How to create InputStreams properly

Question

I see people many times declaring Streams like, for example:
InputStream IS = new FileInputStream(path);
But I myself mostly create Streams like:
FileInputStream FIS = new FileInputStream(path);
Can somebody explain me what's the difference between these?

I thought first one is for declaring Stream shortly, but when I create it like
Reader br = BufferedReader(IS); I noticed that my object br doesn't get BufferedReader's method like readLine() and etc

Answer 1

GOOD GAMER SHOW try to add the new keyword in
Buffer br = new BufferReader(IS);