是否选择了活动选项卡式收音机？

Question

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

public class TabbedPaneExample {
JFrame f;
TabbedPaneExample(){
f=new JFrame();

    JButton check = new JButton("Check state of RadioButton");
    check.setBounds(50,280,200,60);
    //selected tabbed radio button is selected ?

    JPanel p1=new JPanel();
    JPanel p2=new JPanel();
    JPanel p3=new JPanel();
    JRadioButton rb1 = new JRadioButton("Radio");
    JRadioButton rb2= new JRadioButton("Radio");
    JRadioButton rb3 = new JRadioButton("Radio");
    rb1.setBounds(150,170,80,100);
    rb2.setBounds(150,170,80,100);
    rb3.setBounds(150,170,80,100);
    p1.add(rb1);
    p2.add(rb2);
    p3.add(rb3);
    JTabbedPane tp=new JTabbedPane();
    tp.setBounds(50,50,200,200);
    tp.add("main",p1);
    tp.add("visit",p2);
    tp.add("help",p3);

    check.addActionListener(new ActionListener() {
        @Override
        public void actionPerformed(ActionEvent e) {
            
            // Q: is the radio button of the selected tab is checked
            // what is the logic i can put here to get result
            // show result into JOptionPane
        }
    });


    f.add(tp);
    f.add(check);
    f.setSize(400,400);
    f.setLayout(null);
    f.setVisible(true);
}
public static void main(String[] args) {
    new TabbedPaneExample();

}}

问：显示活动选项卡的单选按钮状态（选中或未选中）：

我有三个选项卡，这些选项卡有单选按钮，我想获取状态（选择或相对于任何活动选项卡的单选按钮！