我设定了三个JRadioButton和一个ButtonGroup，我想在改变单选按钮时在控制台输出按钮名字，我应该这么写

您可以在每个 JRadioButton 对象上添加状态更改侦听器，然后从侦听器中获取按钮的名称并输出到控制台。示例代码如下：

JRadioButton radioButton1 = new JRadioButton("Button 1");
JRadioButton radioButton2 = new JRadioButton("Button 2");
JRadioButton radioButton3 = new JRadioButton("Button 3");

ButtonGroup buttonGroup = new ButtonGroup();
buttonGroup.add(radioButton1);
buttonGroup.add(radioButton2);
buttonGroup.add(radioButton3);

radioButton1.addChangeListener(new ChangeListener() {
    public void stateChanged(ChangeEvent e) {
        if (radioButton1.isSelected()) {
            System.out.println("Selected: " + radioButton1.getText());
        }
    }
});

radioButton2.addChangeListener(new ChangeListener() {
    public void stateChanged(ChangeEvent e) {
        if (radioButton2.isSelected()) {
            System.out.println("Selected: " + radioButton2.getText());
        }
    }
});

radioButton3.addChangeListener(new ChangeListener() {
    public void stateChanged(ChangeEvent e) {
        if (radioButton3.isSelected()) {
            System.out.println("Selected: " + radioButton3.getText());
        }
    }
});

当单选按钮状态更改时，会调用相应的 ChangeListener，并检查选中的按钮是否是当前按钮，如果是，则将按钮的名称输出到控制台。