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  1. #1
    collin389 is offline Senior Member
    Join Date
    Nov 2009
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    Default JTree only display .txt

    Ok, so I have a JTree that I use to display files that are on my computer. Is there a way to make it display only .java files and directories? I made it so that it will only display them, but for every other file, it leaves a blank space where the file is.

    here is my getChild()
    Java Code:
    public Object getChild(Object parent, int index) {
             File directory = (File) parent;
             String[] children = directory.list();
             if (((children[index].length() >= 5) && children[index].substring(children[index].length()-4).equals("java")) || (new File(directory, children[index]).isDirectory()))
                return new TreeFile(directory, children[index]);
             return new TreeFile(directory, "NULL");
    I don't know if what I tried was in the wrong direction or what I have to do to make it work.

    I am trying to edit the code from File System Tree : Tree**Swing JFC**Java to make it only display .java files

  2. #2
    macason is offline Member
    Join Date
    Nov 2009
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    IMO this is a better example of a tree at play ...


    Just remove the books and create a recursive function to crawl through your file system from a root node, something like ...

    Java Code:
    public DefaultMutableTreeNode buildtree(String rootOfFileSystem){
        File myFile = new File(rootOfFileSystem);
        File[] myFileList = myFile.list();
        for (int i=0;i<myFileList.length;i++){
            if (myFileList[i].isDirecotry){
                create new node 
               // create new leaf 
               // add to node if it has a .java extention
               // Id be inclinded to use substring by "." to figure out if its .java but  thats just me 
            //then add node to root when its on its last iteration ...

    not sure if this will help, but thats my take on it ...sorry i cant post links and the code is pseudo at times, I cant remeber the syntax and I dont have a compiler in front of me .

  3. #3
    zweibieren is offline Senior Member
    Join Date
    Aug 2009
    Pittsburgh, PA
    Rep Power


    The problem lies in
    Java Code:
    return new TreeFile(directory, "NULL");
    This will indeed create a blank line in the visible tree.

    To solve the problem in the TreeModel, both getChild and getChildCount must be implemented.
    getChildCount needs to preprocess directory.list() and count the number of children to be reported.
    That is, count the number of .java and isDirectory children.
    Then getChild(parent, index) needs to scan through directory.list()
    and return the index'th item which is a .java or directory.

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