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Asked: 2026-05-26T23:36:26+00:00

I wrote a file tree using JTree, and now I am trying to make

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I wrote a file tree using JTree, and now I am trying to make it more efficient. I am trying to implement lazy loading, but I can’t for the life of me get the nodes to recognize which file they are in order to expand the next layer. I’ve tried having them check their name against a list of the filenames on their level, and for some reason that doesn’t work. That wouldn’t work anyway in the long run. I have also tried setting the file itself as the node content, but it still won’t recognize it as a file.

I’m sure I’m missing something simple, but I don’t know what it would be. I’ve been searching around, and haven’t found anything. Could anyone help me to figure this out?

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1 Answer

  1. Editorial Team

    DefaultMutableTreeNode allows you to associate an arbitrary “user object”, which in this case could be the File it represents. For example:

    File file = new File("data.txt");
DefaultMutableTreeNode node = new DefaultMutableTreeNode(file);

    Then you simply need to add a TreeSelectionListener to the JTree and interrogate the selected DefaultMutableTreeNode to obtain its File and take appropriate action based on whether it represents a directory or a file.

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