{"id":317,"date":"2007-10-17T00:00:00","date_gmt":"2007-10-17T00:00:00","guid":{"rendered":"http:\/\/www.strongd.net\/?p=317"},"modified":"2007-10-17T00:00:00","modified_gmt":"2007-10-17T00:00:00","slug":"J2ME : Sort Record Example","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=317","title":{"rendered":"J2ME : Sort Record Example"},"content":{"rendered":"

import <\/STRONG><\/FONT>javax.microedition.rms.*;<\/FONT>
import <\/B><\/FONT>javax.microedition.midlet.*;<\/FONT>
import <\/B><\/FONT>javax.microedition.lcdui.*;<\/FONT>
import <\/B><\/FONT>java.io.*;<\/FONT>
<\/FONT>
public class <\/B><\/FONT>SortExample <\/FONT>extends <\/B><\/FONT>MIDlet <\/FONT>implements <\/B><\/FONT>CommandListener<\/FONT>
{<\/FONT>
  <\/FONT>private <\/B><\/FONT>Display display;<\/FONT>
  <\/FONT>private <\/B><\/FONT>Alert alert;<\/FONT>
  <\/FONT>private <\/B><\/FONT>Form <\/FONT>form<\/B><\/FONT>; <\/FONT>
  <\/FONT>private <\/B><\/FONT>Command exit; <\/FONT>
  <\/FONT>private <\/B><\/FONT>Command start;<\/FONT>
  <\/FONT>private <\/B><\/FONT>RecordStore recordstore = <\/FONT>null<\/B><\/FONT>;<\/FONT>
  <\/FONT>private <\/B><\/FONT>RecordEnumeration recordEnumeration = <\/FONT>null<\/B><\/FONT>;<\/FONT>
  <\/FONT>private <\/B><\/FONT>Comparator comparator = <\/FONT>null<\/B><\/FONT>;<\/FONT>
  <\/FONT>public <\/B><\/FONT>SortExample <\/FONT>()<\/FONT>
  <\/FONT>{<\/FONT>
    <\/FONT>display = Display.getDisplay<\/FONT>(<\/FONT>this<\/B><\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>exit = <\/FONT>new <\/B><\/FONT>Command<\/FONT>(<\/FONT>“Exit”<\/FONT>, Command.SCREEN, <\/FONT>1<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>start = <\/FONT>new <\/B><\/FONT>Command<\/FONT>(<\/FONT>“Start”<\/FONT>, Command.SCREEN, <\/FONT>1<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>form <\/B><\/FONT>= <\/FONT>new <\/B><\/FONT>Form<\/FONT>(<\/FONT>“Mixed RecordEnumeration”<\/FONT>, <\/FONT>null<\/B><\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>form<\/B><\/FONT>.addCommand<\/FONT>(<\/FONT>exit<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>form<\/B><\/FONT>.addCommand<\/FONT>(<\/FONT>start<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>form<\/B><\/FONT>.setCommandListener<\/FONT>(<\/FONT>this<\/B><\/FONT>)<\/FONT>;<\/FONT>
  <\/FONT>}<\/FONT>
  <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>startApp<\/FONT>()<\/FONT>
  <\/FONT>{<\/FONT>
    <\/FONT>display.setCurrent<\/FONT>(<\/FONT>form<\/B><\/FONT>)<\/FONT>;<\/FONT>
  <\/FONT>}<\/FONT>
  <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>pauseApp<\/FONT>()<\/FONT>
  <\/FONT>{<\/FONT>
  <\/FONT>}<\/FONT>
  <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>destroyApp<\/FONT>( <\/FONT>boolean <\/B><\/FONT>unconditional <\/FONT>)<\/FONT>
  <\/FONT>{<\/FONT>
  <\/FONT>}<\/FONT>
  <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>commandAction<\/FONT>(<\/FONT>Command command, Displayable displayable<\/FONT>)<\/FONT>
  <\/FONT>{<\/FONT>
    <\/FONT>if <\/B><\/FONT>(<\/FONT>command == exit<\/FONT>)<\/FONT>
    <\/FONT>{<\/FONT>
      <\/FONT>destroyApp<\/FONT>(<\/FONT>true<\/B><\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>notifyDestroyed<\/FONT>()<\/FONT>;<\/FONT>
