Read line from an InputStream

I'm using an InputStream to read some data and I want to read characters until new line or '\n'.

The InputStream is a generic input stream of bytes not tight to any specific implementation or any source (like a file).

You should use BufferedReader with FileReader if your read from a file

BufferedReader reader = new BufferedReader(new FileReader(pathToFile));

or with InputStreamReader if you read from any other InputStream

BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));

Then use its readLine() method in a loop

while(reader.ready()) {
     String line = reader.readLine();
}

But if you really love InputStream then you can use a loop like this

InputStream stream; 
char c; 
String s = ""; 
do {
   c = stream.read(); 
   if (c == '\n')
      break; 
   s += c + "";
} while (c != -1);