Ошибка в программе Illegal static declaration in inner class Quiz.lb

import java.util.Scanner;
 
import java.awt.*;
import java.awt.event.*;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
 
class   Quiz extends Frame {
    CheckboxGroup groupbox = new CheckboxGroup();
    Checkbox chkReading = new Checkbox("Reading", groupbox, false);
    Checkbox chkMusic = new Checkbox("Music", groupbox, false);
    Checkbox chkPainting = new Checkbox("Painting", groupbox, false);
    Checkbox chkMovies = new Checkbox("Movies", groupbox, false);
 
    Label lbl = new Label("What,s you hobby?");
 
    public Quiz (String s) {
        super(s);
        setLayout(new GridLayout(5,1));
        add(lbl);
        add(chkReading);
        add(chkMusic);
        add(chkPainting);
        add(chkMovies);
 
        addWindowListener(new  WindowAdapter() {
            public void windowClosing (WindowEvent we) {
                setVisible(false);
                System.exit(0);
            }
        });
    }
 public class lb{
    public static void main(String[] args) {
        Quiz objHobbiesRadio = new Quiz("a basket full of checkboxes");
        objHobbiesRadio.setSize(400, 400);
        objHobbiesRadio.setVisible(true);
 
    }
}
}