//ReadFile_01.java

import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.UnsupportedEncodingException;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;

class ReadFile_01 {

  public static String[][] toStringArray2D(
              File inputFile,
              String encoding,
              String delimiters
  ){
      String[][] array2D = null;

      ArrayList<String> list = fileToList(inputFile, encoding);

      if(list!=null){
          array2D = new String[list.size()][];
          for(int i=0; i< list.size(); i++){
              array2D[i] = list.get(i).split(delimiters);
          }
      }else{
          return null;
      }
      return array2D;
  }

  private static ArrayList<String> fileToList(
              File inputFile,
              String encoding
  ){
      ArrayList<String> list = null; //try-catch の外で宣言。

      try {
          //ここは慣用句です。
          BufferedReader br = new BufferedReader(
                        new InputStreamReader(
                            new FileInputStream(inputFile), encoding
                        )
                    );

          //list に書き出します。
          list = new ArrayList<String>();
          String strLine;
          while((strLine = br.readLine()) != null) {
              list.add(strLine);
          }
          br.close();

      } catch (UnsupportedEncodingException e) {
          e.printStackTrace();
      } catch (FileNotFoundException e) {
          e.printStackTrace();
      } catch (IOException e){
          e.printStackTrace();
      }
      return list;
  }
}