filefilter

I have a program utilizing a JFileChooser. To be brief, the full program is a GUI which allows users to manipulate PNGs and JPGs. I would like to make it so that the JFileChooser instantly opens to the picture directory (windows). When the user opens their JFileChooser, it would open directly to the pictures library C:\Users\(USER)\Pictures Furthermore, it would be nice to ONLY show files of a specific type (PNGs and JPGs). Many programs seem to be able to do this; only allowing selection of specific files. Does JFileChooser allow such a thing? Currently, I am using a massively unreliable, run

File f=new File("C:/"); File fList[] = f.listFiles(); When i use this it list all system file as well as hidden files. and this cause null pointer exception when i use it to show in jTree like this: public void getList(DefaultMutableTreeNode node, File f) { if(f.isDirectory()) { DefaultMutableTreeNode child = new DefaultMutableTreeNode(f); node.add(child); File fList[] = f.listFiles(); for(int i = 0; i < fList.length; i++) getList(child, fList[i]); } } What should i do so that it do not give NullPointerException and show only non hidden and non system files in jTree? Do this for hidden files:

I know I can make a filter by file type, but is it possible to filter by file size? For example a JFileChooser to show only pictures within 3 MegaBytes. The short answer should be, what have you tried? The long answer is yes... JFileChooser fc = new JFileChooser(); fc.addChoosableFileFilter(new FileFilter() { @Override public boolean accept(File f) { String name = f.getName().toLowerCase(); return (name.endsWith(".png") && name.endsWith(".jpg") && name.endsWith(".gif") && name.endsWith(".bmp") && f.length() < 3 * (1024 * 1024)); } @Override public String getDescription() { return "Images < 3mb

I want to restrict a JFileChooser to select only mp3 files. But, the following code allows all file types: FileFilter filter = new FileNameExtensionFilter("MP3 File","mp3"); fileChooser.addChoosableFileFilter(filter); fileChooser.showOpenDialog(frame); File file = fileChooser.getSelectedFile(); Try and use fileChooser.setFileFilter(filter) instead of fileChooser.addChoosableFileFilter(filter); Try: FileFilter filter = new FileNameExtensionFilter("My mp3 description", "mp3"); The first argument is simply a description of the FileNameExtensionFilter - and since the second argument is var args,

like in title how to make filter to .txt files? i wrote something like this but it has error :( private void jMenuItem1ActionPerformed(java.awt.event.ActionEvent evt) { JFileChooser chooser = new JFileChooser(); int retval = chooser.showOpenDialog(null); String yourpath = "E:\\Programy Java\\Projekt_SR1\\src\\project_sr1"; File directory = new File(yourpath); String[] myFiles; FilenameFilter filter = new FilenameFilter() { public boolean accept(File directory, String fileName) { return fileName.endsWith(".txt"); } }; myFiles = directory.list(filter); if(retval == JFileChooser.APPROVE_OPTION) {