What is the difference between asynchronous interaction and synchronous 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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The difference between the two:

One needs to wait, the other does not Waiting. In some cases, in our project development, we will give priority to asynchronous interaction methods that do not require waiting.

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. In other cases, asynchronous interactions will be used first.

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