Java线程实现时间动态显示

import javax.swing.*;
import java.awt.*;
import java.util.Date;


public class Test1 {
    public static void main(String[] args) {
        JFrame frame = new JFrame("我的窗口");
        frame.setBounds(200,200,400,400);
        JTextField textField=new JTextField();
        frame.add(textField);
        new Thread(new Runnable() {
            @Override
            public void run() {
                while(true){
                    try {
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    Date date=new Date();
                    textField.setText(date.getHours()+":"+date.getMinutes()+":"+date.getSeconds());
                    textField.setFont(new Font("楷体",Font.BOLD,20));
                }
            }
        }).start();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
    }
}