why doesn't this synchronized method work as expected?

Question

I have a class called \"Account\"

public class Account {

    public double balance = 1500;

    public synchronized double withDrawFromPrivateBalance(double         


        

Answer 1

Marking a method synchronized obtains a lock on the object that the method is being run on, but there are two different objects here: the ATMThread and the Account.

In any event, the two different ATMThreads are using different locks, so their writes can overlap and conflict with one another.

Instead, you should have both ATMThreads synchronize on the same object.