Java带图像化界面的倒计时程序

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import javax.swing.*;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.concurrent.ScheduledThreadPoolExecutor;
import java.util.concurrent.TimeUnit;

/**
 * 倒计时
 */
public class Counter {
 
    private JFrame frame;
    private JLabel jl0;
 
    private ScheduledThreadPoolExecutor scheduled;
 
    public static void main(String[] args) {
        new Counter().timer("2020-02-22 00:00:00");
 
    }
 
    /* String -> Date */
    private Date String2Date(String dateStr) {
        SimpleDateFormat simpleDateFormat = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
        try {
            Date date = simpleDateFormat.parse(dateStr);
            if (date.getTime() <= System.currentTimeMillis()) {
                jl0.setText("时间不能早于现在" + dateStr);
                throw new IllegalArgumentException("时间不能早于现在" + dateStr);
            }
            return date;
        } catch (ParseException e) {
            jl0.setText("时间格式传入错误,如yyyy-MM-dd HH:mm:ss，" + dateStr);
            throw new IllegalArgumentException("时间格式传入错误,如yyyy-MM-dd HH:mm:ss，" + dateStr);
        }
    }
 
 
    /* 倒计时的主要代码块 */
    public void timer(String dateStr) {
        Date end = String2Date(dateStr);
        scheduled.scheduleAtFixedRate(new Runnable() {
            @Override
            public void run() {
                long time = (end.getTime() - 1 - System.currentTimeMillis()) / 1000;
                if (time <= 0) {
                    stopTimer();
                    jl0.setText("到达指定时间点" + dateStr);
                    return;
                }
                long hour = time / 3600;
                long day=hour / 24;
                long minute = (time - hour * 3600) / 60;
                long seconds = time - hour * 3600 - minute * 60;
                StringBuilder stringBuilder = new StringBuilder();
                stringBuilder.append("<html>" +
                        "<h1 style=\"text-align:center\">倒计时</h1><br>" +
                        "<h2 style=\"text-align:center\">")
                        .append(day).append("天 ").append(hour- 24*day).append("时 ").append(minute).append("分 ").append(seconds).append("秒 ")
                        .append("</h2></html>");
 
                jl0.setText(stringBuilder.toString());
            }
        }, 0, 1, TimeUnit.SECONDS);
 
    }
 
    /**
     * 停止定时器
     */
    private void stopTimer() {
        if (scheduled != null) {
            scheduled.shutdownNow();
            scheduled = null;
        }
    }
 
    /* 构造 实现界面的开发 GUI */
    public Counter() {
        scheduled = new ScheduledThreadPoolExecutor(2);
        init();
    }
 
    /* 组件的装配 */
    private void init() {
        frame = new JFrame("XXXXX");
        jl0 = new JLabel();
 
        JPanel jp = new JPanel();
        jp.add(jl0);
 
        frame.add(jp);
 
        frame.setVisible(true);
        frame.setLocation(630, 280);
        frame.setSize(400, 300);
        frame.setResizable(false);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
 
}
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