J2ME入门：建立一个MIDlets

import java.io.*;
import javax.microedition.io.*;
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

public class Jargoneer extends MIDlet
   implements CommandListener, Runnable {
   private Display mDisplay;

   private Command mExitCommand, mFindCommand, mCancelCommand;

   private TextBox mSubmitBox;
   private Form mProgressForm;
   private StringItem mProgressString;

   public Jargoneer() {
      mExitCommand = new Command("Exit", Command.EXIT, 0);
      mFindCommand = new Command("Find", Command.SCREEN, 0);
      mCancelCommand = new Command("Cancel", Command.CANCEL, 0);

      mSubmitBox = new TextBox("Jargoneer", "", 32, 0);
      mSubmitBox.addCommand(mExitCommand);
      mSubmitBox.addCommand(mFindCommand);
      mSubmitBox.setCommandListener(this);

      mProgressForm = new Form("Lookup progress");
      mProgressString = new StringItem(null, null);
      mProgressForm.append(mProgressString);
   }

   public void startApp() {
      mDisplay = Display.getDisplay(this);

      mDisplay.setCurrent(mSubmitBox);
   }

   public void pauseApp() {}

   public void destroyApp(boolean unconditional) {}

   public void commandAction(Command c, Displayable s) {
      if (c == mExitCommand) {
         destroyApp(false);
         notifyDestroyed();
      }
      else if (c == mFindCommand) {
         // Show the progress form.
         mDisplay.setCurrent(mProgressForm);
         // Kick off the thread to do the query.
         Thread t = new Thread(this);
         t.start();
      }
   }

   public void run() {
      String Word = mSubmitBox.getString();
      String definition;

   try { definition = lookUp(word); }
   catch (IOException ioe) {
      Alert report = new Alert(
         "Sorry",
         "Something went wrong and that " +
         "definition could not be retrieved.",
         null, null);
      report.setTimeout(Alert.FOREVER);
      mDisplay.setCurrent(report, mSubmitBox);
      return;
   }

   Alert results = new Alert("Definition", definition,
      null, null);
   results.setTimeout(Alert.FOREVER);
   mDisplay.setCurrent(results, mSubmitBox);
   }

   private String lookUp(String word) throws IOException {
      HttpConnection hc = null;
      InputStream in = null;
      String definition = null;
      try {
         String baseURL = "http://65.215.221.148:8080/wj2/jargoneer?word=";
         String url = baseURL + word;
         mProgressString.setText("Connecting...");
         hc = (HttpConnection)Connector.open(url);
         hc.setRequestProperty("Connection", "close");
         in = hc.openInputStream();

         mProgressString.setText("Reading...");
         int contentLength = (int)hc.getLength();
         if (contentLength == -1) contentLength = 255;
         byte[] raw = new byte[contentLength];
         int length = in.read(raw);

      // Clean up.
      in.close();
      hc.close();

      definition = new String(raw, 0, length);
   }
   finally {
      try {
         if (in != null) in.close();
         if (hc != null) hc.close();
      }
      catch (IOException ignored) {}
   }

   return definition;
   }
} 

<J2ME Wireless Toolkit Directory>
   apps
      Jargoneer
         bin
         lib
         res
         src

（出处：http://www.VeVb.com）