JFileChooser not showing up

Question

I have a method that takes a txt file as an input. I used to use string by typing the direct path to the file. But it became burdensome whenever I tried to use different file for an input. I try implementing JFileChooser but with no luck.

This is the code, but nothing happening.

public static JFileChooser choose;
File directory = new File("B:\\");
choose = new JFileChooser(directory);
choose.setVisible(true);        
File openFile = choose.getSelectedFile();

FileReader fR = new FileReader(openFile);
BufferedReader br = new BufferedReader(fR);

Answer 1

As per Java tutorial on How to Use File Choosers:

Bringing up a standard open dialog requires only two lines of code:

//Create a file chooser
final JFileChooser fc = new JFileChooser();
...
//In response to a button click:
int returnVal = fc.showOpenDialog(aComponent);

The argument to the showOpenDialog method specifies the parent component for the dialog. The parent component affects the position of the dialog and the frame that the dialog depends on.

Note as per docs it can also be:

int returnVal = fc.showOpenDialog(null);

If the parent is null, then the dialog depends on no visible window, and it's placed in a look-and-feel-dependent position such as the center of the screen.

  Also have a read on Concurrency in Swing if you haven't already.

Answer 2

No blocking code (as David Kroukamp suggest). It solves "not showing up" problem.

Runnable r = new Runnable() {

@Override
public void run() {
    JFileChooser jfc = new JFileChooser();
    jfc.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
    if( jfc.showOpenDialog(null) == JFileChooser.APPROVE_OPTION ){
        selected = jfc.getSelectedFile();
    }
}
}
SwingUtilities.invokeLater(r);