Java Tutorial/Swing/JRadioButton

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Creating JRadioButton Components

  1. A JRadioButton represents a radio button.
  2. You can use multiple JRadioButtons to represents a selection from which only one item can be selected.
  3. To indicate a logical grouping of radio buttons, you use a javax.swing.ButtonGroup object.
  4. To programmatically select a JRadioButton, you pass true to its setSelected method.



   <source lang="java">

public JRadioButton() JRadioButton aRadioButton = new JRadioButton(); public JRadioButton(Icon icon) JRadioButton aRadioButton = new JRadioButton(new DiamondIcon(Color.CYAN, false)); aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true)); public JRadioButton(Icon icon, boolean selected) JRadioButton aRadioButton = new JRadioButton(new DiamondIcon(Color.CYAN, false), true); aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true)); public JRadioButton(String text) JRadioButton aRadioButton = new JRadioButton("4 slices"); public JRadioButton(String text, boolean selected) JRadioButton aRadioButton = new JRadioButton("8 slices", true); public JRadioButton(String text, Icon icon) JRadioButton aRadioButton = new JRadioButton("12 slices", new DiamondIcon(Color.CYAN, false)); aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true)); public JRadioButton(String text, Icon icon, boolean selected) JRadioButton aRadioButton = new JRadioButton("16 slices", new DiamondIcon(Color.CYAN, false), true); aRadioButton.setSelectedIcon(new DiamondIcon(Color.BLUE, true)); public JRadioButton(Action action) Action action = ...; JRadioButton aRadioButton = new JRadioButton(action);</source>





Customizing JRadioButton Look and Feel

Property StringObject TypeRadioButton.backgroundColorRadioButton.borderBorderRadioButton.darkShadowColorRadioButton.disabledTextColorRadioButton.focusColorRadioButton.focusInputMapObject[ ]RadioButton.fontFontRadioButton.foregroundColorRadioButton.gradientListRadioButton.highlightColorRadioButton.iconIconRadioButton.interiorBackgroundColorRadioButton.lightColorRadioButton.marginInsetsRadioButton.rolloverBooleanRadioButton.selectColorRadioButton.shadowColorRadioButton.textIconGapIntegerRadioButton.textShiftOffsetIntegerRadioButtonUIString


Determining the Selected JRadioButton in a Button Group

   <source lang="java">

import java.util.Enumeration; import javax.swing.ButtonGroup; import javax.swing.JRadioButton; public class Main { 

 public static void main(String[] argv) throws Exception {
 }
 public static JRadioButton getSelection(ButtonGroup group) {
   for (Enumeration e = group.getElements(); e.hasMoreElements();) {
     JRadioButton b = (JRadioButton) e.nextElement();
     if (b.getModel() == group.getSelection()) {
       return b;
     }
   }
   return null;
 }

}</source>





Event sequence: Action Event, Item Event and Change Event

   <source lang="java">

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.ButtonModel; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class JRadioButtonEventSequence { 

 public static void main(String args[]) {
   JFrame frame = new JFrame("Grouping Example");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel panel = new JPanel(new GridLayout(0, 1));
   ButtonGroup group = new ButtonGroup();
   JRadioButton aRadioButton = new JRadioButton("A");
   JRadioButton bRadioButton = new JRadioButton("B");
   ActionListener actionListener = 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);
     }
   };
   panel.add(aRadioButton);
   group.add(aRadioButton);
   panel.add(bRadioButton);
   group.add(bRadioButton);
   aRadioButton.addChangeListener(changeListener);
   bRadioButton.addChangeListener(changeListener);
   aRadioButton.addActionListener(actionListener);
   bRadioButton.addActionListener(actionListener);
   aRadioButton.addItemListener(itemListener);
   bRadioButton.addItemListener(itemListener);
   frame.add(panel);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

}</source>





Getting selected JRadioButton in a container

   <source lang="java">

import java.awt.ruponent; import java.awt.Container; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.Enumeration; import java.util.Vector; import javax.swing.AbstractButton; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; public class JRadioButtonSelectedElements { 

 public static void main(String args[]) {
   JFrame frame = new JFrame("Grouping Example");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel panel = new JPanel(new GridLayout(0, 1));
   ButtonGroup group = new ButtonGroup();
   JRadioButton aRadioButton = new JRadioButton("A");
   JRadioButton bRadioButton = new JRadioButton("B");
   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);
     }
   };
   panel.add(aRadioButton);
   group.add(aRadioButton);
   panel.add(bRadioButton);
   group.add(bRadioButton);
   aRadioButton.addActionListener(crustActionListener);
   bRadioButton.addActionListener(crustActionListener);
   frame.add(panel);
   frame.setSize(300, 200);
   frame.setVisible(true);
   
   System.out.println(getSelectedElements(panel).hasMoreElements());
 }
 public static Enumeration<String> getSelectedElements(Container container) {
   Vector<String> selections = new Vector<String>();
   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();
 }

}</source>





Grouping JRadioButton Components in a ButtonGroup

   <source lang="java">

import java.awt.BorderLayout; import java.awt.Container; import java.awt.GridLayout; 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; class RadioButtonUtils { 

 public static Container createRadioButtonGrouping(String elements[], String title) {
   JPanel panel = new JPanel(new GridLayout(0, 1));
   if (title != null) {
     Border border = BorderFactory.createTitledBorder(title);
     panel.setBorder(border);
   }
   ButtonGroup group = new ButtonGroup();
   JRadioButton aRadioButton;
   for (int i = 0, n = elements.length; i < n; i++) {
     aRadioButton = new JRadioButton(elements[i]);
     panel.add(aRadioButton);
     group.add(aRadioButton);
   }
   return panel;
 }

