How to overwrite file via java nio writer?

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You want to call the method without any OpenOption arguments.

Files.write(path, content.getBytes());

From the Javadoc:

The options parameter specifies how the the file is created or opened.
If no options are present then this method works as if the CREATE,
TRUNCATE_EXISTING, and WRITE options are present. In other words, it
opens the file for writing, creating the file if it doesn’t exist, or
initially truncating an existing regular-file to a size of 0

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