怎么让弹出的dialog显示在屏幕中间呢？

Question

Rectangle frameRect = frame.getBounds();
Dimension dialogSize = _dialog.getSize();
dialog.setLocation((frameRect.width-dialogSize.width) / 2 +frameRect.x ,
                        (frameRect.height-dialogSize.height) / 2 +frameRect.y);
dialog.setVisible(true);

Answer 1

javax.swing.JOptionPane.showMessageDialog(this.getGlassPane() ,"msgtxt"  );

Answer 2

供参考：
java.awt.Toolkit.getDefaultToolkit().getScreenSize()getSize()
setLocation()

Answer 3

Dimension screensize=Toolkit.getDefaultToolkit().getScreenSize();
Dimension dialogSize = yourdialog.getSize();
yourdiag.setLocation(screensize.width/2-dialog.width/2,screensize.height/2-dialog.height/2);