside of the EV3.
Can you help me please?
This is my code
package test;
import wiiremotej.*;
import wiiremotej.event.*;
import com.intel.bluetooth.BlueCoveConfigProperties;
import lejos.hardware.lcd.LCD;
public class Wii extends WiiRemoteAdapter {
private WiiRemote remote;
private static boolean accelerometerSource = true;
private static int y = 0;
private static int lastY = 0;
public static void main(String args[]) {
System.setProperty(BlueCoveConfigProperties.PROPERTY_JSR_82_PSM_MINIMUM_OFF, "true");
WiiRemoteJ.setConsoleLoggingOff();
try {
LCD.drawString("Buscando WR", 0, 2);
WiiRemote remote = null;
while (remote == null) {
try {
remote = WiiRemoteJ.findRemote();
LCD.drawString("WR encontrado", 0, 2);
}
catch (Exception e) {
remote = null;
LCD.drawString("ERROR", 0, 2);
}
}
remote.addWiiRemoteListener(new Wii(remote));
remote.setAccelerometerEnabled(true);
remote.setSpeakerEnabled(false);
remote.setIRSensorEnabled(false, WRIREvent.BASIC);
remote.setLEDIlluminated(0, false);
remote.getButtonMaps().add(new ButtonMap(WRButtonEvent.HOME, ButtonMap.NUNCHUK, WRNunchukExtensionEvent.C,
new int[] { java.awt.event.KeyEvent.VK_CONTROL }, java.awt.event.InputEvent.BUTTON1_MASK, 0, -1));
final WiiRemote remoteF = remote;
Runtime.getRuntime().addShutdownHook(new Thread(new Runnable() {
public void run() {
remoteF.disconnect();
}
}));
} catch (Exception e) {
e.printStackTrace();
}
}
public Wii(WiiRemote remote) {
this.remote = remote;
}
public void accelerationInputReceived(WRAccelerationEvent evt) {
//Doblar derecha y izquierda
if(accelerometerSource){
lastY = y;
//300 es el centro
y = (int)(evt.getYAcceleration()/5*300)+300;
if( y < lastY - 2){
LCD.drawString("Izquierda", 3, 2);
}
else if( y > lastY + 2){
LCD.drawString("Derecha", 3, 2);
}
}
}
public void buttonInputReceived(WRButtonEvent evt) {
if (evt.isPressed(WRButtonEvent.ONE)){
LCD.drawString("Avanzar", 5, 2);
}
if (evt.isPressed(WRButtonEvent.TWO)){
LCD.drawString("Retroceder", 5, 2);
}
}
public void disconnected() {
System.out.println("Remote disconnected... Please Wii again.");
System.exit(0);
}
public void statusReported(WRStatusEvent evt) {
}
public void IRInputReceived(WRIREvent evt) {
}
public void extensionConnected(WiiRemoteExtension extension) {
System.out.println("Extension connected!");
try {
remote.setExtensionEnabled(true);
} catch (Exception e) {
e.printStackTrace();
}
}
public void extensionPartiallyInserted() {
System.out.println("Extension partially inserted. Push it in more next time!");
}
public void extensionUnknown() {
System.out.println("Extension unknown. Did you try to plug in a toaster or something?");
}
public void extensionDisconnected(WiiRemoteExtension extension) {
System.out.println("Extension disconnected. Why'd you unplug it, eh?");
}
}

Get text of each JTextArea

I've code like this:
public main() {
setVisible(true);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(700, 500);
//tabbed pane
add(tb);
}
public JTextArea txtArea() {
JTextArea area = new JTextArea();
String st = String.valueOf(tab);
area.setName(st);
return area;
}
public static void main (String[] args) {
SwingUtilities.invokeLater(new Runnable() {
#Override
public void run() {
new main();
}
});
}
#Override
public void actionPerformed(ActionEvent e) {
Object source = e.getSource();
if(source==mnew) {
tab++;
tb.add("Untitled-"+tab,new JPanel().add(txtArea()));
int s = tb.getSelectedIndex();
s = tb.getTabCount()-1;
tb.setSelectedIndex(s);
}
if(source==save) {
int s = tb.getSelectedIndex()+1;
}
Every click on the "New" menu item, code creates new tab with new panel and textarea (it's similar to a lot of text editors like notepad++).
