Java/Swing JFC/Radio Button
Содержание
- 1 A ButtonGroup voting booth
- 2 ButtonGroup Demo
- 3 Creating a JRadioButton Component
- 4 Group Action RadioButton
- 5 Group RadioButton
- 6 Implement group of buttons in an application
- 7 RadioButton Demo
- 8 Radio Button Mnemonic Key
- 9 React Radio button event
- 10 Selecting a JRadioButton Component in a Button Group
- 11 Using JRadioButtons
- 12 Working with the JRadioButton
A ButtonGroup voting booth
<source lang="java">
/* Java Swing, 2nd Edition By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole ISBN: 0-596-00408-7 Publisher: O"Reilly
- /
// SimpleButtonGroupExample.java //A ButtonGroup voting booth. // import java.awt.Container; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import javax.swing.AbstractButton; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JRadioButton; public class SimpleButtonGroupExample {
public static void main(String[] args) {
// Some choices
JRadioButton choice1, choice2, choice3;
choice1 = new JRadioButton("Bach: Well Tempered Clavier, Book I");
choice1.setActionCommand("bach1");
choice2 = new JRadioButton("Bach: Well Tempered Clavier, Book II");
choice2.setActionCommand("bach2");
choice3 = new JRadioButton("Shostakovich: 24 Preludes and Fugues");
choice3.setActionCommand("shostakovich");
// A group, to ensure that we only vote for one.
final ButtonGroup group = new ButtonGroup();
group.add(choice1);
group.add(choice2);
group.add(choice3);
// A simple ActionListener, showing each selection using the ButtonModel
class VoteActionListener implements ActionListener {
public void actionPerformed(ActionEvent ev) {
String choice = group.getSelection().getActionCommand();
System.out.println("ACTION Choice Selected: " + choice);
}
}
// A simple ItemListener, showing each selection and deselection
class VoteItemListener implements ItemListener {
public void itemStateChanged(ItemEvent ev) {
boolean selected = (ev.getStateChange() == ItemEvent.SELECTED);
AbstractButton button = (AbstractButton) ev.getItemSelectable();
System.out.println("ITEM Choice Selected: " + selected
+ ", Selection: " + button.getActionCommand());
}
}
// Add listeners to each button
ActionListener alisten = new VoteActionListener();
choice1.addActionListener(alisten);
choice2.addActionListener(alisten);
choice3.addActionListener(alisten);
ItemListener ilisten = new VoteItemListener();
choice1.addItemListener(ilisten);
choice2.addItemListener(ilisten);
choice3.addItemListener(ilisten);
// Throw everything together
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container c = frame.getContentPane();
c.setLayout(new GridLayout(0, 1));
c.add(new JLabel("Vote for your favorite prelude & fugue cycle"));
c.add(choice1);
c.add(choice2);
c.add(choice3);
frame.pack();
frame.setVisible(true);
}
}
</source>
ButtonGroup Demo
<source lang="java">
import java.awt.BorderLayout; import java.awt.Container; import java.awt.GridLayout; import javax.swing.AbstractButton; import javax.swing.BorderFactory; import javax.swing.ButtonGroup; import javax.swing.JCheckBox; import javax.swing.JCheckBoxMenuItem; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.JRadioButtonMenuItem; import javax.swing.JToggleButton; import javax.swing.border.Border; public class AButtonGroup {
public static void main(String args[]) {
JFrame frame = new JFrame("Button Group");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel panel = new JPanel(new GridLayout(0, 1));
Border border = BorderFactory.createTitledBorder("Examples");
panel.setBorder(border);
ButtonGroup group = new ButtonGroup();
AbstractButton abstract1 = new JToggleButton("Toggle Button");
panel.add(abstract1);
group.add(abstract1);
AbstractButton abstract2 = new JRadioButton("Radio Button");
panel.add(abstract2);
group.add(abstract2);
AbstractButton abstract3 = new JCheckBox("Check Box");
panel.add(abstract3);
group.add(abstract3);
AbstractButton abstract4 = new JRadioButtonMenuItem(
"Radio Button Menu Item");
panel.add(abstract4);
group.add(abstract4);
AbstractButton abstract5 = new JCheckBoxMenuItem("Check Box Menu Item");
panel.add(abstract5);
group.add(abstract5);
Container contentPane = frame.getContentPane();
contentPane.add(panel, BorderLayout.CENTER);
frame.setSize(300, 200);
frame.setVisible(true);
