英文:
Swing wait() and notify() on JDialog, the dialog does not show its components
问题
我有一个鼠标监听器，当我在应用程序窗口中移动鼠标时会被调用。
在MouseEntered方法中，我这样调用了一个ThreadB：
@Override
public synchronized void mouseEntered(MouseEvent e) {
..
ThreadB b = new ThreadB();
b.start();
System.out.println("Before Sync!!!!!!!");
synchronized(b) {
try{
System.out.println("Waiting for b to complete...");
b.wait();
}catch(InterruptedException ex){
ex.printStackTrace();
}
}
System.out.println("After Sync!!!!!!!");
}
class ThreadB extends Thread {
@Override
public void run(){
synchronized(this){
int dialogResult = JOptionPane.showConfirmDialog(null, "加载过程正在进行中。您想要停止该过程吗？", "加载账户", JOptionPane.YES_NO_OPTION);
if (dialogResult == 0) {
System.out.println("选择了是！！！");
}else {
System.out.println("选择了否！！！");
}
System.out.println("before NOTIFY!!!!!!!");
notify();
}
}
}
预期中加载过程已停止，但对话框未被绘制，意味着它未显示其组件。
非常感谢您的帮助。
谢谢
祝好
英文:
I have a mouse listener that gets invoked when I move the mouse in the application window.
In the MouseEntered method, I invoke a ThreadB as such:
@Override
public synchronized void mouseEntered(MouseEvent e) {
..
ThreadB b = new ThreadB();
b.start();
System.out.println("Before Sync!!!!!!!");
synchronized(b) {
try{
System.out.println("Waiting for b to complete...");
b.wait();
}catch(InterruptedException ex){
ex.printStackTrace();
}
}
System.out.println("After Sync!!!!!!!");
}
class ThreadB extends Thread {
@Override
public void run(){
synchronized(this){
int dialogResult = JOptionPane.showConfirmDialog(null, "Loading process is in progress. Do you want to stop the process?", "Loading Accounts", JOptionPane.YES_NO_OPTION);
if (dialogResult == 0) {
System.out.println("Yes is chosen!!!!");
}else {
System.out.println("No is chosen!!!!");
}
System.out.println("before NOTIFY!!!!!!!");
notify();
}
}
}
The loading process is stopped as expected, but the dialog does not gets painted meaning it does not show its components.
Your help is much appreciated.
Thanks a lot
Regards
答案1
得分: 0
你不能在代码的任何位置执行GUI操作，除非该代码在事件分派线程（EDT）中运行。您正在使用自己创建的线程运行它；这是不允许的。请使用例如SwingUtilities.invokeLater或SwingWorker系统。
英文:
You can't do GUI things anywhere in your code, except if that code runs in the Event Dispatch Thread (the EDT). You're running it on a thread of your own creation; not allowed. Use e.g. SwingUtilities.invokeLater, or the SwingWorker system.
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