Analysis of Java multithreaded callback method instance

The so-called callback is that the client program C calls a method a in the service program s, and then s calls a method B in C at some time. For C, this B is called the callback method.

Let's take a practical example to understand:

This example sets up a questioner and a respondent. When the respondent needs to answer a very profound question of the questioner, it takes a lot of time to find it, and the questioner starts to do other things,

After the respondent finds the answer, tell the questioner the answer.

I Class of questioner

When it comes to thinking for a long time, sleep and inherit thread

2、 Class of questioner

Operation results:

It can be seen that the questioner must first explain how the respondent answers the question,

Then the questioner does his own thing, and the respondent begins to think about the answer.

The specific expression of the contact information explained here is to instantiate the callback interface and implement the answer method in the questioner's class.

Most of the content has been reflected in the code, so I won't repeat it here.

summary

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