Why Timer does not work if we do not generate a window?
- by Roman
Here is the code:
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.JFrame;
import javax.swing.Timer;
public class TimerSample {
public static void main(String args[]) {
new JFrame().setVisible(true);
ActionListener actionListener = new ActionListener() {
public void actionPerformed(ActionEvent actionEvent) {
System.out.println("Hello World Timer");
}
};
Timer timer = new Timer(500, actionListener);
timer.start();
}
}
It generates a window and then periodically prints "Hello World Timer" in the terminal (Command Prompt). If I comment this line new JFrame().setVisible(true); the application do not print anything to the command line. Why?
