为什么这个计时器不适用于 actionListener？

Question

I want to create a program where each second it prints "tick" to the console. I want to do this using the ActionListener interface. I created a timer object with a delay of 1000 milli-seconds.

This approach with ActionListener and Timer worked in other projects, but it doesn't here.

I will appreciate it if someone could help me.

package mainPackage;
import javax.swing.*;
import javax.swing.Timer;
import java.awt.*;
import java.awt.event.*;

public class Game extends Canvas implements ActionListener {
    
    Timer timer;
    
    public Game() {
        timer = new Timer(1000, this);
        timer.start();
    }
    
    @Override
    public void actionPerformed(ActionEvent e) {
        System.out.println("Tick");
    }
    
    public static void main(String[] args) {
        new Game();
    }

}

I am new to java, so I am sorry if this is a stupid question!

Thanks in advance!

Answer 1

I presume the problem is that your program is finishing immediately. The swing Timer does not prevent your program from ending. Try displaying a swing component. Your program should continue, and the timer run, while the component is visible.

Alternatively you could use java.util.Timer instead of javax.swing.Timer . The util Timer can create non-deamon threads , which should keep your program alive.