Swing/AWT/SWT :: Possible To Stop And Start A Listener Alternatively In Java Frames?
Dec 3, 2014
I was developed a simple GUI, in that it requires modification of jtextfield content while JComboBox item selected and vice-versa. I was used itemListener on JComboBox and Document Listener on JTextField. It was gives exception while running the code. Because one listener source effected by another one..
Exceptions are like this:
Exception in thread "AWT-EventQueue-0" java.lang.IllegalStateException: Attempt to mutate in notification
at javax.swing.text.AbstractDocument.writeLock(Unknown Source)
at javax.swing.text.AbstractDocument.replace(Unknown Source)
at javax.swing.text.JTextComponent.setText(Unknown Source)
at ronanki.swing.pcahostsimUI$5.itemStateChanged(pcahostsimUI.java:368)
at javax.swing.JComboBox.fireItemStateChanged(Unknown Source)
[Code] ......
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Jan 7, 2015
I'm developing Chat application GUI using SWING. My GUI has two JtestAreas one for displaying message that i was sent, and another for displaying replay coming from server. I was used Thread.sleep(1000) after message sent . Due to that, AWT-EventQueue-0 thread stops to display send message in first JtextArea and waits until it get response from server. After got response from server, in one shot, My GUI displays both JtetAreas Content.
But, I need to display send Message and Response Message in two different shots. I know the reason why it displays in one shot.
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Oct 16, 2014
I am new to making an installer so far i have made only one and i used "install creator"
I just make a watch (clock) application and i want when the windows start its also starts automatically except if it is closed by the user
just like widows clock widget.
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Feb 7, 2014
I have a swing application that gets football scores from a website using Jsoup.
When the "Get Scores" button is pressed, the scores are printed to a JTextArea with a JScrollPane.
I have also used a SwingWorker to update the scores every couple of seconds.
My problem is that every time the JTextArea updates, the JScrollPane scrolls back to the top of the text area. I wan the scroll bar to stay where the user left it.
Here is my code (The update is currently set to update every 1 second so you can see what the scroll bar is like).
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.select.Elements;
public class frame extends JFrame {
[Code] ....
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May 27, 2014
I've been doing a course with a heavy focus on applets and AWT using BlueJ. I've branched out and learn to convert my applets to applications. I can successfully use frames to do similar things to applets (in BlueJ's applet viewer) but I can not seem to run more than application at a time (unlike applets where I could run several at the same time).
Below is a simple Hello World program I wrote. When I re-run main() it closes the original and starts again. (I'm aiming to explore the java.net.* libraries and for testing would like to use more than one frame at a time which can communicate to each over via sockets).
import java.awt.*;
import java.awt.event.*;
public class HelloWorld extends Frame implements WindowListener {
public static void main (String[] args) {
HelloWorld app = new HelloWorld();
app.setSize(500,500);
[code]....
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Jan 13, 2014
I developed a simple java gui . On running a frame opens with 5 buttons and each button opens another frame when selected. There are no errors and frames open and close as required however i see that only the main program frame has the icon and title that i assigned and the frames bieng called through the buttons have the default frame with java icon and no title although it's been specified in the code of these called frames. When these called frames are executed individually though the program the title and icon are displayed.
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May 18, 2014
I made a check4 application with Java.It correctly works but sometimes the application just stop itself during the execution.I never had a problem like this. The application just stop itself and i can't even quit using the closing button..
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May 25, 2014
I have a Jbutton in my application named as SUBMIT,on clicking SUBMIT the text of jButton changes to ABORT. I wish to apply enter key listener on both the SUBMIT and ABORT button in my applcation, however I am not able to get the text of the button in key listener,so that i can apply my code based on the current text of Button.
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Feb 22, 2014
I'm using Eclipse with the Window Builder Pro plugin to create a Java program. I noticed that when I had Eclipse create an action listener for a combobox in a Swing GUI it created an AWT listener.
Did I choose the wrong type of listener? I want my code to use the Swing components because I understand that they are more portable.
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Jun 26, 2014
I have two different classes called Login (in the package View) and RegButtonListener (in the package Controller). I want to use the MVC pattern.
Login creates a GUI for login. I used NetBeans GUI Builder to create it.
In the class RegButtonListener there is the code for the click of the buttons, then various listeners of the GUI.
Now I want to close the login frame at the click of a button so I want to use the dispose() method.