    <\/FONT>}<\/FONT>
    <\/FONT>else if <\/B><\/FONT>(<\/FONT>command == start<\/FONT>)<\/FONT>
    <\/FONT>{<\/FONT>
      <\/FONT>try<\/B><\/FONT>
      <\/FONT>{<\/FONT>
        <\/FONT>recordstore = RecordStore.openRecordStore<\/FONT>(<\/FONT>
                      <\/FONT>“myRecordStore”<\/FONT>, <\/FONT>true <\/B><\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>}<\/FONT>
      <\/FONT>catch <\/B><\/FONT>(<\/FONT>Exception error<\/FONT>)<\/FONT>
      <\/FONT>{<\/FONT>
        <\/FONT>alert = <\/FONT>new <\/B><\/FONT>Alert<\/FONT>(<\/FONT>“Error Creating”<\/FONT>, <\/FONT>
             <\/FONT>error.toString<\/FONT>()<\/FONT>, null, AlertType.WARNING<\/FONT>)<\/FONT>; <\/FONT>
        <\/FONT>alert.setTimeout<\/FONT>(<\/FONT>Alert.FOREVER<\/FONT>)<\/FONT>; <\/FONT>
        <\/FONT>display.setCurrent<\/FONT>(<\/FONT>alert<\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>}<\/FONT>
      <\/FONT>try<\/B><\/FONT>
      <\/FONT>{<\/FONT>
        <\/FONT>String outputData<\/FONT>[] <\/FONT>= <\/FONT>{<\/FONT>“Mary”<\/FONT>, <\/FONT>“Bob”<\/FONT>, <\/FONT>“Adam”<\/FONT>}<\/FONT>;<\/FONT>
        <\/FONT>for <\/B><\/FONT>(<\/FONT>int <\/B><\/FONT>x = <\/FONT>0<\/FONT>; x < <\/FONT>3<\/FONT>; x++<\/FONT>)<\/FONT>
        <\/FONT>{<\/FONT>
          <\/FONT>byte<\/B><\/FONT>[] <\/FONT>byteOutputData = outputData<\/FONT>[<\/FONT>x<\/FONT>]<\/FONT>.getBytes<\/FONT>()<\/FONT>;<\/FONT>
          <\/FONT>recordstore.addRecord<\/FONT>(<\/FONT>byteOutputData, <\/FONT>0<\/FONT>, <\/FONT>
                   <\/FONT>byteOutputData.length<\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>}<\/FONT>
      <\/FONT>}<\/FONT>
      <\/FONT>catch <\/B><\/FONT>( <\/FONT>Exception error<\/FONT>)<\/FONT>
      <\/FONT>{<\/FONT>
       <\/FONT>alert = <\/FONT>new <\/B><\/FONT>Alert<\/FONT>(<\/FONT>“Error Writing”<\/FONT>, <\/FONT>
                <\/FONT>error.toString<\/FONT>()<\/FONT>, null, AlertType.WARNING<\/FONT>)<\/FONT>; <\/FONT>
       <\/FONT>alert.setTimeout<\/FONT>(<\/FONT>Alert.FOREVER<\/FONT>)<\/FONT>; <\/FONT>
       <\/FONT>display.setCurrent<\/FONT>(<\/FONT>alert<\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>}<\/FONT>
      <\/FONT>try<\/B><\/FONT>
      <\/FONT>{<\/FONT>
        <\/FONT>StringBuffer buffer = <\/FONT>new <\/B><\/FONT>StringBuffer<\/FONT>()<\/FONT>;<\/FONT>
        <\/FONT>Comparator comparator = <\/FONT>new <\/B><\/FONT>Comparator<\/FONT>()<\/FONT>;<\/FONT>
        <\/FONT>recordEnumeration = recordstore.enumerateRecords<\/FONT>(<\/FONT>
                          <\/FONT>null, comparator, <\/FONT>false<\/B><\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>while <\/B><\/FONT>(<\/FONT>recordEnumeration.hasNextElement<\/FONT>())<\/FONT>
        <\/FONT>{<\/FONT>
          <\/FONT>buffer.append<\/FONT>(<\/FONT>new <\/B><\/FONT>String<\/FONT>(<\/FONT>recordEnumeration.nextRecord<\/FONT>()))<\/FONT>;<\/FONT>
          <\/FONT>buffer.append<\/FONT>(<\/FONT>“\\n”<\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>}<\/FONT>
        <\/FONT>alert = <\/FONT>new <\/B><\/FONT>Alert<\/FONT>(<\/FONT>“Reading”<\/FONT>, buffer.toString<\/FONT>() <\/FONT>, <\/FONT>
