jtree | Tree Notation TypeScript/Javascript library | Dataset library
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kandi X-RAY | jtree Summary
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QUESTION
this is the first time i am using jtree using java. but i couldn't load it when i tried load it it shown as blank.i dont know how to load it.what i tried so far i attached below.please give me the solution for it thanks. JTree name is jTree1
...ANSWER
Answered 2021-May-12 at 07:00You need to add the tree to the root, then add the tree to the JTree:
QUESTION
I have developed GUI tool the displays an XML document as an editable JTree, and the user can select a node in the JTree and attempt to change the actual nodes value in the XML document.
The problem that I'm having is with constructing the correct Xpath query that attempts the actual update.
Here is GUI of the JTree showing which element was selected & should be edited:
Its a very large XMl, so here the collapsed snippet of the XML:
UPDATE (IGNORE ATTEMPT 1 & 2, 1ST ISSUE WAS RESOLVED, GO TO ATTEMPTS 3 & 4)
Attempt 1 # (relevant Java method that attempts to create XPath query to update a nodes value):
...ANSWER
Answered 2021-Feb-17 at 11:20For the test you performed online it seems your XML file contains namespace information.
With that information in mind, probably both of your examples of XPath evaluation would work, or not, dependent on several things.
For example, you probably can use the attempt #4, and the XPath evaluation will be adequate, if you are using a non namespace aware (the default) DocumentBuilderFactory and you o not provide any namespace information in your XPath expression.
But the XPath evaluation in attempt #3 can also be adequate if the inverse conditions apply, i.e., you are using a namespace aware DocumentBuilderFactory:
QUESTION
so when i clicking the Messages tabPane containing the Jtree, this is the preview in my java swing which seems fine.
when i click any of the checkboxes in the JTree it should be either loading(checking) or unloading(unchecking) the messages in the message list with the swingworker running to see the progress. But what happen is after i click the checkboxes (of any condition), yes the swingworker running and giving the loading/unloading progress, but after that, i get this:
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException: Cannot invoke "model.Message.getContents()" because "message" is null
and make the message lists is unclickable, which were clickable before i attempted to click the checkboxes in the JTree.
at the moment i dont need JTree in my purpose for learning swing, so I'm not really taking into account about this JTree lesson, but i need this to be fixed so i can keep go along with the tutorial. that's why i'm not quite sure which code are problematic and needed to put in this thread. So i'm very sorry if my question is not clear. if there still anything i have to put at this thread, please ask me i'll be happy to put it here.
this the class that mentioned in exception
...ANSWER
Answered 2020-Dec-21 at 20:48Your Message class constructor requires two parameters (of: String, String) in order to create an instance of Message. I have no clue what you are currently using to create you Message instances nor do I know what is storing those instances. You do need to keep track of them otherwise you will loose them to JVM Garbage Collection.
I think perhaps you may want to modify your Message Class a little so that you can internally (or externally) store your Message instances and easily access any one of those instances when required, for example:
QUESTION
I have a small GUI application, that processes mouse clicks, and stores them in a list:
...ANSWER
Answered 2020-Nov-06 at 17:23Your problem is in method update() of class TestTree. You keep adding another JScrollPane to the TestTree. You only want one JScrollPane.
You correctly update the model of the JTree and that's all you need to do. The JTree will automatically update itself whenever its model changes.
Also, don't set the size of the JFrame. Set the size of its components and call method pack() which will make the JFrame big enough to contain all its components.
In the below code I have commented out the lines you need to remove from your code.
Class TestTree
QUESTION
So I want to make Tree for File Explorer , But my code is very slow :< I want to increase Perform of this application (sr My English is not very good):
This is What i Want but it's load too slow 1-2min
This is design view
So this is my code : (I remove initcomponent b/c it's not needed)
...ANSWER
Answered 2020-Jul-07 at 14:54but it's load too slow 1-2min
Sounds like you are trying to build the tree for the entire drive up front. Don't.
Instead, you can dynamically build the tree as the user clicks to expand a node by adding a TreeWillExpand listener to the tree.
Simple example:
QUESTION
I have a following xml, with multiple levels( level 1, level 2, level 3). All the level 1 will go into the tab like showed in the picture.
...ANSWER
Answered 2020-May-08 at 06:10public static void main(String[] args) throws ParserConfigurationException, SAXException, IOException {
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
File f = new File("Elements2.xml");
Document d = builder.parse(f);
Node node = d.getDocumentElement();
DefaultMutableTreeNode parent = new DefaultMutableTreeNode();
parent = buildTreeNode(parent, node);
final DefaultMutableTreeNode finalnode = parent;
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI(finalnode);
}
});
}
private static void createAndShowGUI(DefaultMutableTreeNode parent) {
final JFrame frame = new JFrame("Split Pane Example");
// Display the window.
