How to list only non hidden and non system file in jtree

Question

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

Answer 1

If you are trying to list all files in C:/ please keep in mind that there are other files also which are neither hidden nor system files, but that still won't open because they require special privileges/permissions. So:

String[] files = file.list();

if (files!=null) {
    for (String f : files) open(f);
}

So just compare if the array is null or not and design your recursion in such a way that it just skips those files whose array for the list() function is null.

private void nodes(DefaultMutableTreeNode top, File f) throws IOException {

if (f.isDirectory()) {
    File[] listFiles = f.listFiles();

    if (listFiles != null) {
        DefaultMutableTreeNode b1[] = new DefaultMutableTreeNode[listFiles.length];
        for (int i = 0; i < b1.length; i++) {
            b1[i] = new DefaultMutableTreeNode(listFiles[i].toString());
            top.add(b1[i]);
            File g = new File(b1[i].toString());
            nodes(b1[i], g);
        }
    }
}

Here is the code I used to create a window file explorer using jtree.