After clicked "Save" in menu bar I want to get text from focused jtextarea.
Please help.

Add a document listener to the text area.
public JTextArea txtArea() {
JTextArea area = new JTextArea();
tstDocumentListener dcL = new tstDocumentListener();
area.getDocument().addDocumentListener(dcL);
String st = String.valueOf(tab);
area.setName(st);
return area;
}
tstDocumentListener
public class tstDocumentListener implements DocumentListener
{
public void changedUpdate(DocumentEvent e) {}
public void removeUpdate(DocumentEvent e)
{
String newString = "";
int lengthMe = e.getDocument().getLength();
try
{
newString = e.getDocument().getText(0,lengthMe);
System.out.println(newString);
}
catch(Exception exp)
{
System.out.println("Error");
}
}
public void insertUpdate(DocumentEvent e)
{
String newString = "";
int lengthMe = e.getDocument().getLength();
try
{
newString = e.getDocument().getText(0,lengthMe);
System.out.println(newString);
}
catch(Exception exp)
{
System.out.println("Error");
}
}
}
Edit
As for getting the text when you gain or lose focus on the text area
public JTextArea txtArea() {
JTextArea area = new JTextArea();
CustomFocusListener cFL = new CustomFocusListener();
area.addFocusListener(cFL);
String st = String.valueOf(tab);
area.setName(st);
return area;
}
CustomFocusListener
public class CustomFocusListener implements FocusListener
{
#Override
public void focusGained(FocusEvent e)
{
String parseMe = "";
JTextArea src;
try
{
src = (JTextArea)e.getSource();
parseMe = src.getText();
System.out.println(parseMe);
}
catch (ClassCastException ignored)
{
}
}
#Override
public void focusLost(FocusEvent e)
{
String parseMe = "";
JTextArea src;
try
{
src = (JTextArea)e.getSource();
parseMe = src.getText();
System.out.println(parseMe);
}
catch (ClassCastException ignored)
{
}
}
}

How to set Borders graphics G JAVA

I just now trying to make a game where there are few borders on the map, which is being generated from a text document. The text document has 1s and 0s where ther is 1 it shows a wall. So how do I make it so the character stops infront of the wall
My Code:
MAIN CLASS:
public class JavaGame {
public static void main(String[] args) {
final Platno p = new Platno();
final JFrame okno = new JFrame("Test");
Mapa map = new Mapa();
okno.setResizable(false);
okno.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
okno.setSize(800, 600);
okno.setVisible(true);
map.nacti();
okno.add(p);
p.mapa = map;
okno.addKeyListener(new KeyListener() {
#Override
public void keyTyped(KeyEvent e) {
}
#Override
public void keyPressed(KeyEvent e) {
int kod = e.getKeyCode();
if(kod == KeyEvent.VK_LEFT)
{
Platno.x -= 3;
p.repaint();
}
else if(kod == KeyEvent.VK_RIGHT)
{
Platno.x +=3;
p.repaint();
}
else if(kod == KeyEvent.VK_UP)
{
Platno.y -=3;
p.repaint();
}
else if(kod == KeyEvent.VK_DOWN)
{
Platno.y +=3;
p.repaint();
}
}
#Override
public void keyReleased(KeyEvent e) {
}
});
/* Timer = new Timer(1, new ActionListener() {
#Override
