ThreadTest4.java

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class ThreadTest4 {

  public static void main(String[] args) {

    System.out.println("Entering main");

    ExecutorService exec = Executors.newFixedThreadPool(4);

		for (int i = 0; i < 10; i++) {
			exec.execute(new Runnable() {
				public void run() {
					try {
						System.out.println("Hello! - " + Thread.currentThread().getId());
						Thread.sleep(1 * 3000);
					} catch (InterruptedException e) {
						e.printStackTrace();
					}
				}
			});
		}

		System.out.println("Exit main");
  }
}