JUC-关于CopyOnWriteArrayList的疑问

        transient final ReentrantLock lock = new ReentrantLock();
           .....................
           .....................

              
        private static final Unsafe unsafe = Unsafe.getUnsafe();
        private static final long lockOffset;
        static {
          try {
               lockOffset = unsafe.objectFieldOffset
                  (CopyOnWriteArrayList.class.getDeclaredField("lock"));
               } catch (Exception ex) { throw new Error(ex); }
        }
        private void resetLock() {
            unsafe.putObjectVolatile(this, lockOffset, new ReentrantLock());
        }

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