e768. 创建单选按钮

// Create an action for each radio button
    Action action1 = new AbstractAction("RadioButton Label1") {
        // This method is called whenever the radio button is pressed,
        // even if it is already selected; this method is not called
        // if the radio button was selected programmatically
        public void actionPerformed(ActionEvent evt) {
            // Perform action
        }
    };
    Action action2 = new AbstractAction("RadioButton Label2") {
        // See above
        public void actionPerformed(ActionEvent evt) {
            // Perform action
        }
    };

    // Create the radio buttons using the actions
    JRadioButton b1 = new JRadioButton(action1);
    JRadioButton b2 = new JRadioButton(action2);

    // Associate the two buttons with a button group
    ButtonGroup group = new ButtonGroup();
    group.add(b1);
    group.add(b2);

    // Neither radio button is selected; to select a radio button,
    // see e769 在按钮组中选择一个单选按钮

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