Java：优化while（true）循环[重复]

Question

我正在创建一个获取时间并将其显示在 JFrame 中的程序（它还将背景更新为颜色 #[HOUR][MIN][SEC]，如 on rhysperry.co.nf ）。我的问题是定时器接缝仅每 2-4 秒更新一次（在低端机器上）。我有代码，想知道如何优化一个已经很小的程序。

由于我还没有完全理解 Java，请容忍不良的编码习惯。

这是我的代码 - Window.java：

import javax.swing.*;
import java.awt.*;
import java.io.IOException;
import java.io.InputStream;
import java.util.Calendar;
import java.util.concurrent.TimeUnit;


public class Window {
    /**
     * Simple color changing clock based on the website the website <a href="http://rhysperry.co.nf">rhysperry.co.nf</a>
     *
     * @author Rhys Perry
     */
    public static void main(String[] args) throws IOException, FontFormatException, InterruptedException {

        //Import font
        InputStream in = Window.class.getResourceAsStream("Lato-Hairline.ttf");
        Font font = Font.createFont(Font.TRUETYPE_FONT, in).deriveFont(50f);

        //Initialise the Frame, Panel and label
        JFrame frame= new JFrame("Hex Clock");

        JPanel panel = new JPanel();
        panel.setLayout(new FlowLayout());

        JLabel label = new JLabel();
        label.setFont(font);
        label.setPreferredSize(new Dimension(200, 350));
        label.setForeground(Color.WHITE);

        //Merge Frame, Panel and "This is a test")Label. Make window visible
        panel.add(label);
        frame.add(panel);
        frame.setSize(700, 400);
        frame.setLocationRelativeTo(null);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setVisible(true);
        //Setup calendar
        Calendar calendar;

        //Initialise some variables to do with time management
        String formattedhour;
        String formattedmin;
        String formattedsec;

        //Main loop to get the time and update the background ad Label
        while(true) {
            //Get hours, minutes and seconds
            calendar = Calendar.getInstance();
            int hour = calendar.get(Calendar.HOUR_OF_DAY);
            if (hour < 10) { formattedhour = "0" + hour; } else { formattedhour = hour + "";}
            int min = calendar.get(Calendar.MINUTE);
            if (min < 10) { formattedmin = "0" + min; } else { formattedmin = min + "";}
            int sec = calendar.get(Calendar.SECOND);
            if (sec < 10) { formattedsec = "0" + sec; } else { formattedsec = sec + "";}

            //Format and update the necessary components
            String time = formattedhour + ":" + formattedmin + " " + formattedsec;
            label.setText(time);
            String hex = "#" + formattedhour + formattedmin + formattedsec;
            panel.setBackground(Color.decode(hex));
            panel.repaint();
        }

    }

}

Answer 1

您可以改用 javax.swing.Timmer。它在时间间隔后重复执行任务。 https://docs.oracle.com/javase/7/docs/api/javax/swing/Timer.html

   ActionListener taskPerformer = new ActionListener() {
        public void actionPerformed(ActionEvent evt) {
            //...Perform a task...

        }
    };
    Timer timer = new Timer(10 ,taskPerformer);
    timer.start();