我正在制作游戏。我希望有一个类似时钟的东西，显示从游戏的乞讨过了多少时间。它工作得很好，但它可能比实际游戏开始晚一两秒。我不知道是什么原因，所以我很感激任何帮助。谢谢！
我创建了一个类似的情况（runnable）。
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.concurrent.TimeUnit;
import javax.swing.Timer;
public class GUI extends javax.swing.JFrame {
private Timer SimpleTimer;
public GUI() {
initComponents();
}
private void initComponents() {
jLabel1 = new javax.swing.JLabel();
jButton1 = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jButton1.setText("jButton1");
jButton1.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jButton1ActionPerformed(evt);
}
});
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(154, 154, 154)
.addComponent(jLabel1))
.addGroup(layout.createSequentialGroup()
.addGap(131, 131, 131)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 100, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(196, Short.MAX_VALUE))
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap(92, Short.MAX_VALUE)
.addComponent(jButton1, javax.swing.GroupLayout.PREFERRED_SIZE, 23, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGap(48, 48, 48)
.addComponent(jLabel1)
.addGap(137, 137, 137))
);
pack();
}
private void jButton1ActionPerformed(java.awt.event.ActionEvent evt) {
startGame();
}
public static void main(String args[]) {
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
new GUI().setVisible(true);
}
});
}
private javax.swing.JButton jButton1;
private javax.swing.JLabel jLabel1;
private void startGame() {
long startTime = System.currentTimeMillis();
if(SimpleTimer != null) {
SimpleTimer.stop();
}
SimpleTimer = new Timer(1000, new ActionListener(){
@Override
public void actionPerformed(ActionEvent e) {
long millis = System.currentTimeMillis() - startTime;
jLabel1.setText("Time passed: " + String.format("%02d:%02d:%02d", TimeUnit.MILLISECONDS.toHours(millis),
TimeUnit.MILLISECONDS.toMinutes(millis) - TimeUnit.HOURS.toMinutes(TimeUnit.MILLISECONDS.toHours(millis)),
TimeUnit.MILLISECONDS.toSeconds(millis) - TimeUnit.MINUTES.toSeconds(TimeUnit.MILLISECONDS.toMinutes(millis))));
}
});
SimpleTimer.start();
}
}
答案 0 :(得分：4)
你的时间计算了。不应该是这样的：
this.chartTitle = data.Name;
this.doughnutChartLabels[0] = data.Data.Issues[0].Values[0].Value;
this.doughnutChartLabels[1] = data.Data.Issues[1].Values[0].Value;
this.doughnutChartData[0] = data.Data.Issues[0].Values[2].Value;
this.doughnutChartData[1] = data.Data.Issues[1].Values[2].Value;
修改：不，您的转化没问题。我建议您的Timer使用更精细的粒度，然后1秒，如果您显示1秒单位。在这里，我使用100毫秒的粒度。
请注意，您的代码不会为我运行（请尝试复制并运行已发布的代码以查看其功能）。
请查看下面的MCVE应该是什么样子，然后复制并运行此代码以查看有效的计时器：
String text = String.format(TIME_FORMAT,
TimeUnit.MILLISECONDS.toHours(millis) % 24,
TimeUnit.MILLISECONDS.toMinutes(millis) % 60,
TimeUnit.MILLISECONDS.toSeconds(millis) % 60);
timerLabel.setText("Time passed: " + text);
编辑：没有NetBeans构建器垃圾的代码：
import java.awt.BorderLayout;
import java.awt.Dimension;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.util.concurrent.TimeUnit;
import javax.swing.*;
@SuppressWarnings("serial")
public class SimpleTimer extends JPanel {
private static final String TIME_FORMAT = "%02d:%02d:%02d";
public static final int TIMER_DELAY = 100;
private static final int PREF_W = 300;
private static final int PREF_H = 100;
private long startTime;
private Timer myTimer;
private JLabel timerLabel = new JLabel("00:00:00");
private JCheckBox fastChkBox = new JCheckBox("Run Artificially Fast", false);
public SimpleTimer() {
JPanel centerPanel = new JPanel(new GridBagLayout());
centerPanel.add(new JButton(new RestartAction("Restart", KeyEvent.VK_R)));
centerPanel.add(fastChkBox);
JPanel topPanel = new JPanel();
topPanel.add(new JLabel("Time passed: "));
topPanel.add(timerLabel);
setLayout(new BorderLayout());
add(topPanel, BorderLayout.PAGE_START);
add(centerPanel, BorderLayout.CENTER);
}
private class RestartAction extends AbstractAction {
public RestartAction(String name, int mnemonic) {
super(name);
putValue(MNEMONIC_KEY, mnemonic);
}
@Override
public void actionPerformed(ActionEvent e) {
if (myTimer != null && myTimer.isRunning()) {
myTimer.stop();
}
startTime = System.currentTimeMillis();
myTimer = new Timer(TIMER_DELAY, new TimerListener());
myTimer.start();
}
}
// make it bigger
@Override
public Dimension getPreferredSize() {
Dimension superSz = super.getPreferredSize();
if (isPreferredSizeSet()) {
return superSz;
}
int prefW = Math.max(superSz.width, PREF_W);
int prefH = Math.max(superSz.height, PREF_H);
return new Dimension(prefW, prefH);
}
private class TimerListener implements ActionListener {
@Override
public void actionPerformed(ActionEvent e) {
long millis = System.currentTimeMillis() - startTime;
if (fastChkBox.isSelected()) {
millis *= 512; // make time go faster
}
String text = String.format(TIME_FORMAT,
TimeUnit.MILLISECONDS.toHours(millis) % 24,
TimeUnit.MILLISECONDS.toMinutes(millis) % 60,
TimeUnit.MILLISECONDS.toSeconds(millis) % 60);
timerLabel.setText(text);
}
}
private static void createAndShowGui() {
SimpleTimer mainPanel = new SimpleTimer();
JFrame frame = new JFrame("SimpleTimer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(mainPanel);
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static void main(String[] args) {
SwingUtilities.invokeLater(() -> createAndShowGui());
}
}