Re: Reading data into a JList

import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.text.NumberFormat;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JFrame;
import javax.swing.JList;
import javax.swing.JPanel;

public class ComputerNames
extends JPanel
{
  private static final long serialVersionUID = 1L;
  private JList list;
  public ComputerNames()
  {
    super(new BorderLayout());
    List<Integer> computerData = null;
    try
    {
      writeData();
      computerData = readData();
    }
    catch (IOException e)
    {
      e.printStackTrace();
    }

    list = new JList();
    list.setListData(listComputers(computerData).toArray());
    add(list, BorderLayout.CENTER);
  }

  private static void createAndShowGUI()
  {
    JFrame frame = new JFrame("ComputerNames");
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.add(new ComputerNames());
    frame.pack();
    frame.setVisible(true);
  }

  public static void main(String[] args)
  {
    EventQueue.invokeLater(new Runnable()
    {
      public void run()
      {
        createAndShowGUI();
      }
    });
  }

  public static List<String> listComputers(List<Integer> data)
  {
    List<String> computerNames = new ArrayList<String>();
    NumberFormat format = NumberFormat.getInstance();
    format.setMinimumIntegerDigits(2);
    computerNames.add("RM49_AD");
    for(int i = 0; i < data.size(); i = i+2)
    {
      computerNames.add("RM" + data.get(i) + "_" +
format.format(data.get(i+1)));
    }
    return computerNames;
  }

  static void writeData()
  throws IOException
  {
    File f = new File("chars");
    String fileContents =
      "49014902490349044905" +
      "49064907490849094910" +
      "49114912491349144915" +
      "49164917491849194920" +
      "49214922492349244925" +
      "49264927492849294930";

    FileWriter fos = new FileWriter(f);
    fos.write(fileContents);
    fos.close();
  }

  static List<Integer> readData()
  throws NumberFormatException, IOException
  {
    List<Integer> list = null;
    File f = new File("chars");
    FileReader fis = new FileReader(f);
    char[] tmp = new char[2];
    list = new ArrayList<Integer>();
    int ii;
    while ((ii = fis.read(tmp)) > -1)
    {
      list.add(Integer.valueOf(new String(tmp)));
    }
    fis.close();
    return list;
  }
}