public class SpeedTest {
    private static final Long count = 10000L;

    public static void main(String[] args) throws InterruptedException {
        concurrency();
        serial();
    }

    private static void concurrency() throws InterruptedException {
        long start = System.currentTimeMillis();
        Thread test = new Thread(new Runnable() {
            public void run() {
                int a = 0;
                for (long i = 0; i < count; i++) {
                    a += 5;
                }
            }
        }, "test");
        test.start();
        int b = 0;
        for (long j = 0; j < count; j++) {
            b--;
        }
        long end = System.currentTimeMillis() - start;
        test.join();
        System.out.println("多線程" + end);
    }

    private static void serial(){
        long start = System.currentTimeMillis();
        int a = 0;
        for (long i = 0; i < count; i++) {
            a += 5;
        }
        int b = 0;
        for (long j = 0; j < count; j++) {
            b--;
        }
        long end = System.currentTimeMillis() - start;
        System.out.println("單線程" + end);
    }
}