If I had all the code (GUI code and code of the listener) in the same file, close the frame would be easy enough to do because this.dispose(). But in my case I have two different classes.
I also have a second problem.
In Login class (in the packege View) I have included the line :
regButton.addActionListener(Controller.RegButtonListener).
However, Netbeans tells me an error "package regButton does not exist. <identifier> expected". Why does he consider regButton a package? How can I fix these two problems?
How do I do then?
Below is the code of the two classes.
Login class.
public class Login extends javax.swing.JFrame {
/** Creates new form Login */
public Login() {
initComponents();
[code]....
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Feb 19, 2014
In the book we made a GUI which has 2 buttons, a label and a panel (the panel is a subclass of JPanel). What the program does is the following: When I press one of the two buttons, in the panel there is a rectangle that changes its color. When I press the other button it has to change the text on the label. Now the problem is that when I start the program, the FIRST time I press the button on which the label must change, this also changes the color in the rectangle, which it should not (I also noticed that when i FIRST click the rectangle shifts a little bit to the left). After that the program works fine.
Here is my code:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class TwoButtons{
JFrame fr;
JButton labelButton;
JButton colorButton;
JLabel label;
[Code] ....
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Jul 14, 2014
I have three JComboBoxes. When the user selects an entry in the first JComboBox the entries in the second are set. For this I use an Action extends AbstractAction which is bound to the first JComboBox.
I have also bound an Action to the second JComboBox.
Problem: this also fires when the entries on the second JCombox are added which leads to a Nullpointer.
I need a Listener which only reacts to user input, and does not react when the model of the JComboBox is changed.
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Sep 22, 2014
I’m teaching myself Java. I am a fairly proficient programmer in other languages, but this is the first OO language I’m doing.I have a question that is a bit hard to summarize. Or it should be: how can I pass on an object (or variable) to an event listener?
I am writing an application in which you can play a Sudoku game. I have separated the “logic” or the “model”(the classes with Sudoku data structures and methods to manipulate them) from the presentation (the view and the controller).The main method starts off as follows:
SudokuModel model = new SudokuModel();
SudokuView viewController = new SudokuViewController(model);
The first line creates class for the logic and the second line creates the class for the view and the controller. Since the view and the controller need access to the business logic, the model is passed on to the ViewController class.The SudokuViewController class creates the user interface in Swing and it handles the user input. For the user input I have created a number of listeners, like this:
table.addKeyListener(this);
Now these listeners need access to the model since they update it. However, as far as I’m aware the only parameter passed on to an event listener is the event itself. So these event listeners do not have direct access to the model, even though it is passed on to the constructor of the class SudokuViewController.
To circumvent this, I made model2 an attribute (variable) of the class SudokuViewController. The constructor of the class sets this variable as follows:
model2 = model;
Now the event listeners have access to model2, which they can manipulate.This works. However, I think it is an ugly solution, introducing an additional object (model2). I’d like to pass on the object named model to the event listener, but this doesn’t seem to be possible.
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Jun 2, 2014
JMenuItem blueChoice = new JMenuItem("Blue");
blueChoice.addActionListener(new InnerMenuListener(){
public void actionPerformed(ActionEvent e){
String buttonCommandString = e.getActionCommand( );
if (buttonCommandString.equals("Red"))
redPanel.setBackground(Color.RED);
else if (buttonCommandString.equals("White"))
whitePanel.setBackground(Color.WHITE);
else if (buttonCommandString.equals("Blue"))
bluePanel.setBackground(Color.BLUE);
else
System.out.println("Unexpected error.");
}
});
Can a method in an anonymous inner class ever be private? why or why not?
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May 26, 2014
I have a Stream instace which produces values using an infinite Supplier (it supplies values taken from an electronic sensor -- so unless the battery is low, the sensor will provide "for ever").
The stream is processed by a Collector using Stream.collect() (e. g. imagine that the values from the sensor should be averaged; in fact what it does is a bit more compliacted maths).
The problem is that the collector does not produce a result but hangs up, as the supplier does never stop providing more sensor values.
So what I need is a limitation rule that stops the stream. While there is a Stream.limit(long) method, it actually does not solve my problem as in my case it is not practical to stop after a particular count, while I actually want to stop streaming when the sensor value exceeds a particular limit etc. (hence, voids an arbitrary rule).
