Display tree in JTree

Question

Hi, I would like to ask you how can I display my Tree? in JTree?
I create tree:
Folder fol = new Folder(folderName, numFiles);
DefaultMutableTreeNode treeNode = new DefaultMutableTreeNode(fol);
....But now I does not know how to display tree with folder names. When I use tree.setModel(...); it display object, but not folder names...
And how can I use red font color for folder names with 0 files(numFiles = 0)?

Answer 1

Hi, I would like to ask you how can I display my
Tree? in JTree?
I create tree:
Folder fol = new Folder(folderName, numFiles);
DefaultMutableTreeNode treeNode = new
DefaultMutableTreeNode(fol);
....But now I does not know how to display tree with
folder names. When I use tree.setModel(...); it
display object, but not folder names...you need to walk through your tree and create a new DefaultMutableTreeNode for each of your nodes and add to its parent node of your JTree (remember there is a distinction between view and control). the user object of your DefaultMutable TreeNodes is the file/folder, which should be in its own class (see below) and overwrite toString() to return the name. then the JTree will show what you want.
>
And how can I use red font color for folder names
with 0 files(numFiles = 0)?you need a tree cell renderer. it gets your file/folder object (see above) as a parameter. you can query it about the number of files and set the foreground/background accordingly.
thomas