}
}
</source>
Creating a JRadioButton Component
<source lang="java">
import java.awt.event.ActionEvent; import javax.swing.AbstractAction; import javax.swing.Action; import javax.swing.ButtonGroup; import javax.swing.JRadioButton; public class Main {
public static void main(String[] argv) throws Exception {
Action action1 = new AbstractAction("RadioButton Label1") {
public void actionPerformed(ActionEvent evt) {
}
};
Action action2 = new AbstractAction("RadioButton Label2") {
public void actionPerformed(ActionEvent evt) {
}
};
JRadioButton b1 = new JRadioButton(action1);
JRadioButton b2 = new JRadioButton(action2);
ButtonGroup group = new ButtonGroup();
group.add(b1);
group.add(b2);
}
}
</source>
Group Action RadioButton
<source lang="java">
/* Definitive Guide to Swing for Java 2, Second Edition By John Zukowski ISBN: 1-893115-78-X Publisher: APress
- /
import java.awt.BorderLayout; import java.awt.ruponent; import java.awt.Container; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.util.Enumeration; import java.util.Vector; import javax.swing.AbstractButton; import javax.swing.BorderFactory; import javax.swing.ButtonGroup; import javax.swing.ButtonModel; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.border.Border; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class GroupActionRadio {
private static final String sliceOptions[] = { "4 slices", "8 slices",
"12 slices", "16 slices" };
private static final String crustOptions[] = { "Sicilian", "Thin Crust",
"Thick Crust", "Stuffed Crust" };
public static void main(String args[]) {
String title = (args.length == 0 ? "Grouping Example" : args[0]);
JFrame frame = new JFrame(title);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
// Slice Parts
ActionListener sliceActionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
AbstractButton aButton = (AbstractButton) actionEvent
.getSource();
System.out.println("Selected: " + aButton.getText());
}
};
Container sliceContainer = RadioButtonUtils.createRadioButtonGrouping(
sliceOptions, "Slice Count", sliceActionListener);
// Crust Parts
ActionListener crustActionListener = new ActionListener() {
String lastSelected;
public void actionPerformed(ActionEvent actionEvent) {
AbstractButton aButton = (AbstractButton) actionEvent
.getSource();
String label = aButton.getText();
String msgStart;
if (label.equals(lastSelected)) {
msgStart = "Reselected: ";
} else {
msgStart = "Selected: ";
}
lastSelected = label;
System.out.println(msgStart + label);
}
};
ItemListener itemListener = new ItemListener() {
String lastSelected;
public void itemStateChanged(ItemEvent itemEvent) {
AbstractButton aButton = (AbstractButton) itemEvent.getSource();
int state = itemEvent.getStateChange();
String label = aButton.getText();
String msgStart;
if (state == ItemEvent.SELECTED) {
if (label.equals(lastSelected)) {
msgStart = "Reselected -> ";
} else {
msgStart = "Selected -> ";
}
lastSelected = label;
} else {
msgStart = "Deselected -> ";
}
System.out.println(msgStart + label);
}
};
ChangeListener changeListener = new ChangeListener() {
public void stateChanged(ChangeEvent changEvent) {
AbstractButton aButton = (AbstractButton) changEvent
.getSource();
ButtonModel aModel = aButton.getModel();
boolean armed = aModel.isArmed();
boolean pressed = aModel.isPressed();
boolean selected = aModel.isSelected();
System.out.println("Changed: " + armed + "/" + pressed + "/"
+ selected);
}
};
final Container crustContainer = RadioButtonUtils
.createRadioButtonGrouping(crustOptions, "Crust Type",
crustActionListener, itemListener, changeListener);
// Button Parts
ActionListener buttonActionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
Enumeration selected = RadioButtonUtils
.getSelectedElements(crustContainer);
while (selected.hasMoreElements()) {
System.out.println("Selected -> " + selected.nextElement());
}
}
};
JButton button = new JButton("Order Pizza");
button.addActionListener(buttonActionListener);
Container contentPane = frame.getContentPane();
contentPane.add(sliceContainer, BorderLayout.WEST);
contentPane.add(crustContainer, BorderLayout.EAST);
contentPane.add(button, BorderLayout.SOUTH);
frame.setSize(300, 200);
frame.setVisible(true);
}
} class RadioButtonUtils {
private RadioButtonUtils() {
