`handle` is now a `JoinHandle`. What do we do with it? We use a method called `.join()`. This method means "wait until all the threads are done" (it waits for the threads to join it). So now just write `handle.join()` and it will wait for every of the threads to finish.
`handle` is now a `JoinHandle`. What do we do with it? We use a method called `.join()`. This method means "wait until all the threads are done" (it waits for the threads to join it). So now just write `handle.join()` and it will wait for each of the threads to finish.