Centering Dialog Using JOptionPane.showMessageDialog

Question

To always display the dialogs, I always used code similar to the following:

JOptionPane.showMessageDialog(JOptionPane.getFrameForComponent(this), … yada

However, now I think this is "more correct":

JOptionPane.showMessageDialog(getRootPane(), … yada

What do people prefer / recommend?

Answer 1

None of them are “more correct” - it just depends on what effect you want. From JOptionPane JavaDocs -

parentComponent: , . : , , , . . , , ( L & F).

, - JOptionPane.getFrameForComponent() SwingUtilities.getWindowAncestor() ; getRootPane() RootPaneContainer ( , , JFrame), "this" .

Answer 2

JFrame JDialog, , this :

JOptionPane.showMessageDialog(this, ...);