// private constructor so you can"t create instances
}
public static Enumeration getSelectedElements(Container container) {
Vector selections = new Vector();
Component components[] = container.getComponents();
for (int i = 0, n = components.length; i < n; i++) {
if (components[i] instanceof AbstractButton) {
AbstractButton button = (AbstractButton) components[i];
if (button.isSelected()) {
selections.addElement(button.getText());
}
}
}
return selections.elements();
}
public static Container createRadioButtonGrouping(String elements[]) {
return createRadioButtonGrouping(elements, null, null, null, null);
}
public static Container createRadioButtonGrouping(String elements[],
String title) {
return createRadioButtonGrouping(elements, title, null, null, null);
}
public static Container createRadioButtonGrouping(String elements[],
String title, ItemListener itemListener) {
return createRadioButtonGrouping(elements, title, null, itemListener,
null);
}
public static Container createRadioButtonGrouping(String elements[],
String title, ActionListener actionListener) {
return createRadioButtonGrouping(elements, title, actionListener, null,
null);
}
public static Container createRadioButtonGrouping(String elements[],
String title, ActionListener actionListener,
ItemListener itemListener) {
return createRadioButtonGrouping(elements, title, actionListener,
itemListener, null);
}
public static Container createRadioButtonGrouping(String elements[],
String title, ActionListener actionListener,
ItemListener itemListener, ChangeListener changeListener) {
JPanel panel = new JPanel(new GridLayout(0, 1));
// If title set, create titled border
if (title != null) {
Border border = BorderFactory.createTitledBorder(title);
panel.setBorder(border);
}
// Create group
ButtonGroup group = new ButtonGroup();
JRadioButton aRadioButton;
// For each String passed in:
// Create button, add to panel, and add to group
for (int i = 0, n = elements.length; i < n; i++) {
aRadioButton = new JRadioButton(elements[i]);
panel.add(aRadioButton);
group.add(aRadioButton);
if (actionListener != null) {
aRadioButton.addActionListener(actionListener);
}
if (itemListener != null) {
aRadioButton.addItemListener(itemListener);
}
if (changeListener != null) {
aRadioButton.addChangeListener(changeListener);
}
}
return panel;
}
}
</source>
Group RadioButton
<source lang="java">
/* Definitive Guide to Swing for Java 2, Second Edition By John Zukowski ISBN: 1-893115-78-X Publisher: APress
- /
import java.awt.BorderLayout; import java.awt.ruponent; import java.awt.Container; import java.awt.GridLayout; import java.awt.event.ActionListener; import java.awt.event.ItemListener; import java.util.Enumeration; import java.util.Vector; import javax.swing.AbstractButton; import javax.swing.BorderFactory; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.border.Border; import javax.swing.event.ChangeListener; public class GroupRadio {
private static final String sliceOptions[] = { "4 slices", "8 slices",
"12 slices", "16 slices" };
private static final String crustOptions[] = { "Sicilian", "Thin Crust",
"Thick Crust", "Stuffed Crust" };
public static void main(String args[]) {
JFrame frame = new JFrame("Grouping Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container sliceContainer = RadioButtonUtils.createRadioButtonGrouping(
sliceOptions, "Slice Count");
Container crustContainer = RadioButtonUtils.createRadioButtonGrouping(
crustOptions, "Crust Type");
Container contentPane = frame.getContentPane();
contentPane.add(sliceContainer, BorderLayout.WEST);
contentPane.add(crustContainer, BorderLayout.EAST);
frame.setSize(300, 200);
frame.setVisible(true);
}
} class RadioButtonUtils {
private RadioButtonUtils() {
// private constructor so you can"t create instances
}
public static Enumeration getSelectedElements(Container container) {
Vector selections = new Vector();
Component components[] = container.getComponents();
for (int i = 0, n = components.length; i < n; i++) {
if (components[i] instanceof AbstractButton) {
AbstractButton button = (AbstractButton) components[i];
if (button.isSelected()) {
selections.addElement(button.getText());
}
}
}
return selections.elements();
}
public static Container createRadioButtonGrouping(String elements[]) {
