Java如何设置Swing Timer的初始延迟？
javax.swing.Timer在构造函数中指定的延迟时间过去之后，Swing对象将触发action事件。由于某些原因，您可能希望Timer该类在启动后立即触发。
为此，您可以通过调用setInitialDelay(intinitialDelay)方法来设置计时器的初始延迟。下面的示例为您提供了一个示例。
package org.nhooo.example.swing;
import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
public class TimerInitialDelayDemo extends JFrame {
private JLabel counterLabel = new JLabel();
private Timer timer = null;
public TimerInitialDelayDemo() throws HeadlessException {
initUI();
}
private void initUI() {
setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
setSize(200, 200);
Container container = getContentPane();
container.setLayout(new FlowLayout(FlowLayout.CENTER));
container.add(counterLabel);
timer = new Timer(1000, new MyActionListener());
//设置Timer对象的初始延迟。设置初始延迟
//为零会导致计时器在触发后立即触发事件
//它开始了。
timer.setInitialDelay(0);
timer.start();
}
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
new TimerInitialDelayDemo().setVisible(true);
}
});
}
class MyActionListener implements ActionListener {
private int counter = 10;
public void actionPerformed(ActionEvent e) {
counter = counter - 1;
String text = "<html><font size=\"14\">" +
String.valueOf(counter) +
"</font></head>";
counterLabel.setText(text);
if (counter == 0) {
timer.stop();
}
}
}
}