Example usage for javax.swing JMenu JMenu

List of usage examples for javax.swing JMenu JMenu

  1. HOME
  2. Java
  3. javax
  4. javax.swing.*
  5. JMenu
  6. JMenu

Introduction

In this page you can find the example usage for javax.swing JMenu JMenu.

Prototype

public JMenu(Action a)

Source Link

Document

Constructs a menu whose properties are taken from the Action supplied.

Usage

From source file:MessageDigestTest.java

public MessageDigestFrame() {
    setTitle("MessageDigestTest");
    setSize(400, 200);/*from   w ww .  j  a  va 2  s .  com*/
    addWindowListener(new WindowAdapter() {
        public void windowClosing(WindowEvent e) {
            System.exit(0);
        }
    });

    JPanel panel = new JPanel();
    ButtonGroup group = new ButtonGroup();
    ActionListener listener = new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            JCheckBox b = (JCheckBox) event.getSource();
            setAlgorithm(b.getText());
        }
    };
    addCheckBox(panel, "SHA-1", group, true, listener);
    addCheckBox(panel, "MD5", group, false, listener);

    Container contentPane = getContentPane();

    contentPane.add(panel, "North");
    contentPane.add(new JScrollPane(message), "Center");
    contentPane.add(digest, "South");
    digest.setFont(new Font("Monospaced", Font.PLAIN, 12));

    setAlgorithm("SHA-1");

    JMenuBar menuBar = new JMenuBar();
    JMenu menu = new JMenu("File");
    JMenuItem fileDigestItem = new JMenuItem("File digest");
    fileDigestItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            loadFile();
        }
    });
    menu.add(fileDigestItem);
    JMenuItem textDigestItem = new JMenuItem("Text area digest");
    textDigestItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            String m = message.getText();
            computeDigest(m.getBytes());
        }
    });
    menu.add(textDigestItem);
    menuBar.add(menu);
    setJMenuBar(menuBar);
}

From source file:ImageViewer.java

public ImageViewerFrame() {
    setTitle("ImageViewer");
    setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

    // use a label to display the images
    label = new JLabel();
    add(label);/*from   w  w  w  .  j a  v a 2  s . c o m*/

    // set up the file chooser
    chooser = new JFileChooser();
    chooser.setCurrentDirectory(new File("."));

    // set up the menu bar
    JMenuBar menuBar = new JMenuBar();
    setJMenuBar(menuBar);

    JMenu menu = new JMenu("File");
    menuBar.add(menu);

    JMenuItem openItem = new JMenuItem("Open");
    menu.add(openItem);
    openItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            // show file chooser dialog
            int result = chooser.showOpenDialog(null);

            // if file selected, set it as icon of the label
            if (result == JFileChooser.APPROVE_OPTION) {
                String name = chooser.getSelectedFile().getPath();
                label.setIcon(new ImageIcon(name));
            }
        }
    });

    JMenuItem exitItem = new JMenuItem("Exit");
    menu.add(exitItem);
    exitItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            System.exit(0);
        }
    });
}

From source file:MenuTest.java

public MenuFrame() {
    setTitle("MenuTest");
    setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

    JMenu fileMenu = new JMenu("File");
    fileMenu.add(new TestAction("New"));

    // demonstrate accelerators

    JMenuItem openItem = fileMenu.add(new TestAction("Open"));
    openItem.setAccelerator(KeyStroke.getKeyStroke("ctrl O"));

    fileMenu.addSeparator();//from ww w.  ja v  a2s. co m

    saveAction = new TestAction("Save");
    JMenuItem saveItem = fileMenu.add(saveAction);
    saveItem.setAccelerator(KeyStroke.getKeyStroke("ctrl S"));

    saveAsAction = new TestAction("Save As");
    fileMenu.add(saveAsAction);
    fileMenu.addSeparator();

    fileMenu.add(new AbstractAction("Exit") {
        public void actionPerformed(ActionEvent event) {
            System.exit(0);
        }
    });