return createRadioButtonGrouping(elements, null, null, null, null);
}
public static Container createRadioButtonGrouping(String elements[],
String title) {
return createRadioButtonGrouping(elements, title, null, null, null);
}
public static Container createRadioButtonGrouping(String elements[],
String title, ItemListener itemListener) {
return createRadioButtonGrouping(elements, title, null, itemListener,
null);
}
public static Container createRadioButtonGrouping(String elements[],
String title, ActionListener actionListener) {
return createRadioButtonGrouping(elements, title, actionListener, null,
null);
}
public static Container createRadioButtonGrouping(String elements[],
String title, ActionListener actionListener,
ItemListener itemListener) {
return createRadioButtonGrouping(elements, title, actionListener,
itemListener, null);
}
public static Container createRadioButtonGrouping(String elements[],
String title, ActionListener actionListener,
ItemListener itemListener, ChangeListener changeListener) {
JPanel panel = new JPanel(new GridLayout(0, 1));
// If title set, create titled border
if (title != null) {
Border border = BorderFactory.createTitledBorder(title);
panel.setBorder(border);
}
// Create group
ButtonGroup group = new ButtonGroup();
JRadioButton aRadioButton;
// For each String passed in:
// Create button, add to panel, and add to group
for (int i = 0, n = elements.length; i < n; i++) {
aRadioButton = new JRadioButton(elements[i]);
panel.add(aRadioButton);
group.add(aRadioButton);
if (actionListener != null) {
aRadioButton.addActionListener(actionListener);
}
if (itemListener != null) {
aRadioButton.addItemListener(itemListener);
}
if (changeListener != null) {
aRadioButton.addChangeListener(changeListener);
}
}
return panel;
}
}
</source>
Implement group of buttons in an application
<source lang="java">
import java.awt.Container; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import javax.swing.AbstractButton; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JRadioButton; public class Main {
public static void main(String[] args) {
JRadioButton choice1, choice2, choice3;
choice1 = new JRadioButton("A");
choice1.setActionCommand("A");
choice2 = new JRadioButton("B");
choice2.setActionCommand("B");
choice3 = new JRadioButton("C");
choice3.setActionCommand("C");
final ButtonGroup group = new ButtonGroup();
group.add(choice1);
group.add(choice2);
group.add(choice3);
class VoteActionListener implements ActionListener {
public void actionPerformed(ActionEvent ev) {
System.out.println(group.getSelection().getActionCommand());
}
}
ActionListener alisten = new VoteActionListener();
choice1.addActionListener(alisten);
choice2.addActionListener(alisten);
choice3.addActionListener(alisten);
ItemListener ilisten = new VoteItemListener();
choice1.addItemListener(ilisten);
choice2.addItemListener(ilisten);
choice3.addItemListener(ilisten);
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
Container c = frame.getContentPane();
c.setLayout(new GridLayout(0, 1));
c.add(choice1);
c.add(choice2);
c.add(choice3);
frame.pack();
frame.setVisible(true);
}
}
class VoteItemListener implements ItemListener {
public void itemStateChanged(ItemEvent ev) {
boolean selected = (ev.getStateChange() == ItemEvent.SELECTED);
AbstractButton button = (AbstractButton) ev.getItemSelectable();
System.out.println(selected + ", Selection: "
+ button.getActionCommand());
}
}
</source>
RadioButton Demo
<source lang="java">
import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.ItemEvent; import java.awt.event.ItemListener; import java.awt.event.KeyEvent; import javax.swing.AbstractButton; import javax.swing.ButtonGroup; import javax.swing.Icon; import javax.swing.ImageIcon; import javax.swing.JFrame; import javax.swing.JMenu; import javax.swing.JMenuBar; import javax.swing.JRadioButtonMenuItem; public class RadioButtonSample {
static Icon threeIcon = new ImageIcon("3.gif");
static Icon fourIcon = new ImageIcon("4.gif");
static Icon fiveIcon = new ImageIcon("5.gif");
static Icon sixIcon = new ImageIcon("6.gif");
public static void main(String args[]) {
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
AbstractButton aButton = (AbstractButton) actionEvent
.getSource();
boolean selected = aButton.getModel().isSelected();
