java 如何清除 JTree 模型？（删除所有节点）
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How do I clear a JTree model?(Removing all nodes)
提问by Adrian Stamin
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?
所以这是我的一个方法，每次添加新节点时都会调用。我每次都需要清除模型。 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);
}
采纳答案by Adrian Stamin
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);
}
}
回答by drvisor
If you actually need to deleteALL nodes including rootnode you should make model null. Like this:
如果您确实需要删除包括根节点在内的所有节点，则应将模型设为空。像这样：
mytree.setModel(null)