public void actionPerformed(ActionEvent e)
{
Platno.y -=3;
p.repaint();
}
}); */
}`
Map loader class:
public void nacti()
{
try (BufferedReader br = new BufferedReader(new FileReader("map1-1.txt")))
{
String radek;
int cisloRadku = 0;
while((radek = br.readLine()) != null)
{
for(int i = 0; i < radek.length(); i++)
{
char znak = radek.charAt(i);
int hodnota = Integer.parseInt(String.valueOf(znak));
pole[i][cisloRadku] = hodnota;
}
cisloRadku++;
}
}
catch (Exception ex)
{
JOptionPane.showMessageDialog(null, "Error: "+ex.getMessage());
}
}
public void vykresli(Graphics g)
{
try {
wall = ImageIO.read(ClassLoader.getSystemResource("Images/wall.gif"));
} catch (IOException ex) {
JOptionPane.showMessageDialog(null, "Error: "+ex.getMessage());
}
for(int i = 0; i < pole[0].length; i++)
{
for(int j = 0; j < pole.length; j++)
{
if(pole[j][i] == 1)
{
g.setColor(Color.RED);
// g.fillRect(j*40, i*40, 40, 40);
g.drawImage(wall, j*40, i*40, null);
}
}
}
}`
and the Hero class:
public class Hero {
public int poziceX;
public int poziceY;
public static boolean upB = false;
public static boolean downB = false;
public static boolean rightB = false;
public static boolean leftB = false;
BufferedImage up;
BufferedImage down;
BufferedImage right;
BufferedImage left;
public Hero()
{
try {
up = ImageIO.read(ClassLoader.getSystemResource("Images/Hero_Up.png"));
down = ImageIO.read(ClassLoader.getSystemResource("Images/Hero_Down.png"));
right = ImageIO.read(ClassLoader.getSystemResource("Images/Hero_Right.png"));
left = ImageIO.read(ClassLoader.getSystemResource("Images/Hero_Left.png"));
} catch (IOException ex) {
JOptionPane.showMessageDialog(null, "Error: "+ex.getMessage());
}
}
public void vykreslit(Graphics g)
{
if(upB == true)
{
g.drawImage(up, poziceX, poziceX, null);
}
else if(downB == true)
{
g.drawImage(down, poziceX, poziceX, null);
}
else if(leftB == true)
{
g.drawImage(left, poziceX, poziceX, null);
}
else if(rightB == true)
{
g.drawImage(right, poziceX, poziceX, null);
}
}`
Thanks for your help :)

You could calculate the 'future position' for a move, and test for collisions.
If a collision occur, dont'move, otherwise you're ok to move.
See if this logic can help you:
public boolean willCollide(int row, int col, Board map)
{
return map[row][col] == 1;
}
public void moveLeft(Hero hero, Board map)
{
//watch for index out of bounds!
int futureCol = hero.y - 1;
if (! willCollide(hero.row, futureCol)
hero.y = futureCol;
}

How can I make a suggestion List in my Autocomplete application?

I am making an autocomplete application and the list of my words are coming from my database. I have a textfield and now I want to make a suggestion list that will appear below the field everytime I type something. Could you give me some hint or idea how to do it? Thanks in advance.

Much better if you use JCombobox but if you are using Jtextfield, I would rather suggest to you to use Jlist and put in JWindow since you are using textfield, thats what I've tried in my Dictionary application.
