sync experiment 3

SyncTest.java

public class SyncTest {

    Character lock1 = 2;
  //Character lock1 = 200; //vs using this for lock.

    public void testr() {
        String name = Thread.currentThread().getName();
        synchronized(lock1) {
            long time1 = System.currentTimeMillis();
            System.out.println("bef: name:" + name + ", time: " + time1 + ", lock1:" + lock1);

            try {
                Thread.sleep(10000);
            } catch (InterruptedException e) { e.printStackTrace(); }

            long time2 = System.currentTimeMillis();
            System.out.println("aft: name:" + name + ", time: " + time2 + ", lock1:" + lock1);

        }
    }

    public static void main(String[] args) {
        SyncTest st1 = new SyncTest();
        SyncTest st2 = new SyncTest();
        SyncTest st3 = new SyncTest();
        ExecutorService ex = Executors.newFixedThreadPool(3);

        ex.submit(st1::testr);
        ex.submit(st2::testr);
        ex.submit(st3::testr);
        ex.shutdown();
    }
}