[英]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?所以这是我的一种方法,每次添加新节点时都会调用它。我需要每次都清除模型。DefaultListModel 有一个 .clear() 方法。DefaultTreeModel 没有。帮助?
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);
}
I worked it out.The new code looks like this.我解决了。新代码看起来像这样。
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);
}
}
If you actually need to delete ALL nodes including root node you should make model null.如果您确实需要删除包括根节点在内的所有节点,则应使模型为空。 Like this:像这样:
mytree.setModel(null)
public void clearTree(JTree tree) {
DefaultTreeModel model = (DefaultTreeModel) tree.getModel();
DefaultMutableTreeNode root = (DefaultMutableTreeNode) model.getRoot();
root.removeAllChildren();
model.reload();
}
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