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I saved two classes in two files in the same folder,
the first file needs to call the second file's class,
but it seems like my textpad can not recognize that both files are in the same folder. when I ran the first file, it said second file's variable(which is used in first file, which is also declared as static variable) is not found.
(on other machines textpad, it rans fine)
Does anyone know what's wrong?

Textpad has nothing to do with finding variables.

You are probably using Java? Then your Java compiler or runtime is not set up correctly.