System.out.println(actionEvent.getActionCommand()
+ " - selected? " + selected);
}
};
ItemListener itemListener = new ItemListener() {
public void itemStateChanged(ItemEvent itemEvent) {
AbstractButton aButton = (AbstractButton) itemEvent.getSource();
int state = itemEvent.getStateChange();
String selected = ((state == ItemEvent.SELECTED) ? "selected"
: "not selected");
System.out.println(aButton.getText() + " - selected? "
+ selected);
}
};
JFrame frame = new JFrame("Radio Menu Example");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JMenuBar menuBar = new JMenuBar();
JMenu menu = new JMenu("Menu");
ButtonGroup buttonGroup = new ButtonGroup();
menu.setMnemonic(KeyEvent.VK_M);
JRadioButtonMenuItem emptyMenuItem = new JRadioButtonMenuItem();
emptyMenuItem.setActionCommand("Empty");
emptyMenuItem.addActionListener(actionListener);
buttonGroup.add(emptyMenuItem);
menu.add(emptyMenuItem);
JRadioButtonMenuItem oneMenuItem = new JRadioButtonMenuItem("Partridge");
oneMenuItem.addActionListener(actionListener);
buttonGroup.add(oneMenuItem);
menu.add(oneMenuItem);
JRadioButtonMenuItem twoMenuItem = new JRadioButtonMenuItem(
"Turtle Doves", true);
twoMenuItem.addActionListener(actionListener);
buttonGroup.add(twoMenuItem);
menu.add(twoMenuItem);
JRadioButtonMenuItem threeMenuItem = new JRadioButtonMenuItem(
"French Hens", threeIcon);
threeMenuItem.addItemListener(itemListener);
buttonGroup.add(threeMenuItem);
menu.add(threeMenuItem);
JRadioButtonMenuItem fourMenuItem = new JRadioButtonMenuItem(
"Calling Birds", fourIcon, true);
fourMenuItem.addActionListener(actionListener);
buttonGroup.add(fourMenuItem);
menu.add(fourMenuItem);
JRadioButtonMenuItem fiveMenuItem = new JRadioButtonMenuItem(fiveIcon);
fiveMenuItem.addActionListener(actionListener);
fiveMenuItem.setActionCommand("Rings");
buttonGroup.add(fiveMenuItem);
menu.add(fiveMenuItem);
JRadioButtonMenuItem sixMenuItem = new JRadioButtonMenuItem(sixIcon,
true);
sixMenuItem.addActionListener(actionListener);
sixMenuItem.setActionCommand("Geese");
buttonGroup.add(sixMenuItem);
menu.add(sixMenuItem);
menuBar.add(menu);
frame.setJMenuBar(menuBar);
frame.setSize(350, 250);
frame.setVisible(true);
}
}
</source>
Radio Button Mnemonic Key
<source lang="java">
/* From http://java.sun.ru/docs/books/tutorial/index.html */ /*
* Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* -Redistribution of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* -Redistribution in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of Sun Microsystems, Inc. or the names of contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* This software is provided "AS IS," without a warranty of any kind. ALL
* EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING
* ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
* OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN")
* AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE
* AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS
* DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST
* REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL,
* INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY
* OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE,
* EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
*
* You acknowledge that this software is not designed, licensed or intended
* for use in the design, construction, operation or maintenance of any
* nuclear facility.
*/
import java.awt.BorderLayout; import java.awt.Dimension; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import javax.swing.BorderFactory; import javax.swing.ButtonGroup; import javax.swing.ImageIcon; import javax.swing.JComponent; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JRadioButton; /*
* RadioButtonDemo.java is a 1.4 application that requires these files: * images/Bird.gif images/Cat.gif images/Dog.gif images/Rabbit.gif * images/Pig.gif */
public class RadioButtonDemo extends JPanel implements ActionListener {
static String birdString = "Bird";
static String catString = "Cat";
static String dogString = "Dog";
static String rabbitString = "Rabbit";
static String pigString = "Pig";
JLabel picture;
public RadioButtonDemo() {
super(new BorderLayout());
//Create the radio buttons.
