java - 将所选选项与一组单选按钮中的正确答案进行比较

Question

如何从一组单选按钮中获取所选选项。有哪些可能的方法来检查所选选项的正确答案？(我是初学者)这是正在处理的代码。仅包含 2 个问题，每个问题有 4 个单选按钮，它们已分组。现在我必须在检查正确答案后显示分数

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;

public class MyRadioButton {

    private JFrame frame = new JFrame("RadioRadio");
    private JLabel timerl = new JLabel("Press Button to start");
    private JPanel butp = new JPanel();
    private JPanel panel1=new JPanel();
    private JLabel q1=new JLabel("Qn 1:Who is the first President Of India?");
    private JLabel q2=new JLabel("Qn 2:Who is the first Prime Minister Of India?");

    private JPanel panel2=new JPanel();
    private JPanel panel3=new JPanel();
    private JLabel label=new JLabel();
    private JButton button = new JButton("Start Exam");
    private JRadioButton rd1=new JRadioButton("a)Nehru");
    private JRadioButton rd2=new JRadioButton("b)R.Prasad");
    private JRadioButton rd3=new JRadioButton("c)S.R.Krishnan");
    private JRadioButton rd4=new JRadioButton("d)GV.Mavlankar"); 
    private JRadioButton rd5=new JRadioButton("a)Nehru");
    private JRadioButton rd6=new JRadioButton("b)R.Prasad");
    private JRadioButton rd7=new JRadioButton("c)S.R.Krishnan");
    private JRadioButton rd8=new JRadioButton("d)GV.Mavlankar"); 

    ButtonGroup group1 = new ButtonGroup();
    ButtonGroup group2 = new ButtonGroup();

    public int result=0;
    private Timer mytimer;
    private String ss = "Time Remaining %02d Seconds!";
    private int elapsedSeconds = 0;
    private int total = 60;
    JLayeredPane pane=new JLayeredPane();


    public MyRadioButton() {
        button.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {


                if (mytimer != null && mytimer.isRunning()) {
                    //String t = String.format("Result:Your Score is %d", result);
                   //label.setText(t); 
                    mytimer.stop();
                    elapsedSeconds = 0;
                    timerl.setText("Exam Terminated");
                } else {
                    panel1.setBounds(0, 100, 500, 100);
                    panel1.add(q1);
                    pane.add(panel1,pane.DEFAULT_LAYER);
                    panel2.setBounds(0,200,500,100);
                    panel2.add(q2);
                    pane.add(panel2,pane.DEFAULT_LAYER);
                    panel3.setBounds(0, 300, 500, 100);
                    pane.add(panel3,pane.DEFAULT_LAYER);
                    panel3.add(label);


                   panel1.add(rd1);
                   panel1.add(rd2);
                   panel1.add(rd3);
                   panel1.add(rd4);
                   panel2.add(rd5);
                   panel2.add(rd6);
                   panel2.add(rd7);
                   panel2.add(rd8);
                   group1.add(rd1);
                   group1.add(rd2);
                   group1.add(rd3);
                   group1.add(rd4);
                   group2.add(rd5);
                   group2.add(rd6);
                   group2.add(rd7);
                   group2.add(rd8);
                    mytimer = new Timer(1000, new TimerListener());
                    mytimer.start();
                    String t = String.format(ss, total);
                    timerl.setText(t);

                }
            }
        });

        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(500,500);
        frame.add(pane);
        butp.setBounds(0,0,500,100);
        butp.add(button);
        butp.add(timerl);
        pane.add(butp,pane.DEFAULT_LAYER);
       frame.setVisible(true);
    }

    private class TimerListener implements ActionListener {

        public void actionPerformed(ActionEvent e) {
            elapsedSeconds++;
            if (elapsedSeconds == total) {
                mytimer.stop();
                elapsedSeconds = 0;
                timerl.setText("Time Up");
            } else {
                String t = String.format(ss, total - elapsedSeconds);
                timerl.setText(t);
            }
        }
    }

    public static void main(String args[]) {
        java.awt.EventQueue.invokeLater(new Runnable() {
            public void run() {
                MyRadioButton r = new MyRadioButton();

            }
        });
    }
}

Answer 1

您可以向每个按钮添加一个 ActionListener，您可以在其中设置，例如，将类字段设置为当前选定的单选按钮值。

...
String firstAnswer;
String secondAnswer;
...

private FirstQuestionActionListener implements ActionListener
{
  public void actionPerformed(ActionEvent e) {
     firstAnswer = e.getActionCommand();
  }
}

private SecondQuestionActionListener implements ActionListener
{
  public void actionPerformed(ActionEvent e) {
     secondAnswer = e.getActionCommand();
  }
}

并以这种方式使用它:rb1.addActionListener(new FirstQuestionActionListener());