frame.setSize(500, 300);
frame.setVisible(true);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// set grid layout for the frame
frame.getContentPane().setLayout(new GridLayout(1, 1));
JTabbedPane tabbedPane = new JTabbedPane(JTabbedPane.TOP);
tabbedPane.addTab("IRIS", makePanel("IRIS", parent, 0));
tabbedPane.addTab("NAAQS", makePanel("NAAQS", parent, 1));
frame.getContentPane().add(tabbedPane);
}
private static JPanel makePanel(String text, DefaultMutableTreeNode parent, int i) {
JPanel p = new JPanel();
//p.add(new Label(text));
p.setLayout(new GridLayout(1, 1));
JTree jtree = new JTree(parent.getChildAt(i));
JScrollPane sp = new JScrollPane(jtree);
p.add(sp);
return p;
}
private static boolean specialCase = false;
private static DefaultMutableTreeNode buildTreeNode(DefaultMutableTreeNode parent, Node parentNode) {
DefaultMutableTreeNode currentLevel = null;
if (parentNode.getNodeName().equals("treeNode")) {
NodeList children = parentNode.getChildNodes();
for (int i = 0; i < children.getLength(); i++) {
Node node = children.item(i);
if (node.getNodeName().equals("reference") && !node.hasChildNodes()) {
currentLevel = new DefaultMutableTreeNode("root");
specialCase = true;
} else if (node.getNodeName().equals("reference") && node.hasChildNodes()) {
NodeList dataFields = node.getChildNodes();
for (int j = 0; j < dataFields.getLength(); j++) {
Node dataField = dataFields.item(j);
NamedNodeMap attributes = dataField.getAttributes();
if (attributes != null && attributes.item(0).toString().contains("labelFieldValue")) {
String attr = attributes.item(1).toString();
currentLevel = new DefaultMutableTreeNode("@"+attr);
parent.add(currentLevel);
break;
}
}
} else if (node.getNodeName().equals("treeNode") && node.hasChildNodes() && specialCase) {
specialCase = false;
parent = buildTreeNode(currentLevel, node);
} else if (node.getNodeName().equals("treeNode") && node.hasChildNodes() && !specialCase) {
currentLevel = buildTreeNode(currentLevel, node);
}
}
}
return parent;
}
QUESTION
Note: I understand the rules site, but I can't to put all code (complex/large code).
I put a DIFFERENT (all the real code is too much and you don't need here) code in Github but reproduces the Problem (the main class is joseluisbz.mock.support.TestOptimalDSP and switching class is joseluisbz.mock.support.runnable.ProcessorDSP) like the video.
Please don't recommend to me another jar or external library for this code.
I wish I was more specific, but I don't know what part to extract and show. Before you close this question: Obviously, I am willing to refine my question if someone tells me where to look (technical detail).
I made a video in order to show my issue.
Even to formulate the question, I made a diagram to show the situation.
My program has a JTree, showing the relations between Worker.
I have a diagram interaction between threads controlling life with ExecutorService executorService = Executors.newCachedThreadPool(); and List> listFuture = Collections.synchronizedList(new ArrayList<>());
Each Runnable is started in this way listFuture().add(executorService().submit(this)); in its constructor. The lists are created like this: BlockingQueue someBlockingQueue = new LinkedBlockingQueue<>();
My diagram shows who the Worker's father is if he has one.
It also shows, the writing relationships between the BlockingQueue.
RunnableStopper stops related runnables contained in Worker like property.
RunnableDecrementer, RunnableIncrementer, RunnableFilter operates with a cycle that runs each Custom that it receives for its BlockingQueue.
For which they always create a RunnableProcessor (it has no loop, but because of its long processing, once the task is finished it should be collected by the GC).
Internally the RunnableIncrementer has a Map Map> mapListDelayedCustom = new HashMap<>();//Collections.synchronizedMap(new HashMap<>());
When arrives some Custom... I need to obtain the List of lastReceivedCustom List listDelayedCustom = mapListDelayedCustom.putIfAbsent(custom.getCode(), new ArrayList<>());
I'm controlling the Size (is not growing indefinitely).
My code stops working when I add the following lines:
...ANSWER
Answered 2020-Apr-07 at 18:35First, the way you set thread names is wrong. You use this pattern:
QUESTION
I need help in my Java project. How do I populate my JTree dynamically from arrays of String patterned as paths?. Like, String
...ANSWER
Answered 2020-Mar-19 at 06:34Here's a version of treeify() that implements the strategy I was outlining in my comment. It's not the most elegant thing ever, but it gets the job done:
QUESTION
...Need somebody to help. How do I put an array of strings into JTree nested nodes using loop? For example, if I have String names []={"A","B","C","D"}, the JTree result will be D child inside node C, C inside B, and B inside A. Like
- A
- B
- C
- D
ANSWER
Answered 2020-Mar-10 at 14:49public static DefaultMutableTreeNode treeify(List values) {
DefaultMutableTreeNode root = null;
DefaultMutableTreeNode subRoot = null;
for (T value : values) {
if (root == null) {
root = new DefaultMutableTreeNode(value);
} else if (subRoot == null){
subRoot = new DefaultMutableTreeNode(value);
root.add(subRoot);
} else {
DefaultMutableTreeNode child = new DefaultMutableTreeNode(value);
subRoot.add(child);
subRoot = child;
}
}
return root;
}
public static void main(String [] args) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setLocationRelativeTo(null);
JTree tree = new JTree(treeify(Arrays.asList("A", "B", "C", "D", "E")));
frame.add(new JScrollPane(tree));
frame.setSize(150, 300);
frame.setVisible(true);
}
QUESTION
I have a JTree like this:
ANSWER
Answered 2020-Feb-18 at 18:13I want to show only the root "San Francisco" in the screen
After you have created the data and added the model to the tree you can use:
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