                 <\/FONT>null, AlertType.WARNING<\/FONT>)<\/FONT>; <\/FONT>
        <\/FONT>alert.setTimeout<\/FONT>(<\/FONT>Alert.FOREVER<\/FONT>)<\/FONT>; <\/FONT>
        <\/FONT>display.setCurrent<\/FONT>(<\/FONT>alert<\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>}<\/FONT>
      <\/FONT>catch <\/B><\/FONT>(<\/FONT>Exception error<\/FONT>)<\/FONT>
      <\/FONT>{<\/FONT>
        <\/FONT>alert = <\/FONT>new <\/B><\/FONT>Alert<\/FONT>(<\/FONT>“Error Reading”<\/FONT>, <\/FONT>
                  <\/FONT>error.toString<\/FONT>()<\/FONT>, null, AlertType.WARNING<\/FONT>)<\/FONT>; <\/FONT>
        <\/FONT>alert.setTimeout<\/FONT>(<\/FONT>Alert.FOREVER<\/FONT>)<\/FONT>; <\/FONT>
        <\/FONT>display.setCurrent<\/FONT>(<\/FONT>alert<\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>}<\/FONT>
      <\/FONT>try<\/B><\/FONT>
      <\/FONT>{<\/FONT>
       <\/FONT>recordstore.closeRecordStore<\/FONT>()<\/FONT>;<\/FONT>
      <\/FONT>}<\/FONT>
      <\/FONT>catch <\/B><\/FONT>(<\/FONT>Exception error<\/FONT>)<\/FONT>
      <\/FONT>{<\/FONT>
        <\/FONT>alert = <\/FONT>new <\/B><\/FONT>Alert<\/FONT>(<\/FONT>“Error Closing”<\/FONT>, <\/FONT>
                    <\/FONT>error.toString<\/FONT>()<\/FONT>, null, AlertType.WARNING<\/FONT>)<\/FONT>; <\/FONT>
        <\/FONT>alert.setTimeout<\/FONT>(<\/FONT>Alert.FOREVER<\/FONT>)<\/FONT>; <\/FONT>
        <\/FONT>display.setCurrent<\/FONT>(<\/FONT>alert<\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>}<\/FONT>
      <\/FONT>if <\/B><\/FONT>(<\/FONT>RecordStore.listRecordStores<\/FONT>() <\/FONT>!= <\/FONT>null<\/B><\/FONT>)<\/FONT>
      <\/FONT>{<\/FONT>
        <\/FONT>try<\/B><\/FONT>
        <\/FONT>{<\/FONT>
          <\/FONT>RecordStore.deleteRecordStore<\/FONT>(<\/FONT>“myRecordStore”<\/FONT>)<\/FONT>;<\/FONT>
          <\/FONT>recordEnumeration.destroy<\/FONT>()<\/FONT>;<\/FONT>
        <\/FONT>}<\/FONT>
        <\/FONT>catch <\/B><\/FONT>(<\/FONT>Exception error<\/FONT>)<\/FONT>
        <\/FONT>{<\/FONT>
         <\/FONT>alert = <\/FONT>new <\/B><\/FONT>Alert<\/FONT>(<\/FONT>“Error Removing”<\/FONT>, <\/FONT>
                <\/FONT>error.toString<\/FONT>()<\/FONT>, null, AlertType.WARNING<\/FONT>)<\/FONT>; <\/FONT>
         <\/FONT>alert.setTimeout<\/FONT>(<\/FONT>Alert.FOREVER<\/FONT>)<\/FONT>; <\/FONT>
         <\/FONT>display.setCurrent<\/FONT>(<\/FONT>alert<\/FONT>)<\/FONT>;<\/FONT>
        <\/FONT>}<\/FONT>
      <\/FONT>}      <\/FONT>
    <\/FONT>}<\/FONT>
  <\/FONT>}     <\/FONT>
}<\/FONT>
class <\/B><\/FONT>Comparator <\/FONT>implements <\/B><\/FONT>RecordComparator<\/FONT>
{<\/FONT>
  <\/FONT>public <\/B><\/FONT>int <\/B><\/FONT>compare<\/FONT>(<\/FONT>byte<\/B><\/FONT>[] <\/FONT>record1, <\/FONT>byte<\/B><\/FONT>[] <\/FONT>record2<\/FONT>)<\/FONT>
  <\/FONT>{<\/FONT>
    <\/FONT>String string1 = <\/FONT>new <\/B><\/FONT>String<\/FONT>(<\/FONT>record1<\/FONT>)<\/FONT>, <\/FONT>
               <\/FONT>string2= <\/FONT>new <\/B><\/FONT>String<\/FONT>(<\/FONT>record2<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>int <\/B><\/FONT>comparison = string1.compareTo<\/FONT>(<\/FONT>string2<\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>if <\/B><\/FONT>(<\/FONT>comparison == <\/FONT>0<\/FONT>)<\/FONT>