    // demonstrate check box and radio button menus

    readonlyItem = new JCheckBoxMenuItem("Read-only");
    readonlyItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            boolean saveOk = !readonlyItem.isSelected();
            saveAction.setEnabled(saveOk);
            saveAsAction.setEnabled(saveOk);
        }
    });

    ButtonGroup group = new ButtonGroup();

    JRadioButtonMenuItem insertItem = new JRadioButtonMenuItem("Insert");
    insertItem.setSelected(true);
    JRadioButtonMenuItem overtypeItem = new JRadioButtonMenuItem("Overtype");

    group.add(insertItem);
    group.add(overtypeItem);

    // demonstrate icons

    Action cutAction = new TestAction("Cut");
    cutAction.putValue(Action.SMALL_ICON, new ImageIcon("cut.gif"));
    Action copyAction = new TestAction("Copy");
    copyAction.putValue(Action.SMALL_ICON, new ImageIcon("copy.gif"));
    Action pasteAction = new TestAction("Paste");
    pasteAction.putValue(Action.SMALL_ICON, new ImageIcon("paste.gif"));

    JMenu editMenu = new JMenu("Edit");
    editMenu.add(cutAction);
    editMenu.add(copyAction);
    editMenu.add(pasteAction);

    // demonstrate nested menus

    JMenu optionMenu = new JMenu("Options");

    optionMenu.add(readonlyItem);
    optionMenu.addSeparator();
    optionMenu.add(insertItem);
    optionMenu.add(overtypeItem);

    editMenu.addSeparator();
    editMenu.add(optionMenu);

    // demonstrate mnemonics

    JMenu helpMenu = new JMenu("Help");
    helpMenu.setMnemonic('H');

    JMenuItem indexItem = new JMenuItem("Index");
    indexItem.setMnemonic('I');
    helpMenu.add(indexItem);

    // you can also add the mnemonic key to an action
    Action aboutAction = new TestAction("About");
    aboutAction.putValue(Action.MNEMONIC_KEY, new Integer('A'));
    helpMenu.add(aboutAction);

    // add all top-level menus to menu bar

    JMenuBar menuBar = new JMenuBar();
    setJMenuBar(menuBar);

    menuBar.add(fileMenu);
    menuBar.add(editMenu);
    menuBar.add(helpMenu);

    // demonstrate pop-ups

    popup = new JPopupMenu();
    popup.add(cutAction);
    popup.add(copyAction);
    popup.add(pasteAction);

    JPanel panel = new JPanel();
    panel.setComponentPopupMenu(popup);
    add(panel);

    // the following line is a workaround for bug 4966109
    panel.addMouseListener(new MouseAdapter() {
    });
}

From source file:org.pgptool.gui.ui.keyslist.KeysListView.java

private void initMenuBar() {
    menuBar = new JMenuBar();
    JMenu menuTs = new JMenu(Messages.get("term.actions"));
    menuTs.add(miImport = new JMenuItem());
    menuTs.add(miCreate = new JMenuItem());
    menuTs.addSeparator();//from  w  w w.  java 2s . c  o m
    menuTs.add(miExportPublicKeys = new JMenuItem());
    menuTs.addSeparator();
    menuTs.add(miClose = new JMenuItem());
    menuBar.add(menuTs);
}

From source file:XPathTest.java

public XPathFrame() {
        setTitle("XPathTest");

        JMenu fileMenu = new JMenu("File");
        JMenuItem openItem = new JMenuItem("Open");
        openItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                openFile();//w w w .ja  va 2s  .  c  o  m
            }
        });
        fileMenu.add(openItem);

        JMenuItem exitItem = new JMenuItem("Exit");
        exitItem.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                System.exit(0);
            }
        });
        fileMenu.add(exitItem);

        JMenuBar menuBar = new JMenuBar();
        menuBar.add(fileMenu);
        setJMenuBar(menuBar);

        ActionListener listener = new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                evaluate();
            }
        };
        expression = new JTextField(20);
        expression.addActionListener(listener);
        JButton evaluateButton = new JButton("Evaluate");
        evaluateButton.addActionListener(listener);

        typeCombo = new JComboBox(new Object[] { "STRING", "NODE", "NODESET", "NUMBER", "BOOLEAN" });
        typeCombo.setSelectedItem("STRING");

