package ifeve;

public class ConcurrencyTest {

 private static final long count = 100000000L;

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

 public static void concurrency() throws InterruptedException {
 long start = System.currentTimeMillis();
 Thread thread = new Thread(new Runnable() {
 @Override
 public void run() {
 int a = 0;
 for (int i = 0; i < count; i++) {
 a += 5;
 }
 }
 });
 thread.start();
 int b = 0;
 for (int i = 0; i < count; i++) {
 b--;
 }
 long time = System.currentTimeMillis() - start;
 thread.join();
 System.out.println("concurrency :" + time + "ms,b=" + b);
 }

 private static void serial() {
 long start = System.currentTimeMillis();
 int a = 0;
 for (int i = 0; i < count; i++) {
 a += 5;
 }
 int b = 0;
 for (int i = 0; i < count; i++) {
 b--;
 }
 long time = System.currentTimeMillis() - start;
 System.out.println("serial: " + time + "ms,b=" + b + ", a=" + a);
 }
}