J2ME Program to Read the Contents of a file

Aim: - Write a Program to Read the Contents of a file.

import java.io.*;

import javax.microedition.midlet.*;

import javax.microedition.lcdui.*;

public class ReadFile extends MIDlet implements CommandListener

{

  private Display display;

  private Form form;

  private Command read, exit;

  private Alert alert;

  public ReadFile()

  {

    display = Display.getDisplay(this);

    read = new Command("Read", Command.SCREEN, 1);

    exit = new Command("Exit", Command.EXIT, 1);   

    form = new Form("Read File");

    form.addCommand(exit);

    form.addCommand(read);

    form.setCommandListener(this);

  }

  public void startApp()

  {

    display.setCurrent(form);

  }

  public void pauseApp()

 {}

  public void destroyApp(boolean unconditional)

  {

    notifyDestroyed();

  }

  public void commandAction(Command c, Displayable s)

{

    String label = c.getLabel();

    if (label.equals("Read")){

      String string = file();

      if (string != null)

{

        alert = new Alert("Reading", string, null, null);

        alert.setTimeout(Alert.FOREVER);

        display.setCurrent(alert, form);

      }

    } else if (label.equals("Exit")){

      destroyApp(false);

    }

  }

  private String file()

{

    InputStream is = getClass().getResourceAsStream("help.txt");

    StringBuffer sb = new StringBuffer();

    try{

      int chars, i = 0;

      while ((chars = is.read()) != -1){

        sb.append((char) chars);

      }

      return sb.toString();

    }

catch (Exception e)

 {}

    return null;

}

}

Output:-