        JPanel panel = new JPanel();
        panel.add(expression);
        panel.add(typeCombo);
        panel.add(evaluateButton);
        docText = new JTextArea(10, 40);
        result = new JTextField();
        result.setBorder(new TitledBorder("Result"));

        add(panel, BorderLayout.NORTH);
        add(new JScrollPane(docText), BorderLayout.CENTER);
        add(result, BorderLayout.SOUTH);

        try {
            DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
            builder = factory.newDocumentBuilder();
        } catch (ParserConfigurationException e) {
            JOptionPane.showMessageDialog(this, e);
        }

        XPathFactory xpfactory = XPathFactory.newInstance();
        path = xpfactory.newXPath();
        pack();
    }

From source file:BeanContainer.java

  protected JMenuBar createMenuBar() {
  JMenuBar menuBar = new JMenuBar();
    //from   ww  w . j a  v a2  s  . c om
  JMenu mFile = new JMenu("File");

  JMenuItem mItem = new JMenuItem("New...");
  ActionListener lst = new ActionListener() { 
    public void actionPerformed(ActionEvent e) {  
      Thread newthread = new Thread() {
        public void run() {
          String result = (String)JOptionPane.showInputDialog(
            BeanContainer.this, 
            "Please enter class name to create a new bean", 
            "Input", JOptionPane.INFORMATION_MESSAGE, null, 
            null, m_className);
          repaint();
          if (result==null)
            return;
          try {
            m_className = result;
            Class cls = Class.forName(result);
            Object obj = cls.newInstance();
            if (obj instanceof Component) {
              m_activeBean = (Component)obj;
              m_activeBean.addFocusListener(
                BeanContainer.this);
              m_activeBean.requestFocus();
              getContentPane().add(m_activeBean);
            }
            validate();
          }
          catch (Exception ex) {
            ex.printStackTrace();
            JOptionPane.showMessageDialog(
              BeanContainer.this, "Error: "+ex.toString(),
              "Warning", JOptionPane.WARNING_MESSAGE);
          }
        }
      };
      newthread.start();
    }
  };
  mItem.addActionListener(lst);
  mFile.add(mItem);

  mItem = new JMenuItem("Load...");
  lst = new ActionListener() { 
    public void actionPerformed(ActionEvent e) {  
      Thread newthread = new Thread() {
        public void run() {
          m_chooser.setCurrentDirectory(m_currentDir);
          m_chooser.setDialogTitle(
            "Please select file with serialized bean");
          int result = m_chooser.showOpenDialog(
            BeanContainer.this);
          repaint();
          if (result != JFileChooser.APPROVE_OPTION)
            return;
          m_currentDir = m_chooser.getCurrentDirectory();
          File fChoosen = m_chooser.getSelectedFile();
          try {
            FileInputStream fStream = 
              new FileInputStream(fChoosen);
            ObjectInput  stream  =  
              new ObjectInputStream(fStream);
            Object obj = stream.readObject();
            if (obj instanceof Component) {
              m_activeBean = (Component)obj;
              m_activeBean.addFocusListener(
                BeanContainer.this);
              m_activeBean.requestFocus();
              getContentPane().add(m_activeBean);
            }
            stream.close();
            fStream.close();
            validate();
          }
          catch (Exception ex) {
            ex.printStackTrace();
            JOptionPane.showMessageDialog(
              BeanContainer.this, "Error: "+ex.toString(),
              "Warning", JOptionPane.WARNING_MESSAGE);
          }
          repaint();
        }
      };
      newthread.start();
    }
  };
  mItem.addActionListener(lst);
  mFile.add(mItem);

