package concurrent;

import java.util.*;
import java.util.concurrent.*;
import java.text.SimpleDateFormat;

class ThreadLocalTask implements Runnable {
	private ThreadLocal<String> startDate = new ThreadLocal<String>() {
		protected String initialValue() {
			SimpleDateFormat sdf = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss");
			return sdf.format(new Date());
		}
	};
	
	public void run() {
		String id = String.format("%04d", Thread.currentThread().getId());
		System.out.println("Thread " + id + " created at " + startDate.get() + " starts");
	}
}

public class ThreadLocalDemo {
	public static void main(String[] args) throws Exception {
		ThreadLocalTask task = new ThreadLocalTask();
		for (int idx = 0; idx < 10; idx++) {
			Thread thread = new Thread(task);
			thread.start();
			TimeUnit.SECONDS.sleep(1);
		}
		TimeUnit.SECONDS.sleep(2);
	}
}