Java JTree在删除节点后不更新
我试图从JTree中删除节点,我有两个代码 这个代码正在运行Java JTree在删除节点后不更新,java,eclipse,swing,jtree,Java,Eclipse,Swing,Jtree,我试图从JTree中删除节点,我有两个代码 这个代码正在运行 public class test { private JFrame frame; JTree tree; DefaultMutableTreeNode root; DefaultTreeModel model; private Map<String, DefaultMutableTreeNode> treeMap; public static void main(String[] args) { test t
public class test {
private JFrame frame;
JTree tree;
DefaultMutableTreeNode root;
DefaultTreeModel model;
private Map<String, DefaultMutableTreeNode> treeMap;
public static void main(String[] args) {
test t = new test();
//scrolltree is basically a panel contains class has JTree
scrolltree st = new scrolltree();
t.frame.add(st);
JButton b = new JButton("remove node");
t.frame.add(b, BorderLayout.SOUTH);
b.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
DefaultTreeModel model = (DefaultTreeModel) st.getTree().getTree().getModel();
String key = new currentfolder().getCurrentfolder() + "/" + "a3.png";
System.out.println(key);
model.removeNodeFromParent(st.getTree().getTreeMap().get(key));
}
});
t.frame.revalidate();
t.frame.repaint();
}
public test() {
frame = new JFrame();
frame.setVisible(true);
frame.setSize(500, 500);
}
我的类树如下所示
public class tree {
JTree tree;
DefaultMutableTreeNode node1;
DefaultTreeModel model;
String name = new currentfolder().getInitial();// path to directory that its
// content appear in tree
private Map<String, DefaultMutableTreeNode> treeMap;
public tree() {
tree = new JTree();
tree.setExpandsSelectedPaths(true);
node1 = new DefaultMutableTreeNode(name);
model = new DefaultTreeModel(node1);
tree.setModel(model);
treeMap = new HashMap<>();
treeMap.put(name, node1);
//method to inset many other nodes
import_data(new File(name), node1);
model.reload();
tree.setOpaque(false);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setBorder(javax.swing.BorderFactory.createCompoundBorder(
new javax.swing.border.SoftBevelBorder(javax.swing.border.BevelBorder.RAISED),
javax.swing.BorderFactory.createTitledBorder("")));
tree.setVisible(true);
公共类树{
JTree树;
默认可变树节点1;
DefaultTreeModel模型;
String name=new currentfolder().getInitial();//所属目录的路径
//内容显示在树中
私有地图树图;
公树(){
tree=newjtree();
tree.setExpandsSelectedPath(true);
node1=新的DefaultMutableTreeNode(名称);
模型=新的DefaultTreeModel(节点1);
tree.setModel(model);
treeMap=newhashmap();
树映射put(名称、节点1);
//方法插入许多其他节点
导入_数据(新文件(名称),节点1);
model.reload();
tree.set不透明(false);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_tree_SELECTION);
setboorder(javax.swing.BorderFactory.createCompoundBorder(
新建javax.swing.border.SoftBevelOrder(javax.swing.border.BevelOrder.RAISED),
javax.swing.BorderFactory.createTitledBorder(“”);
tree.setVisible(true);
当我做tree t=newtree;
然后把它放在老树上就行了
我怎样才能解决这个问题以及解释为什么它不起作用?谢谢
当我用SwingUtilites.invokeLater()
替换所有这些时,它起了作用。我不明白为什么
正如所建议的,确保仅在上构造和操作Swing GUI对象. 特别是,从另一个线程更新
TreeModel
意味着侦听JTree
视图可能会以某种意外的顺序接收更新,或者根本不接收更新。@trashgod您可以检查这个问题吗?首先,确保只在上构造和操作Swing GUI对象。为了更好地帮助,请尽快发布SSCCE/MCVE,简称,通过使用UIManager中的图标,可以运行、编译model.removeNodeFromParent(startframe.getScrolltree().getTree().getTree().getTreeMap().get(key));无法正常工作(意味着JTree/treemodel中的通知程序……),只需猜测t.frame.revalidate()和t.frame.repaint()的原因;(更多内容由@trashgood在评论中解释)@mKorbel这只是为了在添加新的swing组件后进行更新,是的,我最好使用swing实用程序,谢谢这一点
public class tree {
JTree tree;
DefaultMutableTreeNode node1;
DefaultTreeModel model;
String name = new currentfolder().getInitial();// path to directory that its
// content appear in tree
private Map<String, DefaultMutableTreeNode> treeMap;
public tree() {
tree = new JTree();
tree.setExpandsSelectedPaths(true);
node1 = new DefaultMutableTreeNode(name);
model = new DefaultTreeModel(node1);
tree.setModel(model);
treeMap = new HashMap<>();
treeMap.put(name, node1);
//method to inset many other nodes
import_data(new File(name), node1);
model.reload();
tree.setOpaque(false);
tree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
tree.setBorder(javax.swing.BorderFactory.createCompoundBorder(
new javax.swing.border.SoftBevelBorder(javax.swing.border.BevelBorder.RAISED),
javax.swing.BorderFactory.createTitledBorder("")));
tree.setVisible(true);