  mItem = new JMenuItem("Save...");
  lst = new ActionListener() { 
    public void actionPerformed(ActionEvent e) {
      Thread newthread = new Thread() {
        public void run() {
          if (m_activeBean == null)
            return;
          m_chooser.setDialogTitle(
            "Please choose file to serialize bean");
          m_chooser.setCurrentDirectory(m_currentDir);
          int result = m_chooser.showSaveDialog(
            BeanContainer.this);
          repaint();
          if (result != JFileChooser.APPROVE_OPTION)
            return;
          m_currentDir = m_chooser.getCurrentDirectory();
          File fChoosen = m_chooser.getSelectedFile();
          try {
            FileOutputStream fStream = 
              new FileOutputStream(fChoosen);
            ObjectOutput stream  =  
              new ObjectOutputStream(fStream);
            stream.writeObject(m_activeBean);
            stream.close();
            fStream.close();
          }
          catch (Exception ex) {
            ex.printStackTrace();
          JOptionPane.showMessageDialog(
            BeanContainer.this, "Error: "+ex.toString(),
            "Warning", JOptionPane.WARNING_MESSAGE);
          }
        }
      };
      newthread.start();
    }
  };
  mItem.addActionListener(lst);
  mFile.add(mItem);

  mFile.addSeparator();

  mItem = new JMenuItem("Exit");
  lst = new ActionListener() { 
    public void actionPerformed(ActionEvent e) {
      System.exit(0);
    }
  };
  mItem.addActionListener(lst);
  mFile.add(mItem);
  menuBar.add(mFile);
    
  JMenu mEdit = new JMenu("Edit");

  mItem = new JMenuItem("Delete");
  lst = new ActionListener() { 
    public void actionPerformed(ActionEvent e) {
      if (m_activeBean == null)
        return;
      Object obj = m_editors.get(m_activeBean);
      if (obj != null) {
        BeanEditor editor = (BeanEditor)obj;
        editor.dispose();
        m_editors.remove(m_activeBean);
      }
      getContentPane().remove(m_activeBean);
      m_activeBean = null;
      validate();
      repaint();
    }
  };
  mItem.addActionListener(lst);
  mEdit.add(mItem);

  mItem = new JMenuItem("Properties...");
  lst = new ActionListener() { 
    public void actionPerformed(ActionEvent e) {
      if (m_activeBean == null)
        return;
      Object obj = m_editors.get(m_activeBean);
      if (obj != null) {
        BeanEditor editor = (BeanEditor)obj;
        editor.setVisible(true);
        editor.toFront();
      }
      else {
        BeanEditor editor = new BeanEditor(m_activeBean);
        m_editors.put(m_activeBean, editor);
      }
    }
  };
  mItem.addActionListener(lst);
  mEdit.add(mItem);
  menuBar.add(mEdit);

  JMenu mLayout = new JMenu("Layout");
  ButtonGroup group = new ButtonGroup();

  mItem = new JRadioButtonMenuItem("FlowLayout");
  mItem.setSelected(true);
  lst = new ActionListener() { 
    public void actionPerformed(ActionEvent e){
      getContentPane().setLayout(new FlowLayout());
      validate();
      repaint();
    }
  };
  mItem.addActionListener(lst);
  group.add(mItem);
  mLayout.add(mItem);

  mItem = new JRadioButtonMenuItem("GridLayout");
  lst = new ActionListener() { 
    public void actionPerformed(ActionEvent e){
      int col = 3;
      int row = (int)Math.ceil(getContentPane().
        getComponentCount()/(double)col);
      getContentPane().setLayout(new GridLayout(row, col, 10, 10));
      validate();
      repaint();
    }
  };
  mItem.addActionListener(lst);
  group.add(mItem);
  mLayout.add(mItem);
    
  mItem = new JRadioButtonMenuItem("BoxLayout - X");
  lst = new ActionListener() { 
    public void actionPerformed(ActionEvent e) {
      getContentPane().setLayout(new BoxLayout(
        getContentPane(), BoxLayout.X_AXIS));
      validate();
      repaint();
    }
  };
  mItem.addActionListener(lst);
  group.add(mItem);
  mLayout.add(mItem);
    
  mItem = new JRadioButtonMenuItem("BoxLayout - Y");
  lst = new ActionListener() { 
    public void actionPerformed(ActionEvent e) {
      getContentPane().setLayout(new BoxLayout(
        getContentPane(), BoxLayout.Y_AXIS));
      validate();
      repaint();
    }
  };
  mItem.addActionListener(lst);
  group.add(mItem);
  mLayout.add(mItem);
    
  mItem = new JRadioButtonMenuItem("DialogLayout");
  lst = new ActionListener() { 
    public void actionPerformed(ActionEvent e) {
      getContentPane().setLayout(new DialogLayout());
      validate();
      repaint();
    }
  };
  mItem.addActionListener(lst);
  group.add(mItem);
  mLayout.add(mItem);

  menuBar.add(mLayout);

  return menuBar;
}

From source file:DataExchangeTest.java

public DataExchangeFrame() {
    setTitle("DataExchangeTest");
    setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