EDIT :
public class MainMenu extends JPanel
{
private final Connection connection;
private final Application application;
private JTextField word = new JTextField(10);
private final JButton translate = new JButton();
private final JComboBox translators = new JComboBox();
private final JButton search = new JButton();
private JList speechPartAndDefinitionWidget;
private final DefaultListModel speechPartAndDefinitionWidgetModel = new DefaultListModel();
private Translator translator;
private Suggestor suggestor;
private DefaultListModel translatedWidgetModel;
private JList translatedWidget;
private final DefaultListModel suggestionWidgetModel = new DefaultListModel();
private final JList suggestionWidget = new JList(suggestionWidgetModel);
private JavaWindow javaWindow = new JavaWindow(suggestionWidget);
public MainMenu(Application application, Connection connection)
{
word.getDocument().addDocumentListener(new DocumentListener()
{
public void insertUpdate(DocumentEvent e)
{
try
{
onWordUpdated(word.getText());
}
catch (ClassNotFoundException e1)
{
e1.printStackTrace();
}
catch (SQLException e1)
{
e1.printStackTrace();
}
}
public void removeUpdate(DocumentEvent e)
{
try
{
onWordUpdated(word.getText());
}
catch (ClassNotFoundException e1)
{
e1.printStackTrace();
}
catch (SQLException e1)
{
e1.printStackTrace();
}
}
public void changedUpdate(DocumentEvent e)
{
try
{
onWordUpdated(word.getText());
}
catch (ClassNotFoundException e1)
{
e1.printStackTrace();
}
catch (SQLException e1)
{
e1.printStackTrace();
}
}
});
this.application = application;
this.connection = connection;
translators.setFocusable(false);
word.grabFocus();
word.requestFocus();
word.setFocusable(true);
search.setText("<html><b><u>S</u>earch</b></html>");
translate.setText("<html><b><u>T</u>ranslate</b></html>");
translators.addItem(new EnglishBisayaTranslator(connection));
setToolTipText("English-Bisaya");
translators.addItem(new BisayaEnglishTranslator(connection));
setToolTipText("Bisaya-English");
setLayout(new BorderLayout());
JPanel formX = new JPanel();
formX.setLayout(new BorderLayout());
JPanel header = new JPanel();
header.setLayout(new GridBagLayout());
header.add(translators);
header.add(word);
header.add(search);
header.add(translate);
translators.setBorder(BorderFactory.createEtchedBorder(1));
translators.setBorder(BorderFactory.createEmptyBorder(0, 10, 0, 10));
word.setBorder(BorderFactory.createEtchedBorder());
word.setBorder(BorderFactory.createLineBorder(Color.gray, 1));
word.setFont(new Font("Garamond", Font.BOLD, 17));
suggestionWidget.setFont(new Font("Calibri", Font.BOLD, 17));
header.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 8));
formX.add(BorderLayout.PAGE_START, header);
formX.setBorder(BorderFactory.createEmptyBorder(10, 15, 10, 10));
add(header, BorderLayout.NORTH);
speechPartAndDefinitionWidget = new JList(speechPartAndDefinitionWidgetModel);
speechPartAndDefinitionWidget.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
speechPartAndDefinitionWidget.addListSelectionListener(new ListSelectionListener()
{
public void valueChanged(ListSelectionEvent ev)
{
onDefinitionSelected(ev);
}
});
JPanel formBottom = new JPanel();
formBottom.setLayout(new GridBagLayout());
add(formBottom, BorderLayout.CENTER);
Component up = new JScrollPane(speechPartAndDefinitionWidget);
formBottom.setBorder(BorderFactory.createEmptyBorder(20, 10, 10, 10)); speechPartAndDefinitionWidget.setBorder(BorderFactory.createLineBorder(Color.black,1));
JPanel down = new JPanel();
down.setLayout(new BorderLayout());
down.setBorder(BorderFactory.createLineBorder(Color.black, 1));
down.setBorder(BorderFactory.createEmptyBorder(10, 10, 10, 10));
