JFrame(swing)用按钮切换重复动作

I want a JFrame application with 2 buttons (eventually more) that I can use to switch between multiple repeating actions, ofr simplicity I'm just using a console print for now, though it will probably be calling a method instead later. Here is the framework for the JFrame:

public class DayNight extends JFrame implements ActionListener{

    //JFrame entities
    private JPanel animationPanel;
    private JButton button;
    private JButton button2;


    public static void main(String[] args) {
        DayNight frame = new DayNight();
        frame.setSize(2000, 1300);
        frame.setLocation(1000,350);
        frame.createGUI();
        frame.setVisible(true);
        frame.setTitle("Day/Night Cycle, Rogier");
    }

   private void createGUI() {
    setDefaultCloseOperation(EXIT_ON_CLOSE);
    Container window = getContentPane();
    window.setLayout(new FlowLayout() );
    animationPanel = new JPanel();
    animationPanel.setPreferredSize(new Dimension(2000, 900));
    animationPanel.setBackground(Color.black);
    window.add(animationPanel);

    button = new JButton("choice1");
    button.setFont(new Font("Arial", Font.PLAIN, 50));
    window.add(button);
    button.setActionCommand("choice1");
    button.addActionListener(this);

    button2 = new JButton("choice2");
    button2.setFont(new Font("Arial", Font.PLAIN, 50));
    window.add(button2);
    button2.setActionCommand("choice2");
    button2.addActionListener(this);
   }
}

我尝试了以下方法:

public void actionPerformed(ActionEvent event) {
    String command = event.getActionCommand();
    while ("Stop"!=(command)){
        command = event.getActionCommand();
        try{
            Thread.sleep(500);
            if ("choice1".equals(command)){
                System.out.println("choice1");
            }
            else if("choice2".equals(command)){
                System.out.println("choice2");
            }
            else{
                System.out.println("no choice");
            }
        }   
        catch(InterruptedException ex){
            Thread.currentThread().interrupt();
        }

    }
}

但是在我单击一个按钮后，它一直停留在该打印件上，我什至无法再与这些按钮进行交互.我错过了什么还是我需要一个完全不同的结构?我检查了很多不同的程序，但它们对我来说太复杂了，我无法理解，阅读 Swing 中的并发也没有让我明白.

public void actionPerformed(ActionEvent event) {
   String command = event.getActionCommand();
   command = event.getActionCommand();
   Runnable printChoice = new Runnable() {
     @Override
     public void run() {
      try{
        Thread.sleep(500);
        if ("choice1".equals(command)){
            System.out.println("choice1");
        }
        else if("choice2".equals(command)){
            System.out.println("choice2");
        }
        else{
            System.out.println("no choice");
        }
      }   
      catch(InterruptedException ex){
        Thread.currentThread().interrupt();
      }
    });
    new Thread(printChoice).start();
}