CODEWITHSUNDEEP
javamodeljtree
Adrian Stamin
Adrian Stamin

Reputation: 697

How do I clear a JTree model?(Removing all nodes)

So this is a method of mine that is called everytime a new node is added.I need the model cleared everytime.The DefaultListModel has a .clear() method.The DefaultTreeModel does not.Help? 

    public void fillUserList(){

    List<User> userFriends = ClientController.getInstance().getPrieteniiUserului(user);

    for(int i=0;i<userFriends.size();i++){
        User user = userFriends.get(i);

        model.insertNodeInto(new DefaultMutableTreeNode(user.getNume()), root, i);

    }

    System.out.println(userFriends);

}

Upvotes: 8

Views: 19048

Answers (3)

Volker Fr&#246;hlich
Volker Fr&#246;hlich

Reputation: 41

public void clearTree(JTree tree) {
        DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
        DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
        root.removeAllChildren();
        model.reload();
    }

Upvotes: 0

drvisor
drvisor

Reputation: 79

If you actually need to delete ALL nodes including root node you should make model null. Like this: 

mytree.setModel(null)

Upvotes: 2

Adrian Stamin
Adrian Stamin

Reputation: 697

I worked it out.The new code looks like this. 

public void fillUserList(){    
    List<User> userFriends = ClientController.getInstance().getPrieteniiUserului(user);
    root.removeAllChildren(); //this removes all nodes
    model.reload(); //this notifies the listeners and changes the GUI
    for(int i=0;i<userFriends.size();i++){
        User user = userFriends.get(i);
        model.insertNodeInto(new DefaultMutableTreeNode(user.getNume()), root, i);        
    }
}

Upvotes: 5

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