down.add(translatedWidget = new JList(translatedWidgetModel = new DefaultListModel()));
add(down, BorderLayout.CENTER);
translatedWidget.setBorder(BorderFactory.createLineBorder(Color.black, 1));
translatedWidget.setFont(new Font("Calibri",Font.BOLD, 17));
speechPartAndDefinitionWidget.setFont(new Font("Calibri", Font.BOLD, 17));
add(BorderLayout.CENTER, new JSplitPane(JSplitPane.VERTICAL_SPLIT, up, down));
word.addKeyListener(new KeyAdapter()
{
public void keyPressed(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_ESCAPE)
{
hideSuggestionWindowToBack();
}
else if (e.getKeyCode() == KeyEvent.VK_ENTER)
{
int selectedIndex = suggestionWidget.getSelectedIndex();
if (selectedIndex == -1)
{
onSearchClick();
}
else
{
onSuggestionSelected(selectedIndex);
}
}
}
public void keyReleased(KeyEvent e)
{
if (e.getKeyCode() == KeyEvent.VK_ENTER)
{
hideSuggestionWindowToBack();
onSearchClick();
}
}
});
translators.addActionListener(new
ActionListener()
{
public void actionPerformed
(ActionEvent e)
{
onTranslatorsClick();
}
}
);
word.addKeyListener(new
KeyAdapter()
{
public void keyPressed
(KeyEvent
e)
{
if (suggestionWidgetModel.isEmpty())
{
return;
}
if (e.getKeyCode() == KeyEvent.VK_DOWN)
{
final Point location = word.getLocationOnScreen();
javaWindow.setLocation(location.x, location.y + word.getHeight());
showSuggestionWindowToBack();
int currentSelectedItemIndex = suggestionWidget.getSelectedIndex();
if (currentSelectedItemIndex == -1 || currentSelectedItemIndex == suggestionWidgetModel.size() - 1)
{
suggestionWidget.setSelectedIndex(0);
}
else if (currentSelectedItemIndex < suggestionWidgetModel.size() - 1)
{
suggestionWidget.setSelectedIndex(currentSelectedItemIndex + 1);
}
}
else if (e.getKeyCode() == KeyEvent.VK_UP)
{
int currentSelectedItemIndex = suggestionWidget.getSelectedIndex();
if (currentSelectedItemIndex == -1 || currentSelectedItemIndex == suggestionWidgetModel.size() + 1)
{
suggestionWidget.setSelectedIndex(0);
}
else if (currentSelectedItemIndex < suggestionWidgetModel.size() + 1)
{
suggestionWidget.setSelectedIndex(currentSelectedItemIndex - 1);
}
}
}
}
);
suggestionWidget.addMouseListener(new MouseAdapter()
{
#Override
public void mousePressed(MouseEvent e)
{
int selectedIndex = suggestionWidget.getSelectedIndex();
if (e.getClickCount() == 2)
{
if (selectedIndex < -1)
{
onSearchClick();
}
else
{
onSuggestionSelected(selectedIndex);
hideSuggestionWindowToBack();
}
}
}
public void mouseReleased(MouseEvent e)
{
if (e.getClickCount() == 2)
{
{
hideSuggestionWindowToBack();
}
}
}
});
speechPartAndDefinitionWidget.addKeyListener(new
KeyAdapter()
{
#Override
public void keyPressed
(KeyEvent
e)
{
if (speechPartAndDefinitionWidgetModel.isEmpty())
{
return;
}
if (e.getKeyCode() == KeyEvent.VK_DOWN)
{
int currentSelectedItemIndex = speechPartAndDefinitionWidget.getSelectedIndex();
if (currentSelectedItemIndex == -1 || currentSelectedItemIndex == speechPartAndDefinitionWidgetModel.size() - 1)
{
speechPartAndDefinitionWidget.setSelectedIndex(0);
}
else if (currentSelectedItemIndex < speechPartAndDefinitionWidgetModel.size() - 1)
{
speechPartAndDefinitionWidget.setSelectedIndex(currentSelectedItemIndex + 1);
onTranslate();
}
}
else if (e.getKeyCode() == KeyEvent.VK_UP)
{
int currentSelectedItemIndex = speechPartAndDefinitionWidget.getSelectedIndex();
if (currentSelectedItemIndex == -1 || currentSelectedItemIndex == speechPartAndDefinitionWidgetModel.size() + 1)
{
speechPartAndDefinitionWidget.setSelectedIndex(0);
}
else if (currentSelectedItemIndex < speechPartAndDefinitionWidgetModel.size() + 1)
{
speechPartAndDefinitionWidget.setSelectedIndex(currentSelectedItemIndex - 1);
}
}
}
}
);
speechPartAndDefinitionWidget.addMouseMotionListener(new MouseMotionAdapter()
{
