Question

Okay, I tried everything but I can’t find answer. My data reader skips empty next line while reading from a txt file.
It is supposed to strip all the comments from the txt file and print rest of the data as it is. My reader does strip the comments & prints the data but it skips the empty new lines..

MyDataReader.java

public String readLine()
{
    String buf = new String();
String readStr = new String();

int end = 0;
int done = 0;

try
{
    // checks if line extraction is done and marker has non null value
    while (done != 1 && marker != null)
    {
    readStr = theReader.readLine(); // Reads the line from standard input

    if (readStr != null)
    {
        /* If the first character of line isnt marker */
        if (readStr.length() > 0)
        {
            if (!readStr.substring(0, 1).equalsIgnoreCase(marker))
        {
            end = readStr.indexOf(marker);   // checks if marker exists in the string or not
            if (end > 0)
            buf = readStr.substring(0, end);
            else
            buf = readStr;

            done = 1;   // String extraction is done
         }
        }
    }
    else
    {
            buf = null;
        done = 1;
    }
    }
}
// catches the exception
catch (Exception e)
{
    buf = null;
    System.out.println(e);
}

return buf;
}

---

TestMyDataReader.java

String myStr = new String();

  myStr = _mdr.readLine();

  while (myStr != null)
  {
      //System.out.println("Original String : " + myStr);
      System.out.println(myStr);
      myStr = _mdr.readLine();
  }

Answer 1

if (readStr.length() > 0)

That’s the line of code that is skipping empty lines.