public static void main(String[] args) throws InterruptedException {
System.setOut(
new PrintStream(
new OutputStream() {
@Override
public void write(int b) throws IOException {}
}));
long start = System.nanoTime();
List<Thread> threads = new ArrayList<>();
ThreadSafeFibonacciAdder adder = new ThreadSafeFibonacciAdder();
for (int i = 0; i < 4; ++i) {
Thread t = new Thread(new RunnableImpl(adder));
t.start();
threads.add(t);
}
for (Thread t : threads) {
t.join();
}
System.err.println(adder.getSum());
System.err.println("Execution time: " + (System.nanoTime() - start) / 1e9);
}
public void run() {
for (int i = 0; i < 10_000_000; ++i) {
adder.add(i % 50);
}
}