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[英]I'm running a function with a new timer every time I press a button; I don't know how to access the timer from a previous press
[英]I don't know how to display timer when stopped
你們都還好嗎? 我的代碼有一點問題。 當我停止計時器程序時,它會說“完成!”。 因為我將其設置為“完成”,但是我想顯示剩余時間而不是單詞“完成”。 例如,例如,如果我將原始時間設置為4000秒,並且我在3000秒處停止,那么我想在停止時顯示當前時間3000,而不是單詞“完成”。 你們能幫我嗎? 我真的很感激。
這是我的代碼:
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();
}
}
}
}
但我想顯示剩余時間而不是單詞“完成”。
更改timerLabel.setText("Done!");
到timerLabel.setText(counter);
?
我應該指出,由於它的本質,Swing Timer
並不完全准確,您應該關注已過去的時間量而不是計時器的調用頻率。 當然,這完全取決於您希望計數的准確度,但是值得一提(IMHO)
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);
}
}
}
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