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JRadioButton provides several constructors The two used by this recipe are shown here: JRadioButton(String str) JRadioButton(String str, boolean state) Here, str is the label for the button The first constructor creates a button that is cleared by default For the second constructor, if state is true, the button is selected Otherwise, it is cleared In order for the buttons to be mutually exclusive, they must be configured into a group Once this is done, only one of the buttons in the group can be selected at any time For example, if a user selects a radio button that is in a group, any previously selected button in that group is automatically deselected Of course, each button group is separate from the next Thus, you can have two different groups of radio buttons, each having one button selected A button group is created by the ButtonGroup class Its default constructor is invoked for this purpose Elements are then added to the button group via the following method: void add(AbstractButton ab) Here, ab is a reference to the button to be added to the group
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A JRadioButton generates action events, item events, and change events each time the button selection changes Most often it is the action event that is handled, which means that you will normally implement the ActionListener interface Action events and action listeners are described in detail in Create a Simple Push Button As explained there, the only method defined by ActionListener is actionPerformed( ) Inside this method, you can use a number of different ways to determine which button was selected First, you can check the action command string associated with the action event by calling getActionCommand( ) By default the action command is the same as the button label, but you can set the action command to something else by calling setActionCommand( ) on the radio button Second, you can call getSource( ) on the ActionEvent object, and check that reference against the buttons Finally, you can simply check each radio button to find out which one is currently selected by calling isSelected( ) on each button Remember, each time an action event occurs, it means that the button being selected has changed, and that one and only one button will be selected When using radio buttons, you will normally want to initially select one of the buttons This is done by calling setSelected( ) For details on isSelected( ) and setSelected( ), see Create a Toggle Button
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The following example reworks the check box example in the previous recipe so that it uses radio buttons
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// Demonstrate Radio Buttons import javaawt*; import javaawtevent*; import javaxswing*; class RBDemo implements ActionListener { JLabel jlabTranslateTo; JLabel jlabWhat; JLabel jlabChange; JCheckBox jcbTranslate; JRadioButton jrbFrench; JRadioButton jrbGerman; JRadioButton jrbChinese; ButtonGroup bg; RBDemo() { // Create a new JFrame container JFrame jfrm = new JFrame("Radio Button Demo"); // Specify a 1 column, 7 row grid layout jfrmsetLayout(new GridLayout(7, 1));
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// Give the frame an initial size jfrmsetSize(260, 160); // Terminate the program when the user closes the application jfrmsetDefaultCloseOperation(JFrameEXIT_ON_CLOSE); // Create labels jlabTranslateTo = new JLabel("Translate To:"); jlabChange = new JLabel(""); jlabWhat = new JLabel("Translate into French"); // Make a check box jcbTranslate = new JCheckBox("Translate"); // Create the button group bg = new ButtonGroup(); // Create the radio buttons Select the first one jrbFrench = new JRadioButton("French", true); jrbGerman = new JRadioButton("German"); jrbChinese = new JRadioButton("Chinese"); // Add the radio buttons to the group bgadd(jrbFrench); bgadd(jrbGerman); bgadd(jrbChinese); // Initially disable the language buttons and // the Translate To label jlabTranslateTosetEnabled(false); jlabWhatsetEnabled(false); jrbFrenchsetEnabled(false); jrbGermansetEnabled(false); jrbChinesesetEnabled(false); // Add item listener for jcbTranslate jcbTranslateaddItemListener(new ItemListener() { // Change the enabled/disabled state of // the language radio buttons and related labels // Also, report the state ofjcbTranslate public void itemStateChanged(ItemEvent ie) { if(jcbTranslateisSelected()) { jlabTranslateTosetEnabled(true); jrbFrenchsetEnabled(true); jrbGermansetEnabled(true); jrbChinesesetEnabled(true); jlabWhatsetEnabled(true); jlabChangesetText("Translation enabled"); } else { jlabTranslateTosetEnabled(false);
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