Java - Turning Integers into Character with a Charset -

need convert int char representation. did :

char c = (char) integer; 

but doesn’t support charset. thought using this:

string s = new string(byte[], charset); 

or :

charset.forname("utf-8").newdecoder().decode(bytebuffer); 

but both of them needs bytes. how can turn int char charset?
thank in advance.