How to create an inputStream of UTF-8 encoding for a bufferedReader

Hi all,
I would like to ask if an inputStream of UTF-8 encoding can be created?
I have a function
boolean load(InputStream in){ ....} which has code
BufferedReader br = new BufferedReader(new InputStreamReader(in));
but this function cannot be changed, how to make sure the inputStream is UTF-8 or there's no such method?
Thanks so much!

I would like to send a byte array read from InputStream to another app where they are converted to UTF-8. In brief
-Read input stream which comes in UTF-8 into a byte array
-Send byte array to another app which will convert it into UTF-8 characters

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