A simple java class demonstrating how to use a Java Timer

TimerTask.java

import java.util.Timer;
import java.util.TimerTask;

public class Main {
    public static void main(String[] args) {
        // Instantiate new timer
        Timer timer = new Timer(true);

        System.out.println("Timer started!");
        // Schedule a timer for every second
        // Declare anonymous TimerTask
        timer.scheduleAtFixedRate(new TimerTask() {
            @Override
            public void run() {
                System.out.println("Timer!");
            }
        }, 0, 1000);

        // Sleep thread for 20 seconds
        try {
            Thread.sleep(20000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

        // Cancel timer after 20 seconds
        timer.cancel();
        System.out.println("Timer stopped!");
    }
}