} public class GroupJRadioButton { 

 private static final String sliceOptions[] = { "4", "8", "12", "16" };
 private static final String crustOptions[] = { "A", "B", "C", "D" };
 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");
   frame.add(sliceContainer, BorderLayout.WEST);
   frame.add(crustContainer, BorderLayout.EAST);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

}</source>





Listening to JRadioButton Events with a ChangeListener

when the selected radio button is armed, pressed, selected, or released



   <source lang="java">

import java.awt.GridLayout; import javax.swing.AbstractButton; import javax.swing.ButtonGroup; import javax.swing.ButtonModel; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; import javax.swing.event.ChangeEvent; import javax.swing.event.ChangeListener; public class JRadioButtonChangeListener { 

 public static void main(String args[]) {
   JFrame frame = new JFrame("Grouping Example");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel panel = new JPanel(new GridLayout(0, 1));
   ButtonGroup group = new ButtonGroup();
   JRadioButton aRadioButton = new JRadioButton("A");
   JRadioButton bRadioButton = new JRadioButton("B");
   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);
     }
   };
   panel.add(aRadioButton);
   group.add(aRadioButton);
   panel.add(bRadioButton);
   group.add(bRadioButton);
   aRadioButton.addChangeListener(changeListener);
   bRadioButton.addChangeListener(changeListener);
   frame.add(panel);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

}</source>





Listening to JRadioButton Events with an ActionListener

   <source lang="java">

import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.AbstractButton; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; public class JRadioButtonActionListener { 

 public static void main(String args[]) {
   JFrame frame = new JFrame("Grouping Example");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel panel = new JPanel(new GridLayout(0, 1));
   ButtonGroup group = new ButtonGroup();
   JRadioButton aRadioButton = new JRadioButton("A");
   JRadioButton bRadioButton = new JRadioButton("B");
   ActionListener sliceActionListener = new ActionListener() {
     public void actionPerformed(ActionEvent actionEvent) {
       AbstractButton aButton = (AbstractButton) actionEvent.getSource();
       System.out.println("Selected: " + aButton.getText());
     }
   };
   panel.add(aRadioButton);
   group.add(aRadioButton);
   panel.add(bRadioButton);
   group.add(bRadioButton);
   aRadioButton.addActionListener(sliceActionListener);
   bRadioButton.addActionListener(sliceActionListener);

   frame.add(panel);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

}</source>





Listening to JRadioButton Events with an ItemListener

   <source lang="java">

import java.awt.GridLayout; 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.JPanel; import javax.swing.JRadioButton; public class JRadioButtonItemListener { 

 public static void main(String args[]) {
   JFrame frame = new JFrame("Grouping Example");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel panel = new JPanel(new GridLayout(0, 1));
   ButtonGroup group = new ButtonGroup();
   JRadioButton aRadioButton = new JRadioButton("A");
   JRadioButton bRadioButton = new JRadioButton("B");
   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);
     }
   };
   panel.add(aRadioButton);
   group.add(aRadioButton);
   panel.add(bRadioButton);
   group.add(bRadioButton);
   aRadioButton.addItemListener(itemListener);
   bRadioButton.addItemListener(itemListener);
   frame.add(panel);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

}</source>





Reference to the last selected item and check for reselection

   <source lang="java">

import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.AbstractButton; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JPanel; import javax.swing.JRadioButton; public class JRadioButtonActionListenerSelectedItem { 

 public static void main(String args[]) {
   JFrame frame = new JFrame("Grouping Example");
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JPanel panel = new JPanel(new GridLayout(0, 1));
   ButtonGroup group = new ButtonGroup();
   JRadioButton aRadioButton = new JRadioButton("A");
   JRadioButton bRadioButton = new JRadioButton("B");
   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);
     }
   };
   panel.add(aRadioButton);
   group.add(aRadioButton);
   panel.add(bRadioButton);
   group.add(bRadioButton);
   aRadioButton.addActionListener(crustActionListener);
   bRadioButton.addActionListener(crustActionListener);
   frame.add(panel);
   frame.setSize(300, 200);
   frame.setVisible(true);
 }

}</source>





Using JRadioButton

   <source lang="java">

import java.awt.FlowLayout; import javax.swing.ButtonGroup; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JRadioButton; public class JRadioButtonTest { 

 public static void main(String[] args) {
   JFrame.setDefaultLookAndFeelDecorated(true);
   JFrame frame = new JFrame("JRadioButton Test");
   frame.setLayout(new FlowLayout());
   frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
   JRadioButton button1 = new JRadioButton("Red");
   JRadioButton button2 = new JRadioButton("Green");
   JRadioButton button3 = new JRadioButton("Blue");
   ButtonGroup colorButtonGroup = new ButtonGroup();
   colorButtonGroup.add(button1);
   colorButtonGroup.add(button2);
   colorButtonGroup.add(button3);
   button1.setSelected(true);
   frame.add(new JLabel("Color:"));
   frame.add(button1);
   frame.add(button2);
   frame.add(button3);
   frame.pack();
   frame.setVisible(true);
 }

}</source>


Источник — «http://jexp.ru/index.php?title=Java_Tutorial/Swing/JRadioButton&oldid=3888»