Executors

import java.util.concurrent.ExecutorService;

import java.util.concurrent.Executors;

 

public class CachedThreadPool {

    public static void main(String[] args) {

       ExecutorService exec = Executors.newCachedThreadPool();

       for (int i = 0; i < 5; i++)

           exec.execute(new MyThread(i));

       exec.shutdown();

    }

}