我一直在这里搜索并找到了这个问题的答案,但似乎无法使它们适合我。基本上我有一个包含JScrollPane中的JTree的GUI:
private void initComponents() {
scroll = new javax.swing.JScrollPane();
nodo padre = new nodo();
modeloArbol modelo = new modeloArbol(padre);
arbol = new arbolNodos(modelo);
我有以下课程:
public class arbolNodos extends JTree implements Serializable{
public arbolNodos(TreeModel newModel) {
public class listenerModeloArbol implements TreeModelListener{
//Overriding treeNodes*(TreeModelEvent e)
public class modeloArbol extends DefaultTreeModel implements Serializable{
public modeloArbol(TreeNode root) {
super(root);
}
public class nodo extends DefaultMutableTreeNode implements Serializable{
我还有2个按钮存储(botonGuardarArbol)并使用XMLEncoder检索(botonCargarArbol)JTree(它们真正检索树的根节点)到具有相应actionPerformed监听器的文件中:
private void botonGuardarArbolActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
try {
XMLEncoder encoder = new XMLEncoder(new BufferedOutputStream(new FileOutputStream("C:\\borrar\\presupuesto")));
encoder.writeObject(arbol.getModel().getRoot());
encoder.close();
private void botonCargarArbolActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
try {
XMLDecoder decoder = new XMLDecoder( new BufferedInputStream(new FileInputStream("C:\\borrar\\presupuesto")));
nodo padre = (nodo) decoder.readObject();
modeloArbol modelo = new modeloArbol(padre);
decoder.close();
modelo.setRoot(padre);
arbolNodos arbolNuevo = null;
if( modelo != null ){
arbolNuevo = new arbolNodos(modelo);
arbol = null;
arbol = arbolNuevo;
((DefaultTreeModel)arbol.getModel()).reload();
}
else
arbolNuevo = new arbolNodos();
问题是,当我检索存储的JTree时,我知道它已被很好地检索,因为我尝试在树的所有节点内打印属性并且它们没问题,但是当我尝试将它放在Swing中它没有&# 39; t refresh和视图bloks(即我无法在加载之前操作JTree中的任何内容)。我已经尝试了刷新/更新JTree的众多线程,但无法修复它。我怎么能这样做?
谢谢
答案 0 :(得分:4)
if( modelo != null )
{
arbolNuevo = new arbolNodos(modelo); //
arbol = null;
arbol = arbolNuevo;
((DefaultTreeModel)arbol.getModel()).reload();
}
else
arbolNuevo = new arbolNodos();
不要继续创建新的JTree对象。如果您想更改模型,请使用:
tree.setModel(...);
另外,为什么要扩展JTree,DefaultTreeModel,DefaultMutableTreeNode?如果由于某种原因,您确实需要扩展这些类,那么请遵循这些类的标准Java命名约定。类以大写字符开头。