Java String count line

import java.io.BufferedReader;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
  public static void main(String[] argv) throws IOException{
    System.out.println(countLinesBuffer("\n\n\n\n\n"));
  }//from w w  w  .j av a2  s. c om

  /**
   * Count the number of lines in the buffer.
   *
   * @param strData
   *          String
   * @return int
   * @throws IOException
   */
  public static int countLinesBuffer(final String strData) throws IOException {
    if (strData != null) {
      final ByteArrayInputStream stream = new ByteArrayInputStream(strData.getBytes());
      final BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
      int lineNumber = 0;
      String data = "";
      do {
        data = reader.readLine();
        if (data != null) {
          lineNumber++;
        } // End of the if //
      } while (data != null);
      reader.close();
      return lineNumber;

    }
    return 0;
  }
}