about array Thread

[thangbomlennet]

exp, i create array nameThread tpye class DownloadThread

DownloadThread[] nameThread = new DownloadThread[100];
for(int i=0;i<100;i++)
nameThread[i] = new DownloadThread(strUrl);

now,I don't know ..how to know all Threads run finished.
plz help me.

[neilcoffey]

You can use the CountDownLatch class. The idea is that you create a CountDownLatch with the number of threads you'll have, then waiting on this latch (note "await", not "wait"!):

CountDownLatch latch = new CountDownLatch(100);
// ... create threads, passing them 'latch', and start them
latch.await();

Then, each thread ends by counting down the latch:

// thread's run method
public void run() {
  try {
    // ... do exciting thing
  } finally {
    latch.countDown();
  }
}