How to Remove Main()

[jtr]

I've written a stand alone program that performs simple text i/o. I would like to remove the main() method.

Are there any java experts in here that would show the code to split the attached program file into a ReadFileIn and a ReadFileInTestDrive?

I'm new to objects and I'm having a difficult time understanding how to move the main method from ReadFileIn.java to a new program ReadFileInTestDrive.java.

[sjalle]

No big deal really. Read my comments.

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.io.File;
import java.util.regex.*;

/**
 * >> Put this class in s file called  ReadFileInDriver.java
 *
 */
public class ReadFileInDriver {
  public static void main(String[] args) {
    if (args.length != 1)
      System.err.println("Usage: java ReadFileIn <source>");
    else {
      // you could have passed the filepath to the constructor, so when you 
      // want to parse several files, then the parse result could be kept by 
      // different ReadFileIn objects, each identifieable by the file they have
      // parsed.
      ReadFileIn rIn=new ReadFileIn();
      try {
        rIn.readit( args[0] );
      } catch(IOException e) {
        e.printStackTrace();
      }
    }
  }

}
/**
* A program that reads an ascii, comma-delimited file
 * >> put this class in a file called ReadFileIn.java,
 * >> AND declare it as 'public class ReadFileIn' -> When classes share
 * >> the same file then only one can be 'public'
**/

class ReadFileIn {
  public ReadFileIn() {} // default constructor, does basically nothing
  /**
   * readit is the static method that performs the file read.
   **/

  public static void readit(String from_name) throws IOException {
    File from_file = new File(from_name);

    // does source file exist and is it readable
    if (!from_file.exists())
      System.out.println("no source file: " + from_name);
    if (!from_file.isFile())
      System.out.println("unable to read directory: " + from_name);
    if (!from_file.canRead())
      System.out.println("source file is unreadable: " + from_name);

      // read all lines from the file

    //first create a FileReader Object
    // then create a BufferedReader so we can use the readLine() method
    // could have done it with one line : BufferedReader in = new BufferedReader(new FileReader(from_name));

    try {

      FileReader filer = new FileReader(from_name);
      BufferedReader reader = new BufferedReader(filer);

      int count = 0;
      int blanks = 0;

      String line = null;

      // read a line of text, assign it to line variable, while not null
      // loop

      while ( (line = reader.readLine()) != null) {

        System.out.println(line);

        count++;

        if (line.equals("")) {
          blanks++;
        }

        String[] fieldArray = line.split(",");

        for (int i = 0; i < fieldArray.length; ++i) {

          System.out.println(fieldArray[i]);

        }

      }

      reader.close();

      System.out.println("lines: " + count + " blank lines: " + blanks);
    }
    catch (IOException except) {
      except.printStackTrace();
    }
  }
}