    // construct a File menu

    JMenuBar mbar = new JMenuBar();
    setJMenuBar(mbar);/*from www.  j a v  a 2 s .  co m*/
    JMenu fileMenu = new JMenu("File");
    mbar.add(fileMenu);

    // add Connect and Exit menu items

    JMenuItem connectItem = new JMenuItem("Connect");
    connectItem.addActionListener(new ConnectAction());
    fileMenu.add(connectItem);

    // The Exit item exits the program

    JMenuItem exitItem = new JMenuItem("Exit");
    exitItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            System.exit(0);
        }
    });
    fileMenu.add(exitItem);

    textArea = new JTextArea();
    add(new JScrollPane(textArea), BorderLayout.CENTER);
}

From source file:ZipTest.java

public ZipTestFrame() {
    setTitle("ZipTest");
    setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

    // add the menu and the Open and Exit menu items
    JMenuBar menuBar = new JMenuBar();
    JMenu menu = new JMenu("File");

    JMenuItem openItem = new JMenuItem("Open");
    menu.add(openItem);/*from www. ja  va2s . co  m*/
    openItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            JFileChooser chooser = new JFileChooser();
            chooser.setCurrentDirectory(new File("."));
            int r = chooser.showOpenDialog(ZipTestFrame.this);
            if (r == JFileChooser.APPROVE_OPTION) {
                zipname = chooser.getSelectedFile().getPath();
                fileCombo.removeAllItems();
                scanZipFile();
            }
        }
    });

    JMenuItem exitItem = new JMenuItem("Exit");
    menu.add(exitItem);
    exitItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            System.exit(0);
        }
    });

    menuBar.add(menu);
    setJMenuBar(menuBar);

    // add the text area and combo box
    fileText = new JTextArea();
    fileCombo = new JComboBox();
    fileCombo.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            loadZipFile((String) fileCombo.getSelectedItem());
        }
    });

    add(fileCombo, BorderLayout.SOUTH);
    add(new JScrollPane(fileText), BorderLayout.CENTER);
}

