您可以在每个上使用 setActionCommand（ + j）按钮，将每个按钮与其索引相关联，然后使用 bg.getSelection（）。getActionCommand（）获取任意组中所选按钮的索引。然后，您可以将一个ActionListener分配给一个组中的所有按钮，并确保操作侦听器知道它附加到了哪一行。

You could use setActionCommand("" + j) on each button to associate each button with its index, and then get the selected button's index in any group with bg.getSelection().getActionCommand(). You can then assign a single ActionListener to all the buttons in one group, and make sure the action listener knows which row it's attached to.

// in your "i" loop
final int row = i; // must be final to be used inside the anonymous class
final ButtonGroup btnG = bg;
final String answerAction = "" + ranNumber; // hard to tell if this is what you mean
ActionListener listener = new ActionListener() {
  public void actionPerformed(ActionEvent e) {
    System.out.println("row " + row);
    String selectedAction = btnG.getSelection().getActionCommand();
    System.out.println("btn " + selection);
    boolean isCorrectForThisRow = (answerAction == selectedAction);
    System.out.println("is correct: " + isCorrectForThisRow);
  }
};
// in your "j" loop, with either the answerLetter or k buttons
// as required
k.setActionCommand("" + j);
k.addActionListener(listener);

就目前而言，您的样本中有很多内容并不太有意义，因此很难提出更多建议（例如， while（true）循环在第一次迭代时就中断了）。但是应该使用 setActionCommand （此处的Oracle教程），以这种方式找出在按钮组中选中了哪个按钮。

As it stands, there is a lot to your sample that doesn't quite make sense, so it's hard to suggest more than this (for example - a while(true) loop that breaks on it's first iteration). But setActionCommand is meant to be used (oracle tutorial here) in exactly this way to find out which button is checked in a button group.