Objectinputstream of IO stream reports an error (resolved)

Problem: there was an error writing the serialized IO stream today

… eofexception:
exception in thread “main” java.io.streamcorruptedexception: invalid stream header: 7b312c22

take a look at my code

After analysis, the problem has been solved:

Look at the correct code:

The code didn’t change, just changed the order inside and solved it successfully. The specific causes are described in the figure

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