#Override
public void mouseMoved(MouseEvent e)
{
final int x = e.getX();
final int y = e.getY();
final Rectangle cellBounds = speechPartAndDefinitionWidget.getCellBounds(0, speechPartAndDefinitionWidget.getModel().getSize() - 1);
if (cellBounds != null && cellBounds.contains(x, y))
{
speechPartAndDefinitionWidget.setCursor(new Cursor(Cursor.HAND_CURSOR));
}
else
{
speechPartAndDefinitionWidget.setCursor(new Cursor(Cursor.DEFAULT_CURSOR));
}
}
}
);
speechPartAndDefinitionWidget.setCellRenderer(new
DefaultListCellRenderer()
{
#Override
public Component getListCellRendererComponent
(JList
list, Object
value, int index,
boolean isSelected,
boolean cellHasFocus)
{
final String speechPart = ((DefinitionUiModel) value).getPart().getFriendlyName();
final String definition = ((DefinitionUiModel) value).getDefinition().toString();
Color bg = null;
Color fg = null;
final JLabel renderer = new JLabel(
"<html><font color=red>" + speechPart + "</font>) => <font color=black>" + definition + "</font></html>");
if (renderer.isEnabled())
{
if (isSelected)
{
renderer.setText("<html><font color=gray>" + speechPart + "</font><font color=blue><u><b>" + definition + "</b></u></font></html>");
renderer.setCursor(new Cursor(Cursor.HAND_CURSOR));
}
JList.DropLocation dropLocation = list.getDropLocation();
if (dropLocation != null
&& !dropLocation.isInsert()
&& dropLocation.getIndex() == index)
{
bg = DefaultLookup.getColor(this, ui, "List.dropCellBackground");
fg = DefaultLookup.getColor(this, ui, "List.dropCellForeground");
isSelected = true;
}
if (isSelected)
{
renderer.setBackground(bg == null ? list.getSelectionBackground() : bg);
renderer.setForeground(fg == null ? list.getSelectionForeground() : fg);
}
Border border = null;
if (cellHasFocus)
{
if (isSelected)
{
border = DefaultLookup.getBorder(this, ui, "List.focusSelectedCellHighlightBorder");
}
if (border == null)
{
border = DefaultLookup.getBorder(this, ui, "List.focusCellHighlightBorder");
}
}
else
{
}
}
return renderer;
}
}
);
translatedWidget.setForeground(Color.black);
translate.addActionListener(new
ActionListener()
{
public void actionPerformed
(ActionEvent
e)
{
onTranslate();
}
}
);
search.setToolTipText("find");
search.addActionListener(new
ActionListener()
{
public void actionPerformed
(ActionEvent
e)
{
onSearchClick();
}
}
);
translators.setSelectedIndex(0);
suggestionWidget.setBorder(BorderFactory.createLineBorder(Color.gray, 1));
onTranslatorsClick();
}
private void onSuggestionSelected(int selectedIndex)
{
String hold = (String) suggestionWidgetModel.getElementAt(selectedIndex);
word.setText(hold);
hideSuggestionWindowToBack();
suggestionWidgetModel.clear();
if (javaWindow == null)
{
javaWindow.dispose();
javaWindow = null;
}
}
public void onWordUpdated(final String toComplete) throws ClassNotFoundException, SQLException
{
new Thread(new Runnable()
{
public void run()
{
try
{
final List<Suggestion> suggestions = suggestor.getSuggestions(toComplete);
SwingUtilities.invokeLater(new Runnable()
{
public void run()
{
speechPartAndDefinitionWidgetModel.clear();
translatedWidgetModel.clear();
suggestionWidgetModel.clear();
try
{
for (Suggestion suggestion : suggestions)
{
suggestionWidgetModel.addElement(suggestion.getCaption());
}
if (!suggestions.isEmpty())
{
suggestionWidget.setSelectedIndex(0);
if (javaWindow == null)
{
javaWindow = new JavaWindow(suggestionWidget);
}
else
{
final Point location = word.getLocationOnScreen();
javaWindow.setLocation(location.x, location.y + word.getHeight());
}
showSuggestionWindowToBack();
}
else
{
hideSuggestionWindowToBack();
}
}
catch (Exception exception)
{
exception.printStackTrace();
}
}
});
}
catch (SQLException e)
{
onSqlError(e);
}
}
}
, "onWordUpdated").
