JDialog : Java Glossary

JDialog

JDialogs are a type of Window that pop up over a parent JFrame, usually to ask the user to confirm something or display an About box. JDialogs can be modal or non-modal. Modal JDialogs monopolise the user’s attention, preventing him from clicking anywhere but in the jdialog box.

For simple questions, you can use JOptionPane.showInputDialog which comes in two versions, one that just prompts for a String and one that selects an item from a list.

Dialog is the AWT equivalent of JDialog.

Gotchas	Learning More
Sample Code	Links

Gotchas

JDialog constructors want a Frame/JFrame as parent. Unfortunately, JApplet is an Applet, which is a Panel, not a Frame. To embed a JDialog in an Applet, you must chase the Component.getParent chain until you find an instanceof Frame. Alternatively, you can pop up a new JFrame for the JDialog to live in.

If JDialogs fail to paint anything, it could be because you forgot to do a setSize, validate(), or setVisible( true ). JDialog.setBackground does not work. Use jdialog.getContentPane().add( child );

Sample Code

Learning More

Sun’s Javadoc on JDialog class : available:

on the web at java.sun.com
in the current JDK 1.6.0_18 or in the old JDK 1.5.0_22 on your local Windows J: drive.

AWT
decorated
Dialog
gotchas
JOptionPane
pane
Swing
window differences

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