awt-eventqueue

Can anyone help me identify the Exception in thread “AWT-EventQueue-0” java.lang.NullPointerException on Line 65?

由 空扰寡人 提交于 2019-12-31 07:15:13
问题 I keep getting a Run Time error that says I am having an Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException it is saying a [line 65] but to me it just looks like a basic if statement. I can give some background. this frame is call from a sequence of frames that is then once the state is selected sent to a new frame that contains states A-C cities. This current frame will work only when Alabama is not the state selected. (I have not created the other frames for the other

How to replace or restart a deadlocked Swing EventDispatchThread/EventQueue in Java 8 desktop application

由 只愿长相守 提交于 2019-12-24 14:13:21
问题 A while back we added some code to our application to detect and attempt to recover from a Swing EDT deadlock, so the user could at least save their files (it would be best to not have a deadlock, but...). In Java 1.6, this is easy. Detect that the EDT has been blocked for a sufficient amount of time, and then call this from a background thread: EventQueue newQ = new EventQueue(); Toolkit.getDefaultToolkit().getSystemEventQueue().push(newQ); New UI events will be processed on a new EventQueue

AWT-EventQueue-0 Exception when openning JFrame

由 岁酱吖の 提交于 2019-12-14 03:34:49
问题 I have two class: public class RecordTableGUI2 extends JFrame implements ActionListener { private JButton addButton; JTable table; RecordTableModel2 model2; public RecordTableGUI2() { model2 = new RecordTableModel2(); table = new JTable(model2); ... add(buttonPanel(), BorderLayout.SOUTH); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); setSize(700, 550); setLocation(300, 80); setVisible(true); } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == addButton) { this

Could someone explain what purpose EventQueue object serves?

由 雨燕双飞 提交于 2019-12-12 03:04:24
问题 Could someone explain what purpose EventQueue object serves in Java Swing? I'm mostly confused about how queuing events is applied. Maybe providing common use of an event queue would be helpful. 回答1: Because Swing is single threaded, it uses the EventQueue to hold instances of Runnable so that they can be dispatched sequentially and in the order posted , whether generated by the system or your program. The sine qua non usage is posting an event via EventQueue.invokeLater() , which ensures

Can't filter MouseEvent.MOUSE_CLICKED in AWT EventQueue

由 无人久伴 提交于 2019-12-11 20:12:09
问题 I need in my own AWT EventQueue filtering mouse double clicks, so I do: public class AppEventQueue extends EventQueue { @Override protected void dispatchEvent(AWTEvent event) { super.dispatchEvent(event); if(event instanceof MouseEvent) { MouseEvent mouseEvent = (MouseEvent) event; if(mouseEvent.getModifiers() == MouseEvent.MOUSE_CLICKED) { //do something } } } } Problem I have is that it looks that click with mouse is generating int value 16, MouseEvent.MOUSE_CLICKED has value 500. Am I

On Event Dispatch Thread---want to get off of it

由 别来无恙 提交于 2019-12-07 16:32:41
问题 Suppose that a method I own is sometimes called on the Event Dispatch Thread and is sometimes not. Now suppose some of the code in that method I want to have called on a thread other than the Event Dispatch Thread. Is there a way to run some code on a thread other than the EDT at this point? I tried this: if (SwingUtilities.isEventDispatchThread()) { new Runnable() { @Override public void run() { myMethod(); } }.run(); } else { myMethod(); } But myMethod() ended up running on the EDT even

Can anyone help me identify the Exception in thread “AWT-EventQueue-0” java.lang.NullPointerException on Line 65?

由 回眸只為那壹抹淺笑 提交于 2019-12-02 10:43:14
I keep getting a Run Time error that says I am having an Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException it is saying a [line 65] but to me it just looks like a basic if statement. I can give some background. this frame is call from a sequence of frames that is then once the state is selected sent to a new frame that contains states A-C cities. This current frame will work only when Alabama is not the state selected. (I have not created the other frames for the other states hence why they are commented out) I can put up the code to the other frame it is supposed to call

How to implement idle task in Java Swing

由 生来就可爱ヽ(ⅴ＜●) 提交于 2019-12-02 02:42:17
I have a GUI app that is getting to be quite slow. I want to start introducing timing for various GUI tasks - however, many of our GUI actions trigger other actions which then "invoke later" to trigger other actions. Eventually, it all settles down and there's nothing more to do. At this time, I want to stop a timer and report how long that GUI "action" took. I figured the way to do this is to implement a method called invokeOnceIdle(Runnable task) . The method will execute the supplied task only once the AWTEventQueue is "empty". i.e. the supplied "task" should be the last thing in the queue.

How to implement idle task in Java Swing

由 不问归期 提交于 2019-12-02 02:10:41
问题 I have a GUI app that is getting to be quite slow. I want to start introducing timing for various GUI tasks - however, many of our GUI actions trigger other actions which then "invoke later" to trigger other actions. Eventually, it all settles down and there's nothing more to do. At this time, I want to stop a timer and report how long that GUI "action" took. I figured the way to do this is to implement a method called invokeOnceIdle(Runnable task) . The method will execute the supplied task

Exception in thread “AWT-EventQueue-0” java.lang.NullPointerException Error

由 Deadly 提交于 2019-11-27 20:51:59
Hello I'm a new programmer at an high school level as a result I do not know much about programming and am getting quite a few errors which have been resolved while others I completely do not understand. I am to make a simple Check Box selection program where the user gets to pick between a variety of choices and depending on their action the image changes. The program itself compiles perfectly but when I run it however it gives me some complications. Here is my program: package components; import java.awt.*; import java.awt.event.*; import javax.swing.*; public class Workshop extends JPanel
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