The JOptionPane Message Argument is an Object, not a String. : JOptionPane Dialog « Swing « Java Tutorial






  1. If the message is an array of objects (Object[ ]), make the JOptionPane place each entry onto a separate row.
  2. If the message is a Component, place the component in the message area.
  3. If the message is an Icon, place the Icon within a JLabel and display the label in the message area.
  4. If the message is an Object, convert it to a String with toString(), place the String in a JLabel, and display the label in the message area.
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JOptionPane;

public class Test2 extends JFrame {
  public Test2() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

    getContentPane().add(new JLabel("Placeholder label"));
    pack();
    setSize(200, 200);
    setVisible(true);

    Object msg[] = { "Complex Message", new JButton("A component"),
        new Object[] { "  Nested", "  Array" }, "for JOptionPane" };
    Object type[] = { "Animal", "Vegetable", "Mineral" };
    int result = JOptionPane.showOptionDialog(this, msg, "Choose",
        JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE, null, type,
        null);

    System.out.println("Result (index)= " + result + " (" + type[result] + ")");
  }

  public static void main(String[] args) {
    new Test2();
  }
}








14.56.JOptionPane Dialog
14.56.1.Creating a JOptionPane
14.56.2.The JOptionPane Message Argument is an Object, not a String.
14.56.3.The JOptionPane Message Type and Icon Arguments
14.56.4.The JOptionPane Option Type Argument
14.56.5.The JOptionPane Options and Initial Value Arguments
14.56.6.JOptionPane Option Position Constants
14.56.7.Using JOptionPane to Display a Message
14.56.8.Using JOptionPane to Prompt User Confirmation
14.56.9.Using JOptionPane to prompt user confirmation: a demoUsing JOptionPane to prompt user confirmation: a demo
14.56.10.Using JOptionPane to Obtain User Input
14.56.11.Using JOptionPane with a predefined selectionsUsing JOptionPane with a predefined selections
14.56.12.Display JOptionPane
14.56.13.JOptionPane Utility Class: Get selection from JOptionPaneJOptionPane Utility Class: Get selection from JOptionPane
14.56.14.Message Pop-UpsMessage Pop-Ups
14.56.15.Confirm Pop-UpsConfirm Pop-Ups
14.56.16.Input Pop-UpsInput Pop-Ups
14.56.17.Big value list for JOptionInput DialogBig value list for JOptionInput Dialog
14.56.18.Option Pop-UpsOption Pop-Ups
14.56.19.String Array Option PopupsString Array Option Popups
14.56.20.Complex message argumentsComplex message arguments
14.56.21.Adding Components to the Button Area: Using JOptionPane with a JButton containing a text label and an iconAdding Components to the Button Area: Using JOptionPane with a JButton containing a text label and an icon
14.56.22.Sample JOptionPane in a JDialogSample JOptionPane in a JDialog
14.56.23.Instant Input DialogsInstant Input Dialogs
14.56.24.JOptionPane WARNING_MESSAGEJOptionPane WARNING_MESSAGE
14.56.25.Dialog without parent componentDialog without parent component
14.56.26.To displays a dialog with a list of choices in a drop-down list boxTo displays a dialog with a list of choices in a drop-down list box
14.56.27.Understanding the Message PropertyUnderstanding the Message Property
14.56.28.Using JOptionPane with a JSliderUsing JOptionPane with a JSlider
14.56.29.Displaying Multiline MessagesDisplaying Multiline Messages
14.56.30.Setting JOptionPane button labels to FrenchSetting JOptionPane button labels to French
14.56.31.Tip Of Day Dialog
14.56.32.About dialogAbout dialog
14.56.33.Create a Confirm Dialog Box
14.56.34.Create a Message Dialog Box
14.56.35.Yes no cancel dialog
14.56.36.OK cancel option dialog
14.56.37.Dialog with default options
14.56.38.Customize JOptionPane buttons
14.56.39.Modal dialog with yes/no button
14.56.40.Modal dialog with OK/cancel and a text field
14.56.41.Wait for a click and then quit
14.56.42.Localize a JOptionPane dialog
14.56.43.Modifiable JOptionPane
14.56.44.Customizing a JOptionPane Look and Feel