Java 如果ButtonGroup的所有JRadioButtons都是在一个循环中创建的，那么如何为该ButtonGroup设置Selected？

对于我的

难度
中的每个值，我为
按钮组
的
循环创建
JRadioButton
提供了以下
功能：

private enum Difficulty {
    EASY("Easy"),
    MEDIUM("Medium"),
    HARD("Hard"),
    EXTRA_HARD("Extra Hard");

    public final String name;

    private Difficulty(String name) {
        this.name = name;
    }
}

for (Difficulty diff : Difficulty.values()) {
    JRadioButton radDiff = new JRadioButton(diff.name);
    radDiff.setActionCommand(diff.name);
    btgrpDiff.add(radDiff);
    panDiff.add(radDiff, "align 50%, shrink 2, wrap");
}

如何在
for
循环的
之外为
按钮组
btgrpDiff
设置选中的
？我想在它们全部被选中后直接设置，或者在枚举中为每个难度级别设置一个布尔参数，以确定它们是否在
for
循环中被设置为选中，但我不确定哪一个是最好的，或者如何准确获取
JRadioButton
s的
ButtonModel
。
创建按钮后，将按钮放入ArrayList

作为类变量，您应该

ArrayList<JRadioButton> mylist = new ArrayList<JRadioButton>()

然后，您可以随时使用mylist访问它们。获取（i）
或将它们放在地图中，然后您可以直接获取它们：

Map<Difficulty,JRadioButton> rButtons = new HashMap<Difficulty,JRadioButton>();

for (Difficulty diff : Difficulty.values()) {
  JRadioButton radDiff = new JRadioButton(diff.name);
  rButtons.put(diff,radDiff);
  btgrpDiff.add(radDiff);
...
}

Map rButtons=newhashmap（）；
for（难度差：难度值（））{
JRadioButton radDiff=新的JRadioButton（diff.name）；
rButtons.put（diff，radDiff）；
btgrpDiff.add（radDiff）；
...
}
创建时将它们放入列表中，然后您可以在列表中迭代，并在所有需要的按钮上运行该方法
Map<Difficulty,JRadioButton> rButtons = new HashMap<Difficulty,JRadioButton>();

for (Difficulty diff : Difficulty.values()) {
  JRadioButton radDiff = new JRadioButton(diff.name);
  rButtons.put(diff,radDiff);
  btgrpDiff.add(radDiff);
...
}