repainting the whole frame??

I have a JOptionPane that pops up and asks the user to enter a filename.

i need help with Two questions:

1) my JOptionPane:

String inputValue = JOptionPane.showInputDialog("Please input fileame (including extension)");
filename = inputValue;

passes the entered filename to my global variable "filename". This variable (filename) is used to paint the image onto a JIcon:

ImageIcon icon = new ImageIcon(filename);
JLabel background = new JLabel(icon);
mapPanel.add(background);


What do i need to do to get the loaded image update? Ithough i would just be able to do a :

mapPanel.repaint()

but it doesnt work because it only ever calls the:

this.getContentPane().add(mapPanel, BorderLayout.CENTER);

once. So how do i get it to repaint the whole frame again? this time including the newly updated filename???



2)What do i need to do to add browse functionality to the JOptionPane???

for your first question, after your code:

Code:

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ImageIcon icon = new ImageIcon(filename);
JLabel background = new JLabel(icon);
mapPanel.add(background);

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try just adding the line:

Code:

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repaint();

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just like that, nothin before it. That should do it.


as for the second question you need to use the JFileChooser class. Here is an example from sun:

The following code pops up a file chooser for the user's home directory that sees only .jpg and .gif images:

Code:

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    JFileChooser chooser = new JFileChooser();
    // Note: source for ExampleFileFilter can be found in FileChooserDemo,
    // under the demo/jfc directory in the Java 2 SDK, Standard Edition.
    ExampleFileFilter filter = new ExampleFileFilter();
    filter.addExtension("jpg");
    filter.addExtension("gif");
    filter.setDescription("JPG & GIF Images");
    chooser.setFileFilter(filter);
    int returnVal = chooser.showOpenDialog(parent);
    if(returnVal == JFileChooser.APPROVE_OPTION) {
      System.out.println("You chose to open this file: " +
            chooser.getSelectedFile().getName());
    }

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