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import java.util.ArrayList;
import java.util.List;
public class MultipleThreadsDemo {
public static void main(String[] args) {
// We will store the threads so that we can check if they are done
List<Thread> threads = new ArrayList<>();
// We will create 50 threads
for (int i = 0; i < 50; i++) {
Runnable task = new FindSumOfNumbers(10000000L + i);
// ? Identify the Java concepts used in the above line
Thread worker = new Thread(task);
// We can set the name of the thread
worker.setName(String.valueOf(i));
// Start the thread, never call method run() direct
worker.start();
// Remember the thread for later usage
threads.add(worker);
}
int running = 0;
do {
running = 0;
for (Thread thread : threads) {
if (thread.isAlive()) {
running++;
}
}
System.out.println("We have " + running + " running threads. ");
} while (running > 0);
}
}
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