Java JOptionPane class example

Thursday, August 26, 2010

JOptionPane

Java Swing Tutorial Explaining the JOptionPane Component. JOptionPane Contains classes used for a graphical user interface (GUI) Facilitates data entry and data output. class JOptionPane contains methods that display a dialog box. The JOptionPane class provides static methods to display each type of dialog box.
Swing JOptionPane allows you to
  • Allows you to create a dialog box
  • Display information
  • Request information
  • Give the user a choice with buttons
JOptionPnae Example Dialogs
String showInputDialog
  • prompt for input
  • return a string
void showMessageDialog
  • display a message
  • wait for an acknowledgement
int showConfirmDialog
  • ask a yes/no question
  • wait for a response

JOptionPane Source Code

The JOptionPane class is not automatically available to your Java programs.The following statement must be before the program’s class header: This statement tells the compiler where to find the JOptionPane class
import javax.swing.*;
import javax.swing.JOptionPane; 



import java.awt.*;
import java.awt.event.*;
import java.util.StringTokenizer;

public class JOptionPaneDemo extends JFrame implements ActionListener {

 Container contentPane = null;
 private JButton jbnDialog;
 String ButtonLabels;
 private JRadioButton[] dialogTypeButtons;
 private JRadioButton[] messageTypeButtons;
 private int[] messageTypes = { JOptionPane.PLAIN_MESSAGE,
   JOptionPane.INFORMATION_MESSAGE, JOptionPane.QUESTION_MESSAGE,
   JOptionPane.WARNING_MESSAGE, JOptionPane.ERROR_MESSAGE };
 private ButtonGroup messageTypeButtonGroup, buttonTypeButtonGroup,
   dialogTypeButtonGroup;
 private JRadioButton[] optionTypeButtons;
 private int[] OptionTypes = { JOptionPane.DEFAULT_OPTION,
   JOptionPane.YES_NO_OPTION, JOptionPane.YES_NO_CANCEL_OPTION,
   JOptionPane.OK_CANCEL_OPTION };
 public static void main(String[] args) {
  new JOptionPaneDemo();
 }
 public JOptionPaneDemo() {
  super("JOptionPane Source Demo");
  addWindowListener(new WindowListener());
  contentPane = getContentPane();
  contentPane.setLayout(new GridLayout(0, 1));
  JPanel jplButton = new JPanel();
  jbnDialog = new JButton("Show an Option Pane");
  jbnDialog.addActionListener(this);
  jplButton.add(jbnDialog);
  contentPane.add(jplButton);
  createRadioButtonGroupings();
  ButtonLabels = "Button1 Button2 Button3";
  pack();
  setVisible(true);
 }
 public void createRadioButtonGroupings() {
  JPanel jplDialogType = new JPanel();
  dialogTypeButtonGroup = new ButtonGroup();
  dialogTypeButtons = new JRadioButton[] {
    new JRadioButton("Show Message", true),
    new JRadioButton("Get Confirmation"),
    new JRadioButton("Collect Input"),
    new JRadioButton("Present Options") };
  for (int i = 0; i < dialogTypeButtons.length; i++) {
   dialogTypeButtonGroup.add(dialogTypeButtons[i]);
   jplDialogType.add(dialogTypeButtons[i]);
  }
  contentPane.add(jplDialogType);
  JPanel jplMessageType = new JPanel();
  messageTypeButtonGroup = new ButtonGroup();
  messageTypeButtons = new JRadioButton[] {
    new JRadioButton("Plain"),
    new JRadioButton("Information", true),
    new JRadioButton("Question"), new JRadioButton("Warning"),
    new JRadioButton("Error") };
  for (int i = 0; i < messageTypeButtons.length; i++) {
   messageTypeButtonGroup.add(messageTypeButtons[i]);
   jplMessageType.add(messageTypeButtons[i]);
  }
  contentPane.add(jplMessageType);
  JPanel jplButtonType = new JPanel();
  buttonTypeButtonGroup = new ButtonGroup();
  optionTypeButtons = new JRadioButton[] {
    new JRadioButton("Default", true),
    new JRadioButton("Yes/No"),
    new JRadioButton("Yes/No/Cancel"),
    new JRadioButton("OK/Cancel") };
  for (int i = 0; i < optionTypeButtons.length; i++) {
   buttonTypeButtonGroup.add(optionTypeButtons[i]);
   jplButtonType.add(optionTypeButtons[i]);
  }
  contentPane.add(jplButtonType);
 }
 // Windows Listener for Window Closing
 public class WindowListener extends WindowAdapter {

