Display file(s) name and select it under the folder in JTree

Question

I managed to come this far using stackoverflow examples, JTree displays all the system drives and folders, wanted to display all the corresponding files fro

Answer 1

Don't add all the file names in a loop. Instead, create a FileTreeModel that implements TreeModel, as shown here. The implementation simply invokes the File method listFiles() in getChild() and getIndexOfChild(). Then you can create a tree and expand any desired row; use setSelectionPath() as shown here.

TreeModel model = new FileTreeModel(new File(System.getProperty("user.dir")));
JTree tree = new JTree(model);
tree.expandRow(0);

I get only the c:\; please give me directions to get all the system drives, etc.

You can get a list of filesystem roots with File.listRoots(), as shown in Find all drive letters in Java, or FileSystemView#getRoots(), as shown in File Browser GUI.