Understanding the DataWriter Nested Class

• The class contains a member variable of type String, which is used to specify the name of the output file.
• The FileWriter and BufferedWriter used to write data to an external file, belong to the Java language rather than the Simcenter STAR-CCM+ API. Use the constructor to create an output file and write a line of table headings.

public DataWriter(String fileToWrite) {
 
  m_outputFile = fileToWrite;
 
  try {
    FileWriter fw =
      new FileWriter(m_outputFile);
    BufferedWriter bw =
      new BufferedWriter(fw);
    bw.write(“Angle (deg), DragCoefficient”);
    bw.newLine();
    bw.close();
  } catch (Exception e) {
  }
}

• The writeDataLine() method opens the output file, adds a line that includes the cross-wind angle and the drag coefficient, then closes the file. The newLine() method is included to move the cursor to the start of the next line in the output file. As the output data is contained in the SimData object, the relevant object is passed to the method in the argument list.
• When the FileWriter object is created in the method, you can see that one of the arguments is true. This results in new data being appended to the end of the file.

public void writeDataLine(SimData sD) {
 
  try {
    FileWriter fw =
      new FileWriter(m_outputFile, true);
    BufferedWriter bw =
      new BufferedWriter(fw);
    bw.write(sD.getAngle() + “, “ + sD.getDrag());
    bw.newLine();
    bw.close();
  } catch (Exception e) {
  }
}