Multi threading and shared object?

In case update to memPay depends on the memPay contents (like memPay. Amount+=100) you should block access for other threads when you are updating. This looks like.

You could simply use a ReentrantReadWriteLock. That way, you could have multiple threads reading at the same time, without issue, but only one would be allowed to modify data. And Java handles the concurrency for you.

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