FutureTask.get seems to be a blocking method. how much faster is "faster"?
if the operation is already very fast, the speed improvement brought by multithreading will be limited, or even make the operation slower
what thread pool is the pool in the code? If the number of threads is small, it may not be able to give full play to the advantages of multithreading, and if the number of initialization threads is relatively small, the code will have the overhead of creating threads at run time
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