jtree

问题 Get List<List<CustomObject>> from JTree I was populating the JTree according to this question... Recursively populate JTree, using list of list using the Answer https://stackoverflow.com/a/56090968/7339033 List<List<Pair>> listOfListPair = new ArrayList<>(); listOfListPair.add((List<Pair>) Arrays.asList( new Pair[]{new Pair(1, 1), new Pair(3, 1), new Pair(1, 2)})); listOfListPair.add((List<Pair>) Arrays.asList( new Pair[]{new Pair(1, 1), new Pair(3, 1), new Pair(3, 1)})); listOfListPair.add(

问题 I am wondering how to make the following code in replacing the JTree component working. Currently I am getting a java.lang.NullPointerException at RandomJTree$1.keyPressed(RandomJTree.java:64) at java.awt.Component.processKeyEvent(Component.java:6221) at javax.swing.JComponent.processKeyEvent(JComponent.java:2801) at java.awt.Component.processEvent(Component.java:6040) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4630) at java

问题 I try to make JTree with custom TreeRenderer public class TextCellRender implements TreeCellRenderer { JPanel panel; JTextArea text; JLabel label; LayoutManager Layout; public TextCellRender() { text = new JTextArea(); text.setWrapStyleWord(true); text.setLineWrap(true); text.setSize(360, text.getPreferredSize().height); label = new JLabel(); panel = new JPanel(); panel.add(label); panel.add(text); } @Override public Component getTreeCellRendererComponent(JTree tree, Object value, boolean

问题 Do i really have to implement the deep-clone myself or are there any library methods to get a deep clone of an JTree or it's TreeModel? 回答1: As said by @SteveKuo, why do you need to clone a TreeModel ? TreeModel can be shared amongst different instances of JTree . Here is a sample demo of two JTree's sharing the same model. Alternatively, you could create twice the same TreeModel : import java.awt.BorderLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import

问题 I'm a new Java Swing programer, I've got java basic. I want to create a form include jtree, jtree can be resized horizontal by mouse when application is running. How can I do that? Thanks for your help! 来源： https://stackoverflow.com/questions/19854885/how-to-resize-horizontal-jtree-java-swing-by-mouse-when-application-is-running

问题 Just trying to work out what happens, in terms of threads, if you change the user object of a DefaultMutableTreeNode in a non-EDT thread? I'm not talking about the DefaultTreeModel events, namely insertNodeInto and removeNodeFromParent, which I'm pretty clear should always be run in the EDT... I think... In the case of changes to nodes' user objects, it appears that JTree.TreeModelHandler is the thing which is "listening" for such events... but is there reason to expect that the listener will

问题 Is there an ability to select multiple tree nodes in JTree programmatically? I've set multiselection mode by tree.getSelectionModel().setSelectionMode(TreeSelectionModel.DISCONTIGUOUS_TREE_SELECTION); And all I need - make my application be able to select some nodes programmatically. But I've didn't found the way how to do that. Could anybody give advice how to solve this? Thanks 回答1: import java.awt.Dimension; import javax.swing.*; import javax.swing.event.*; import javax.swing.tree.*;

问题 I want to use a custom TreeCellRenderer containing three text fields only when a node is SELECTED, while use the default renderer when the node is NOT SELECTED. The problem is that although I've set an appropriate preferred and minimum size for the panel, JTree does not update the edited row height. On the contrary when I use the same panel as an editor, it is rendered correctly. Can someone explain why this is happening? Is there a recommended way to achieve a rendering resizing behavior

问题 I am testing some code with JTree , and I noticed that model.reload() gives different output than model.nodeChanged(currentNode) . The correct output is obtained from model.reload() . Here are my two outputs for the same code: My code is as follows: 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(); try { Thread.sleep(1000 *

问题 I write some program for monitoring processes on unix server. The main part of my code is looking like this: Class FeedMonitor { //............. private volatile boolean monitor = true; private volatile String feedShRez; private volatile DefaultMutableTreeNode envNode; //............. public void prepareGUI() { //.............. // SwingWorker worker = new SwingWorker<Void, Void>() { @Override protected Void doInBackground() throws Exception { sh = new Shell(env); System.out.println("Swing