JRadioButton birdButton = new JRadioButton(birdString);
birdButton.setMnemonic(KeyEvent.VK_B);
birdButton.setActionCommand(birdString);
birdButton.setSelected(true);
JRadioButton catButton = new JRadioButton(catString);
catButton.setMnemonic(KeyEvent.VK_C);
catButton.setActionCommand(catString);
JRadioButton dogButton = new JRadioButton(dogString);
dogButton.setMnemonic(KeyEvent.VK_D);
dogButton.setActionCommand(dogString);
JRadioButton rabbitButton = new JRadioButton(rabbitString);
rabbitButton.setMnemonic(KeyEvent.VK_R);
rabbitButton.setActionCommand(rabbitString);
JRadioButton pigButton = new JRadioButton(pigString);
pigButton.setMnemonic(KeyEvent.VK_P);
pigButton.setActionCommand(pigString);
//Group the radio buttons.
ButtonGroup group = new ButtonGroup();
group.add(birdButton);
group.add(catButton);
group.add(dogButton);
group.add(rabbitButton);
group.add(pigButton);
//Register a listener for the radio buttons.
birdButton.addActionListener(this);
catButton.addActionListener(this);
dogButton.addActionListener(this);
rabbitButton.addActionListener(this);
pigButton.addActionListener(this);
//Set up the picture label.
picture = new JLabel(createImageIcon("images/" + birdString + ".gif"));
//The preferred size is hard-coded to be the width of the
//widest image and the height of the tallest image.
//A real program would compute this.
picture.setPreferredSize(new Dimension(177, 122));
//Put the radio buttons in a column in a panel.
JPanel radioPanel = new JPanel(new GridLayout(0, 1));
radioPanel.add(birdButton);
radioPanel.add(catButton);
radioPanel.add(dogButton);
radioPanel.add(rabbitButton);
radioPanel.add(pigButton);
add(radioPanel, BorderLayout.LINE_START);
add(picture, BorderLayout.CENTER);
setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
}
/** Listens to the radio buttons. */
public void actionPerformed(ActionEvent e) {
picture.setIcon(createImageIcon("images/" + e.getActionCommand()
+ ".gif"));
}
/** Returns an ImageIcon, or null if the path was invalid. */
protected static ImageIcon createImageIcon(String path) {
java.net.URL imgURL = RadioButtonDemo.class.getResource(path);
if (imgURL != null) {
return new ImageIcon(imgURL);
} else {
System.err.println("Couldn"t find file: " + path);
return null;
}
}
/**
* Create the GUI and show it. For thread safety, this method should be
* invoked from the event-dispatching thread.
*/
private static void createAndShowGUI() {
//Make sure we have nice window decorations.
JFrame.setDefaultLookAndFeelDecorated(true);
//Create and set up the window.
JFrame frame = new JFrame("RadioButtonDemo");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//Create and set up the content pane.
JComponent newContentPane = new RadioButtonDemo();
newContentPane.setOpaque(true); //content panes must be opaque
frame.setContentPane(newContentPane);
//Display the window.
frame.pack();
frame.setVisible(true);
}
public static void main(String[] args) {
//Schedule a job for the event-dispatching thread:
//creating and showing this application"s GUI.
