java – 我不知道如何在停止时显示计时器
内容导读
互联网集市收集整理的这篇技术教程文章主要介绍了java – 我不知道如何在停止时显示计时器，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含5679字，纯文字阅读大概需要9分钟。
内容图文
你们都还好吗？我的代码有点问题.当我停止我的计时器程序时,它会说“完成！”因为我将它设置为“完成”,但我想显示剩余时间而不是“完成”一词.例如,如果我原始时间设置是4000秒并且我在3000秒停止,我想显示当前时间,即停止时的3000而不是单词“完成”.你能帮助我吗？我真的很感激.
这是我的代码：
import java.awt.event.*;
import java.awt.*;
import javax.swing.*;
public class CountdownTimer extends JFrame {
JLabel promptLabel, timerLabel;
int counter;
JLabel tf;
JButton button;
Timer timer;
public static void main(String args[]) {
SwingUtilities.invokeLater(new Runnable() {
@Override
public void run() {
new CountdownTimer();
}
});
}
public CountdownTimer() {
JFrame lt = new JFrame();
lt.getContentPane().setBackground(new Color(0, 102, 153));
lt.setBounds(100, 100, 450, 300);
lt.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
lt.getContentPane().setLayout(null);
lt.setVisible(true);
promptLabel = new JLabel("Time: ", SwingConstants.CENTER);
promptLabel.setFont(new Font("Modern No. 20", Font.BOLD, 17));
promptLabel.setBounds(21, 30, 210, 30);
lt.add(promptLabel);
tf = new JLabel("4000");
tf.setBounds(160, 36, 40, 20);
lt.add(tf);
button = new JButton("Start");
button.setFont(new Font("Modern No. 20", Font.BOLD, 11));
button.setBounds(299, 37, 89, 23);
lt.add(button);
JButton btnLogout = new JButton("LOGOUT");
btnLogout.setBackground(new Color(112, 128, 144));
btnLogout.setFont(new Font("Trajan Pro", Font.BOLD, 17));
btnLogout.setBounds(149, 189, 121, 36);
btnLogout.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
String sbutt = e.getActionCommand();
if(sbutt.equals("LOGOUT")) {
long current = counter;
long elapsed = current - counter;
timer.stop();
timerLabel.setText("Done!");
Toolkit.getDefaultToolkit().beep();
tf.setText(String.valueOf(elapsed));
}
}
});
lt.getContentPane().add(btnLogout);
timerLabel = new JLabel("Waiting...", SwingConstants.CENTER);
timerLabel.setFont(new Font("Modern No. 20", Font.BOLD, 17));
timerLabel.setBounds(119, 97, 176, 62);
lt.getContentPane().add(timerLabel);
event e = new event();
button.addActionListener(e);
}
public void actionPerformed(ActionEvent e) {
throw new UnsupportedOperationException("Not supported yet.");
}
public void run() {
throw new UnsupportedOperationException("Not supported yet.");
}
public class event implements ActionListener {
public void actionPerformed(ActionEvent e) {
int count = (int)(Double.parseDouble(tf.getText()));
timerLabel.setText("Time left: " + count);
TimeClass tc = new TimeClass(count);
timer = new Timer(1000, tc);
timer.start();
}
}
public class TimeClass implements ActionListener {
int counter;
public TimeClass(int counter) {
this.counter= counter;
}
public void actionPerformed(ActionEvent tc) {
counter--;
if(counter >= 1) {
timerLabel.setText("Time left: " + counter);
}
else {
timer.stop();
timerLabel.setText("Done!");
Toolkit.getDefaultToolkit().beep();
}
}
}
}
解决方法:
but I would like to display the remaining time instead of the word “Done”.
更改timerLabel.setText(“完成！”); to timerLabel.setText(counter);?
我应该指出,由于它的性质,Swing Timer并不完全准确,你应该关注已经过去的时间量而不是调用定时器的频率.这当然完全取决于你想要计数的准确程度,但值得了解(恕我直言)
import java.awt.Dimension;
import java.awt.EventQueue;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.UIManager;
import javax.swing.UnsupportedLookAndFeelException;
public class Test {
public static void main(String[] args) {
new Test();
}
public Test() {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
try {
UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
} catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {
ex.printStackTrace();
}
JFrame frame = new JFrame("Testing");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TestPane());
frame.pack();
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
});
}
public static class TestPane extends JPanel {
private JLabel label;
private JButton button;
private Timer timer;
private long startedAt;
public static final int RUN_TIME = 5000;
public TestPane() {
label = new JLabel("...");
button = new JButton("Start");
setLayout(new GridBagLayout());
GridBagConstraints gbc = new GridBagConstraints();
gbc.gridwidth = GridBagConstraints.REMAINDER;
add(label, gbc);
add(button, gbc);
button.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
if (timer == null) {
button.setText("Stop");
startedAt = System.currentTimeMillis();
timer = new Timer(500, new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
long diff = System.currentTimeMillis() - startedAt;
if (diff >= RUN_TIME) {
label.setText("Out of time; Used: " + remainingTime() + "s; remaining " + usedTime() + "s");
timer.stop();
button.setText("Start");
} else {
label.setText("Used: " + remainingTime() + "s; remaining " + usedTime() + "s");
}
}
});
label.setText("Used: " + remainingTime() + "s; remaining " + usedTime() + "s");
timer.start();
} else {
timer.stop();
long diff = System.currentTimeMillis() - startedAt;
label.setText("Used: " + remainingTime() + "s; remaining " + usedTime() + "s");
button.setText("Start");
timer = null;
}
}
});
}
public int remainingTime() {
long diff = System.currentTimeMillis() - startedAt;
return (int) Math.round((RUN_TIME - diff) / 1000d);
}
public int usedTime() {
long diff = System.currentTimeMillis() - startedAt;
return (int) Math.round(diff / 1000d);
}
@Override
public Dimension getPreferredSize() {
return new Dimension(300, 200);
}
}
}
内容总结
以上是互联网集市为您收集整理的java – 我不知道如何在停止时显示计时器全部内容，希望文章能够帮你解决java – 我不知道如何在停止时显示计时器所遇到的程序开发问题。 如果觉得互联网集市技术教程内容还不错，欢迎将互联网集市网站推荐给程序员好友。
内容备注
版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 gblab@vip.qq.com 举报，一经查实，本站将立刻删除。
内容手机端
扫描二维码推送至手机访问。
来源：【匿名】