有两个可能的问题
从 EDT 调用 JOptionPane，然后屏幕上只显示工具栏（来自 Native OS 的标题，不显示 RootPane）
在那里你可以测试 JOptionPanes 功能，其中 JOptionPane.showInternalMessageDialog() 在所有情况下都会造成麻烦，即存在另一个带有 setModal(true) 的 JDialog，真正的原因我不知道，ModalityTypes 应该也是如此
不能同时在屏幕上显示两个 JOptionPanes
代码
import java.awt.event.MouseEvent;
import javax.swing.JFrame;
import javax.swing.JButton;
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.Toolkit;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.MouseAdapter;
import javax.swing.JDialog;
import javax.swing.JOptionPane;
import javax.swing.JRootPane;
import javax.swing.Timer;
//http://stackoverflow.com/questions/8670297/make-java-swing-modal-dialog-behave-like-mac-osx-dialogs
public class ModalDialogDemoFrame extends JFrame {
private static final long serialVersionUID = 1L;
private ModalDialogDemoFrame modalDialogDemo;
public ModalDialogDemoFrame() {
modalDialogDemo = this;
setBounds(100, 100, 400, 400);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JButton buttonDialog = new JButton("Open Dialog");
buttonDialog.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent arg0) {
// Create a Modal Dialog with this Frame as Parent.
ModalDialog modalDialog = new ModalDialog(modalDialogDemo, true);
modalDialog.setVisible(true);
}
});
getContentPane().add(buttonDialog, BorderLayout.CENTER);
}
public static void main(String[] args) {
EventQueue.invokeLater(new Runnable() {
public void run() {
try {
ModalDialogDemoFrame window = new ModalDialogDemoFrame();
window.setVisible(true);
} catch (Exception e) {
e.printStackTrace();
}
}
});
}
}
//http://stackoverflow.com/questions/4577424/distinguish-between-a-single-click-and-a-double-click-in-java/4577475#4577475
class ClickListener extends MouseAdapter implements ActionListener {
private final static int clickInterval = (Integer) Toolkit.getDefaultToolkit().getDesktopProperty("awt.multiClickInterval");
private MouseEvent lastEvent;
private Timer timer;
public ClickListener() {
this(clickInterval);
}
public ClickListener(int delay) {
timer = new Timer(delay, this);
}
@Override
public void mouseClicked(MouseEvent e) {
if (e.getClickCount() > 2) {
return;
}
lastEvent = e;
if (timer.isRunning()) {
timer.stop();
doubleClick(lastEvent);
} else {
timer.restart();
}
}
@Override
public void actionPerformed(ActionEvent e) {
timer.stop();
singleClick(lastEvent);
}
public void singleClick(MouseEvent e) {
}
public void doubleClick(MouseEvent e) {
}
}
class ModalDialog extends JDialog {
private static final long serialVersionUID = 1L;
public ModalDialog(JFrame parent, boolean modal) {
Dimension dimensionParentFrame = parent.getSize();
setSize(new Dimension((parent == null) ? 300 : dimensionParentFrame.width / 2, 75));
Dimension dimensionDialog = getSize();
int x = parent.getX() + ((dimensionParentFrame.width - dimensionDialog.width) / 2);
setLocation(x, parent.getY() + parent.getInsets().top);
//setUndecorated(true);
setModal(modal);
//setUndecorated(true);
//getRootPane().setWindowDecorationStyle(JRootPane.ERROR_DIALOG);
setModalityType(ModalityType.APPLICATION_MODAL);
setDefaultCloseOperation(DISPOSE_ON_CLOSE);
final JButton buttonClose = new JButton("Close");
buttonClose.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
//ok
/*JOptionPane.showMessageDialog(buttonClose,
"Eggs are not supposed to be green.",
"Inane warning",
JOptionPane.WARNING_MESSAGE);*/
//uncomment for un_handled GUI, JOptionPane is behing JFrame I think....
/*JOptionPane.showInternalMessageDialog(buttonClose,
"Eggs are not supposed to be green.",
"Inane warning",
JOptionPane.WARNING_MESSAGE);*/
//ok
/*JOptionPane.showConfirmDialog(buttonClose,
"Eggs are not supposed to be green.",
"Inane warning",
JOptionPane.WARNING_MESSAGE);*/
//ok
/*JOptionPane.showMessageDialog(null,
"Eggs are not supposed to be green.",
"Inane warning",
JOptionPane.WARNING_MESSAGE);*/
//uncomment for un_handled GUI
//Exception occurred during event dispatching:
//java.lang.RuntimeException: JOptionPane: parentComponent does not have a valid parent
/*JOptionPane.showInternalMessageDialog(null,
"Eggs are not supposed to be green.",
"Inane warning",
JOptionPane.WARNING_MESSAGE);*/
//ok
JOptionPane.showConfirmDialog(null,
"Eggs are not supposed to be green.",
"Inane warning",
JOptionPane.WARNING_MESSAGE);
dispose();
}
});
add(buttonClose, BorderLayout.CENTER); // comment for listening
addMouseListener(new ClickListener() {
@Override
public void singleClick(MouseEvent e) {
System.out.println("single");
}
@Override
public void doubleClick(MouseEvent e) {
System.out.println("double");
}
});
}
}