Question

JTree constructor

Asked by: anloleo

I want to create a JTree using its default constructor JTree myTree=new JTree(), and only in a second time ( not during initialization of the parent JFrame) populate myTree using a "root" DefaultMutableTreeNode. But there's no method in JTree class that accepts as parameter a TreeNode object! How can I do it? I'm start to study Java in the last month and probably my question is very trivial....
Thanks

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Asked On
2000-10-16 at 09:03:11ID11566579
Topic

Java Programming Language

Participating Experts
4
Points
15
Comments
4

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Answers

 

by: david_dPosted on 2000-10-16 at 09:40:10ID: 4754567

Hi,

The best thing to do would be:

DefaultMutableTreeNode dMTN = new DefaultMutableTreeNode();

JTree tree = new JTree(dMTN);

dMTN = new DefaultMutableTreeNode(Object);

This places a new object into the root defaultMutableTreeNode.

The first line of code makes the JTree have no text next to the folder or file icon.

Cheers

David

 

by: jimmackPosted on 2000-10-17 at 01:36:37ID: 4765200

Hi anloleo,

  Although david_d is right, I understand that you want to set the root in a pre-existing JTree.

  You are also right, JTree itself has no method to do this.  That is because JTree is not where the data is stored.  This is in the TreeModel.  TreeModel is just an "interface", so it contains no implementation.  Since you are using defaults, you should actually have a "DefaultTreeModel" within your JTree.

  You can get this using:

    DefaultTreeModel theModel = (DefaultTreeModel)myTree.getModel();

  If you have:

    DefaultMutableTreeNode theRootNode;

  you can then do:

    theModel.setRoot(theRootNode);

  Thanx.

  Jim.

 

by: girionisPosted on 2003-04-18 at 11:57:00ID: 8355571

No comment has been added lately, so it's time to clean up this TA.

I will leave a recommendation in the Cleanup topic area that this question is:

- points to david_d

Please leave any comments here within the
next seven days.

PLEASE DO NOT ACCEPT THIS COMMENT AS AN ANSWER !

girionis
Cleanup Volunteer

 

by: moduloPosted on 2003-04-26 at 13:22:53ID: 8402291

Finalized as proposed

modulo

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