[Solved] what size of the array after Java String.split()?

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You probably want

s.split("#", -1);

From the docs on the 2-arg form:

If n is non-positive then the pattern will be applied as many times as possible and the array can have any length. If n is zero then the pattern will be applied as many times as possible, the array can have any length, and trailing empty strings will be discarded.

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solved what size of the array after Java String.split()?