Assume Two Threads Share a BankAccount Object with Balance of Zero

question 81

Multiple Choice

Assume two threads share a BankAccount object with balance of zero (0) , and that the BankAccount class provides deposit and withdraw methods and has a ReentrantLock named myLock, as shown below. Note that only the deposit method uses the lock. Thread one deposits $10 ten times and, concurrently, thread two withdraws $10 ten times. Which statement regarding the balance after all thread calls is definitely true?
Public void deposit(int dollars)
{
MyLock.lock()
Int newBalance = balance + dollars;
System.out.println("depositing") ;
Balance = newBalance;
MyLock.unlock()
}
Public void withdraw(int dollars)
{
Int newBalance = balance - dollars;
System.out.println("withdrawing") ;
Balance = newBalance;
}

• A) The balance could be zero or positive.
• B) The balance is zero.
• C) The balance could be zero or negative.
• D) The balance is positive.

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Definitions:

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