[Solved] How can I separate a single String into two parts? [duplicate]

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You used to have

str.split(",");

and split() is a void method. It doesn’t alter str.

you could fix it by replacing str.split(",") with: str = str.split(","), or you could put it all on one line like:

while ((str = br1.readLine()) != null)
    userstr.add(str.split(",")[0]);

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solved How can I separate a single String into two parts? [duplicate]