From source file:com.game.ui.views.MapEditor.java

public void generateGUI() throws IOException {
    setDefaultCloseOperation(DISPOSE_ON_CLOSE);
    //        setResizable(false);
    JMenuBar menubar = new JMenuBar();
    ImageIcon icon = null;/*ww  w .j a  v a2s  . c  o  m*/
    try {
        icon = GameUtils.shrinkImage("save.png", 20, 20);
    } catch (IOException e) {
        System.out.println("Dialog : showDialogForMap(): Exception occured :" + e);
        e.printStackTrace();
    }
    JMenu file = new JMenu("File");
    JMenuItem save = new JMenuItem("Save", icon);
    save.setToolTipText("Save Map Information");
    save.setActionCommand("Save Map");
    save.addActionListener(this);
    file.add(save);
    menubar.add(file);
    setJMenuBar(menubar);
    JPanel topPanel = new JPanel();
    topPanel.setBorder(BorderFactory.createLineBorder(Color.BLACK));
    topPanel.setLayout(new GridBagLayout());
    JLabel headerLbl = new JLabel("Legend : ");
    headerLbl.setFont(new Font("Times New Roman", Font.BOLD, 15));
    JLabel lbl1 = new JLabel();
    lbl1.setPreferredSize(new Dimension(50, 20));
    lbl1.setBackground(Configuration.pathColor);
    lbl1.setOpaque(true);
    JLabel lbl2 = new JLabel("- Represents the path.");
    JLabel lbl3 = new JLabel();
    lbl3.setPreferredSize(new Dimension(50, 20));
    lbl3.setBackground(Configuration.enemyColor);
    lbl3.setOpaque(true);
    JLabel lbl4 = new JLabel("- Represents the path with monsters");
    JLabel lbl5 = new JLabel();
    lbl5.setPreferredSize(new Dimension(50, 20));
    lbl5.setBackground(Configuration.startPointColor);
    lbl5.setOpaque(true);
    JLabel lbl6 = new JLabel("- Represents the starting point in the path");
    JLabel lbl7 = new JLabel();
    lbl7.setBackground(Configuration.endPointColor);
    lbl7.setOpaque(true);
    lbl7.setPreferredSize(new Dimension(50, 20));
    JLabel lbl8 = new JLabel("- Ending point in the path");
    GridBagConstraints c = new GridBagConstraints();
    c.fill = GridBagConstraints.HORIZONTAL;
    c.gridx = 0;
    c.weightx = 1;
    c.weighty = 0;
    c.insets = new Insets(5, 5, 5, 5);
    c.gridwidth = 2;
    topPanel.add(headerLbl, c);
    c.fill = GridBagConstraints.NONE;
    c.gridx = 0;
    c.gridy = 1;
    c.weightx = 0;
    c.weighty = 0;
    c.gridwidth = 1;
    c.ipadx = 5;
    c.ipady = 5;
    topPanel.add(lbl1, c);
    c.gridx = 1;
    c.anchor = GridBagConstraints.FIRST_LINE_START;
    topPanel.add(lbl2, c);
    c.gridx = 0;
    c.gridy = 2;
    topPanel.add(lbl3, c);
    c.gridx = 1;
    topPanel.add(lbl4, c);
    c.gridx = 0;
    c.gridy = 3;
    topPanel.add(lbl5, c);
    c.gridx = 1;
    topPanel.add(lbl6, c);
    c.gridx = 0;
    c.gridy = 4;
    topPanel.add(lbl7, c);
    c.gridx = 1;
    topPanel.add(lbl8, c);
    add(topPanel, BorderLayout.NORTH);
    bottomPanel = new JPanel();
    add(bottomPanel, BorderLayout.CENTER);
    bottomPanel.setBorder(new EmptyBorder(5, 5, 5, 5));
    //        bottomPanel.add(new JButton("kaushik"));
    pack();
    setExtendedState(JFrame.MAXIMIZED_BOTH);
    GraphicsEnvironment env = GraphicsEnvironment.getLocalGraphicsEnvironment();
    setMaximizedBounds(env.getMaximumWindowBounds());
    setVisible(true);
    callDialogForUsersInput();
}

From source file:FileChooserTest.java

public ImageViewerFrame() {
    setTitle("FileChooserTest");
    setSize(DEFAULT_WIDTH, DEFAULT_HEIGHT);

    // set up menu bar
    JMenuBar menuBar = new JMenuBar();
    setJMenuBar(menuBar);/*  www.ja v a2  s.  com*/

    JMenu menu = new JMenu("File");
    menuBar.add(menu);

    JMenuItem openItem = new JMenuItem("Open");
    menu.add(openItem);
    openItem.addActionListener(new FileOpenListener());

    JMenuItem exitItem = new JMenuItem("Exit");
    menu.add(exitItem);
    exitItem.addActionListener(new ActionListener() {
        public void actionPerformed(ActionEvent event) {
            System.exit(0);
        }
    });

    // use a label to display the images
    label = new JLabel();
    add(label);

    // set up file chooser
    chooser = new JFileChooser();

    // accept all image files ending with .jpg, .jpeg, .gif
    /*
    final ExtensionFileFilter filter = new ExtensionFileFilter();
    filter.addExtension("jpg");
    filter.addExtension("jpeg");
    filter.addExtension("gif");
    filter.setDescription("Image files");
    */
    FileNameExtensionFilter filter = new FileNameExtensionFilter("Image files", "jpg", "jpeg", "gif");
    chooser.setFileFilter(filter);

    chooser.setAccessory(new ImagePreviewer(chooser));

    chooser.setFileView(new FileIconView(filter, new ImageIcon("palette.gif")));
}