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A transaction is a set of operations that must all succeed; failure in any of the operations results in a rollback, such that none of the operations takes effect. (For questions about financial transactions that do not have this all-or-nothing property, use the [finance] tag instead.)
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Thread Safe Bank Transaction: Deposit, Withdrawal, Check Balance and Transfer in Java
Let's break this down.
You have two locks for single object that guarding same fields.
It's generally bad practice, and it doesn't make sense as second lock(transferLock) is used only in single oper …