  public void windowClosing(WindowEvent event) {
   System.exit(0);
  }
 }
 public void actionPerformed(ActionEvent event) {
  /*
   * dialogTypeButtons =
   *
   * new JRadioButton[] { new JRadioButton("Show Message", true),
   *
   * new JRadioButton("Get Confirmation"),
   *
   * new JRadioButton("Collect Input"),
   *
   * new JRadioButton("Present Options") };
   */
  if (dialogTypeButtons[0].isSelected()) {
   JOptionPane.showMessageDialog(this, "Show Message",
     "Simple Dialog", getMessageType());
  } else if (dialogTypeButtons[1].isSelected()) {
   JOptionPane.showConfirmDialog(this, "Get Confirmation",
     "Simple Dialog", getButtonType(), getMessageType());
  } else if (dialogTypeButtons[2].isSelected()) {
   JOptionPane.showInputDialog(this, "Collect Input",
     "Simple Dialog", getMessageType(), null, null, null);
  } else if (dialogTypeButtons[3].isSelected()) {
   JOptionPane.showOptionDialog(this, "Present Options",
     "Simple Dialog", getButtonType(), getMessageType(),
     null, substrings(ButtonLabels), null);
  }
 }
 private int getAssociatedType(AbstractButton[] buttons, int[] types) {
  for (int i = 0; i < buttons.length; i++) {
   if (buttons[i].isSelected()) {
    return (types[i]);
   }
  }
  return (types[0]);
 }
 private int getMessageType() {
  return (getAssociatedType(messageTypeButtons, messageTypes));
 }
 private int getButtonType() {
  return (getAssociatedType(optionTypeButtons, OptionTypes));
 }
 private String[] substrings(String string) {
  StringTokenizer tok = new StringTokenizer(string);
  String[] substrings = new String[tok.countTokens()];
  for (int i = 0; i < substrings.length; i++)
   substrings[i] = tok.nextToken();
  return (substrings);
 }
}
Output
Download JOptionPane Source Code

Java JOptionPane Hierarchy

javax.swing
Class JOptionPane
java.lang.Object
java.awt.Component
java.awt.Container
javax.swing.JComponent
javax.swing.JOptionPane
All Implemented Interfaces:
Accessible, ImageObserver, MenuContainer, Serializable

JOptionPane Constructor

JOptionPane()
Creates a JOptionPane with a test message.
JOptionPane(Object message)
Creates a instance of JOptionPane to display a message using the plain-message message type and the default options delivered by the UI.
JOptionPane(Object message, int messageType)
Creates an instance of JOptionPane to display a message with the specified message type and the default options,
JOptionPane(Object message, int messageType, int optionType)
Creates an instance of JOptionPane to display a message with the specified message type and options.
JOptionPane(Object message, int messageType, int optionType, Icon icon)
Creates an instance of JOptionPane to display a message with the specified message type, options, and icon.
JOptionPane(Object message, int messageType, int optionType, Icon icon, Object[] options)
Creates an instance of JOptionPane to display a message with the specified message type, icon, and options.
JOptionPane(Object message, int messageType, int optionType, Icon icon, Object[] options, Object initialValue)
Creates an instance of JOptionPane to display a message with the specified message type, icon, and options, with the initially-selected option specified

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Posted by www.wlanguages.tk at 7:04 AM

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