从 ButtonGroup 中获取所有 JRadioButton

Question

如果我们认为我有一个 ButtonGroup 组件，它有两个 JRadioButton 像这样：

JRadioButton bButton = new JRadioButton("Boy");
JRadioButton gButton = new JRadioButton("Girl");
ButtonGroup group = new ButtonGroup();

bButton.setSelected(true);

group.add(bButton);
group.add(gButton);

如何从ButtonGroup 中获取所有JRadioButton 组件按默认顺序排序，以便我可以设置第一个JRadioButton Selected？

Answer 1

终于找到了解决办法，我觉得有办法返回Enumeration<AbstractButton>，所以用它来返回这个ButtonGroup的所有JRadioButton

//Convert Enumeration to a List
List<AbstractButton> listRadioButton = Collections.list(group.getElements());

//show the list of JRadioButton
for (AbstractButton button : listRadioButton) {
    System.out.println("Next element : " + ((JRadioButton) button).getText());
    System.out.println("Is selectd = " + button.isSelected());
}

//Set the first JRadioButton selected
if(listRadioButton.size() > 0){
    listRadioButton.get(0).setSelected(true);
}