Answers

5. There are many possible scenarios. Here is one:
   • The first thread loses control after the first print statement.
   • The second thread loses control just before the assignment balance = newBalance.
   • The first thread completes the deposit method.
   • The second thread completes the withdraw method.
6. One thread calls addFirst and is preempted just before executing the assignment first = newLink. Then the next thread calls addFirst, using the old value of first. Then the first thread completes the process, setting first to its new link. As a result, the links are not in sequence.