javax.swing.SwingUtilities.invokeLater(new Runnable() {
public void run() {
createAndShowGUI();
}
});
}
}
</source>
React Radio button event
<source lang="java">
import java.awt.Font; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.WindowAdapter; import java.awt.event.WindowEvent; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.JRadioButton; public class RadioButtonTest extends JFrame implements ActionListener {
JLabel label = new JLabel("The quick brown fox jumps over the lazy dog.");
private JRadioButton smallButton;
private JRadioButton mediumButton;
private JRadioButton largeButton;
private JRadioButton xlargeButton;
public RadioButtonTest() {
setTitle("RadioButtonTest");
setSize(400, 200);
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
JPanel buttonPanel = new JPanel();
ButtonGroup group = new ButtonGroup();
smallButton = addRadioButton(buttonPanel, group, "Small", false);
mediumButton = addRadioButton(buttonPanel, group, "Medium", true);
largeButton = addRadioButton(buttonPanel, group, "Large", false);
xlargeButton = addRadioButton(buttonPanel, group, "Extra large", false);
getContentPane().add(buttonPanel, "South");
getContentPane().add(label, "Center");
}
public JRadioButton addRadioButton(JPanel buttonPanel, ButtonGroup g,
String buttonName, boolean v) {
JRadioButton button = new JRadioButton(buttonName, v);
button.addActionListener(this);
g.add(button);
buttonPanel.add(button);
return button;
}
public void actionPerformed(ActionEvent evt) {
Object source = evt.getSource();
if (source == smallButton)
label.setFont(new Font("SansSerif", Font.PLAIN, 8));
else if (source == mediumButton)
label.setFont(new Font("SansSerif", Font.PLAIN, 12));
else if (source == largeButton)
label.setFont(new Font("SansSerif", Font.PLAIN, 14));
else if (source == xlargeButton)
label.setFont(new Font("SansSerif", Font.PLAIN, 18));
}
public static void main(String[] args) {
JFrame frame = new RadioButtonTest();
frame.show();
}
}
</source>
Selecting a JRadioButton Component in a Button Group
<source lang="java">
import javax.swing.ButtonGroup; import javax.swing.ButtonModel; import javax.swing.JRadioButton; public class Main {
public static void main(String[] argv) throws Exception {
JRadioButton radioButton = new JRadioButton();
ButtonGroup group = new ButtonGroup();
ButtonModel model = radioButton.getModel();
group.setSelected(model, true);
}
}
</source>
Using JRadioButtons
<source lang="java">
// : c14:SwingRadioButtons.java // Using JRadioButtons. // <applet code=SwingRadioButtons width=200 height=100></applet> // From "Thinking in Java, 3rd ed." (c) Bruce Eckel 2002 // www.BruceEckel.ru. See copyright notice in CopyRight.txt. import java.awt.Container; import java.awt.FlowLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.ButtonGroup; import javax.swing.JApplet; import javax.swing.JFrame; import javax.swing.JRadioButton; import javax.swing.JTextField; public class SwingRadioButtons extends JApplet {
private JTextField t = new JTextField(15);
private ButtonGroup g = new ButtonGroup();
private JRadioButton rb1 = new JRadioButton("one", false),
rb2 = new JRadioButton("two", false), rb3 = new JRadioButton(
"three", false);
private ActionListener al = new ActionListener() {
public void actionPerformed(ActionEvent e) {
t.setText("Radio button "
+ ((JRadioButton) e.getSource()).getText());
}
};
public void init() {
rb1.addActionListener(al);
rb2.addActionListener(al);
rb3.addActionListener(al);
g.add(rb1);
g.add(rb2);
g.add(rb3);
t.setEditable(false);
Container cp = getContentPane();
cp.setLayout(new FlowLayout());
cp.add(t);
cp.add(rb1);
cp.add(rb2);
cp.add(rb3);
}
public static void main(String[] args) {
run(new SwingRadioButtons(), 200, 100);
}
public static void run(JApplet applet, int width, int height) {
JFrame frame = new JFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(applet);
frame.setSize(width, height);
applet.init();
applet.start();
frame.setVisible(true);
}
} ///:~
</source>
Working with the JRadioButton
<source lang="java">
import java.awt.Container; import java.awt.GridLayout; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JRadioButton; public class SwingRadioButtonTest {
public static void main(String args[]) {
JFrame frame = new JFrame();
Container contentPane = frame.getContentPane();
contentPane.setLayout(new GridLayout(0, 1));
ButtonGroup group = new ButtonGroup();
JRadioButton option = new JRadioButton("French Fries", true);
group.add(option);
contentPane.add(option);
option = new JRadioButton("Onion Rings", false);
group.add(option);
contentPane.add(option);
option = new JRadioButton("Ice Cream", false);
group.add(option);
contentPane.add(option);
frame.setSize(200, 200);
frame.show();
}
}
</source>
