What is the difference between synchronous interaction and asynchronous interaction in java

Synchronous interaction:

refers to sending a request and waiting for a return before sending the next request. There is a waiting process.

Asynchronous interaction:

refers to sending a request without waiting for a return. The next request can be sent at any time, that is, there is no need to wait.

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Difference:

One needs to wait, the other does not need to wait. In some cases, our In project development, asynchronous interaction methods that do not require waiting will be preferred.

In which situations is it recommended to use synchronous interaction?

For example, bank transfer systems, database save operations, etc. will all use synchronous interactive operations, and in other cases, asynchronous interactions will be used first.

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