BackgroundTimePrintTask.java

package br.com.leonardoz.patterns.task_cancel;

import java.text.SimpleDateFormat;
import java.util.Date;

/**
 * Pattern: Thread Task Cancel
 *
 * Example: Canceling a Background Timer Print Task.
 * 
 */
public class BackgroundTimePrintTask {

	private Thread thread;
	private Runnable task = () -> {
		while (!Thread.currentThread().isInterrupted()) {
			var date = new Date(System.currentTimeMillis());
			System.out.println(new SimpleDateFormat().format(date));
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				// no need to interrupt() if you don't have anything throwing InterruptedException
				thread.interrupt();
			}
		}
	};

	public void run() {
		thread = new Thread(task);
		thread.start();
	}

	public void cancel() {
		if (thread != null) {
			thread.interrupt();
		}
	}

	public static void main(String[] args) {
		var self = new BackgroundTimePrintTask();
		self.run();
		try {
			Thread.sleep(4000);
		} catch (InterruptedException e) {
			e.printStackTrace();
		}
		self.cancel();
	}
}