To sum up, what I need is Stream.limit(Predicate), i. e. the stream will stopped once the predicate becomes true.
Unfortunately I did not find anything like that in JRE 8.
Is that planned for JRE 8.1 or JRE 9.0? Or is there a known (and sophisticated) workaround?
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Feb 22, 2015
I have buttons created on a frame and then I register the listener from a controller in a controller-view relationship.
When I click the button on the face, the action never executes for some reason. I thought maybe there was a problem registering the listener but I can call the buttons doclick() method and it executes as it should. Perhaps I'm overlooking something really obvious here but I can't see it.
btnEight = new JButton( "8" );
// btnEight.addActionListener( controller );
btnEight.setBounds( 212, 90, 41, 23 );
frame.getContentPane().add( btnEight );
and then I add the listener
public void setController( ActionListener theController ) {
Component[] components = frame.getContentPane().getComponents();
for ( Component component : components ) {
if ( component instanceof JButton ) {
JButton button = ( JButton ) component;
button.addActionListener( theController );
}
}
again, when i click the button nothing happens. but if i add the following code
btnEight.doclick()
the actionPerformed invokes in theController as I intended.
You can see the entire project on GitHub so you can see the full context. The controller class contains the listener and the view class contains the buttons.
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Nov 11, 2014
I need to take the value of what's typed in my JTextField, and once the submit button is clicked, I want to add that string to my JComboBox list items.
Depending which RadioButton they selected, I need to put the team in HOME or AWAY teams, and so on and so on, until they continue clicking submit.
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Jan 25, 2007
I need to change the value only when I press one of the arrows in a JSpinner component.How can I add a listener to the arrow buttons. I tried ChangeListener but it was not what I needed
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Jun 3, 2014
Is there some equivalent of the Swing TreeWillExpand-listener for TreeView?
In my particular case I want to check whether some constrains are set to show some children before they will populated in the view.
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Apr 13, 2014
I am trying to create a timer.
Timer timer = new Timer(1000, new TimerActionListener());// does this mean the speed?
int count = 180;
I would like the timer to start to be set to 1 minute and the timer to go backwards so 60,59,58,57 etc..
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Jan 30, 2015
I have the following listener on a tableset of names:
ListSelectionListener singleListener=new ListSelectionListener() {
public void valueChanged(ListSelectionEvent e) {
int row=e.getFirstIndex();
if (row==previousRow) {
row=-1;
[Code] .....
The println shows that getValueIsAdjusting is called 4 times when I click a single selection from the list. Is this normal behavior? If so how do I determine which call to really use. If not, where can I look to see why it is being called 4 times on a single click?
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Jul 22, 2014
In my card game applet I have to play some music and the user must have the ability to play, stop and pause the song using buttons. I got the play and stop to work easy but I'm unable to add the pause option/method.
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Nov 13, 2014
I have a question about Frames per second in games. In a simple game i should be able to pull off 60(exactly), right? So if i have this code for a game loop:
while(shouldRun){
Thread.sleep(1000/60);
//loop code here
}
will that run at 60 fps?
The loop code takes a tiny bit of time, then it waits for (a second/60), so overall the code will be running overall since the code takes some time?
Is this the case , and if so is there a solution?
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Apr 3, 2014
i want to know how i can add more than one frame in a single frame means main window or frame will be constant and only components will be chang or vary as in a software or game .
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Nov 15, 2014
I made a tiny app that saves notes to a folder within the classes directory where I created the .jar file.Let's say I wanted to add this to Java Web Start. Would I be able to transfer the jar file within a folder(s) or would I have to change the program so that It creates a new folder to save texts In automatically ? Basically , can jar files be transferred with other files/folders ?
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Oct 20, 2014
I am working on this experiment code, I keep getting an exception:
run:
Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: -256
at .MemoryManager.read(MemoryManager.java:68)
at .MemoryProcess.callMemory(MemoryProcess.java:39)
at .main(Lab3.java:29)
Picked up JAVA_TOOL_OPTIONS: -Dfile.encoding=UTF8
Java Result: 1
BUILD SUCCESSFUL (total time: 0 seconds)
The offending line is data=RAM[physicalAddress]; inside MemoryManager.java.
why this is exactly happening and thus correct my piece of code.
The code:
main.java
package experiment;
public class Main{
/**
* @param args the command line arguments
[Code].....
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