I have a log file that I am reading to a string

public static String Read (String path) throws IOException {
   StringBuilder sb = new StringBuilder();
   InputStream in = new BufferedInputStream(new FileInputStream(path));

   int r;
   while ((r = in.read()) != -1) {
       sb.append(r);
   }
   return sb.toString();
}

Then I have a parser that iterates over the entire string once

void Parse () {
   String con = Read("log.txt");
   for (int i = 0; i < con.length; i++) {
       /* parsing action */
   }
}

This is hugely a waste of cpu cycles. I loop over all the content in Read. Then I loop over all the content in Parse. I could just place the /* parsing action */ under the while loop in the Read method, which would be find but I don't want to copy the same code all over the place.

How can I parse the file in one iteration over the contents and still have separate methods for parsing and reading?

In C# I understand there is some sort of yield return thing, but I'm locked with Java.

What are my options in Java?