start();
}
private void onTranslate()
{
try
{
translatedWidgetModel.clear();
String lookupWord = word.getText();
if (lookupWord != null)
{
Collection<String> bisayaWords = this.translator.translateSimple(lookupWord);
for (String bisayaWord : bisayaWords)
{
translatedWidgetModel.addElement(bisayaWord.toUpperCase());
}
}
}
catch (SQLException ex)
{
onSqlError(ex);
}
}
private void onSqlError(SQLException ex)
{
JOptionPane.showMessageDialog(null, "SQL Error! :" + ex.getMessage());
}
private void onDefinitionSelected(ListSelectionEvent ev)
{
if (!ev.getValueIsAdjusting())
{
int selectedIndex = speechPartAndDefinitionWidget.getSelectedIndex();
if (selectedIndex != -1)
{
final DefinitionUiModel definitionUiModel = (DefinitionUiModel) speechPartAndDefinitionWidgetModel.get(selectedIndex);
translate(definitionUiModel.getDefinition());
}
}
}
private void translate(Definition definition)
{
try
{
translatedWidgetModel.clear();
Map<String, String> map = new HashMap<String, String>();
int definitionId = definition.getId();
String definitionName = definition.getValue();
int nameId = translator.getFromDictionary().getNameIdForDefinitionId(definitionId);
if (nameId > -1)
{
final Collection<String> translation = translator.translateSimple(nameId);
for (String transWord : translation)
{
map.put(transWord, definitionName);
for (Map.Entry<String, String> entry : map.entrySet())
{
String myValue = entry.getKey().toUpperCase() + " -- " + entry.getValue();
translatedWidgetModel.addElement(myValue);
}
}
}
}
catch (SQLException ex)
{
onSqlError(ex);
}
}
private void onSearchClick()
{
search.setEnabled(true);
hideSuggestionWindowToBack();
speechPartAndDefinitionWidgetModel.clear();
translatedWidgetModel.clear();
try
{
final String lookupWord = word.getText();
if (lookupWord != null)
{
final Dictionary fromDictionary = translator.getFromDictionary();
final WordDefinitions definitions = fromDictionary.getWordDefinitions(lookupWord);
final Iterator<Map.Entry<SpeechPart, List<Definition>>> items = definitions.iterator();
while (items.hasNext())
{
final Map.Entry<SpeechPart, List<Definition>> item = items.next();
for (Definition definition : item.getValue())
{
speechPartAndDefinitionWidgetModel.addElement(new DefinitionUiModel(item.getKey(), definition));
}
}
}
}
catch (SQLException ex)
{
onSqlError(ex);
}
}
private void onTranslatorsClick()
{
translator = (Translator) translators.getSelectedItem();
suggestor = new Suggestor(translator.getFromDictionary(), 10);
word.setEnabled(true);
application.setTitle(translator.toString());
translators.setToolTipText("tooltip : " + translator.toString());
speechPartAndDefinitionWidgetModel.clear();
}
private void hideSuggestionWindowToBack()
{
if (javaWindow == null)
{
return;
}
javaWindow.setVisible(false);
javaWindow.toBack();
}
private void showSuggestionWindowToBack()
{
if (javaWindow == null)
{
return;
}
javaWindow.setVisible(true);
javaWindow.toFront();
}
}

The algorithm (that I know of) behind the suggestions list is: Longest common substring problem. The problem is quite easy if you have stored the strings in the database in the form of a trie. Then the list of suggestions for the current prefix will be all those strings that start with the currently entered string. You will understand what I mean if you look at the Trie data structure.