@SuppressWarnings("null")
public Folder getTreeModel() {
Folder[] deviceTypes = null;
Music[] types = {new Music("IODF"), new Music("IFDT"), new Music("IFAT"), new Music("OBD")};
deviceTypes = new Folder[] {new Folder("告警信息管理", types)};
for (int i = 0; i < deviceTypes.length; i++) {
root.add((Folder) deviceTypes[i]);
}
return root;
}