      <\/FONT>return <\/B><\/FONT>RecordComparator.EQUIVALENT;<\/FONT>
    <\/FONT>else if <\/B><\/FONT>(<\/FONT>comparison < <\/FONT>0<\/FONT>)<\/FONT>
      <\/FONT>return <\/B><\/FONT>RecordComparator.PRECEDES;<\/FONT>
    <\/FONT>else<\/B><\/FONT>
      <\/FONT>return <\/B><\/FONT>RecordComparator.FOLLOWS;<\/FONT>
  <\/FONT>}<\/FONT>
}<\/FONT><\/FONT><\/DIV><\/p>\n","protected":false},"excerpt":{"rendered":"

import javax.microedition.rms.*;import javax.microedition.midlet.*;import javax.microedition.lcdui.*;import java.io.*;public class SortExample extends MIDlet implements CommandListener{  private Display display;  private Alert alert;  private Form form;   private Command exit;   private Command start;  private RecordStore recordstore = null;  private RecordEnumeration recordEnumeration = null;  private Comparator comparator = null;  public SortExample ()  {    display = Display.getDisplay(this);    exit = new Command(“Exit”, Command.SCREEN, 1);    start = new Command(“Start”, Command.SCREEN, 1);    form = new Form(“Mixed RecordEnumeration”, null);    form.addCommand(exit);    form.addCommand(start);    form.setCommandListener(this);  }  public void startApp()  {    display.setCurrent(form);  }  public void pauseApp()  {  }  public void destroyApp( boolean unconditional )  {  }  public void commandAction(Command command, Displayable displayable)  {    if (command == exit)    {      destroyApp(true);      notifyDestroyed();    }    else if (command == start)    {      try      {        recordstore = RecordStore.openRecordStore(                      “myRecordStore”, true );      }      catch (Exception error)      {        alert = new Alert(“Error Creating”,              error.toString(), null, AlertType.WARNING);         alert.setTimeout(Alert.FOREVER);         display.setCurrent(alert);      }      try      {        String outputData[] = {“Mary”, “Bob”, “Adam”};        for (int x = 0; x < 3; x++)        {          byte[] byteOutputData = outputData[x].getBytes();          recordstore.addRecord(byteOutputData, 0,                    byteOutputData.length);        }      }      catch ( Exception error)      {       alert = new Alert(“Error Writing”,                 error.toString(), null, AlertType.WARNING);        alert.setTimeout(Alert.FOREVER);        display.setCurrent(alert);      }      try      {        StringBuffer buffer = new StringBuffer();        Comparator comparator = new Comparator();        recordEnumeration = recordstore.enumerateRecords(                          null, comparator, false);        while (recordEnumeration.hasNextElement())        {          buffer.append(new String(recordEnumeration.nextRecord()));          buffer.append(“\\n”);        }        alert = new Alert(“Reading”, buffer.toString() ,                  null, AlertType.WARNING);         alert.setTimeout(Alert.FOREVER);         display.setCurrent(alert);      }      catch (Exception error)      {        alert = new Alert(“Error Reading”,                   error.toString(), null, AlertType.WARNING);         alert.setTimeout(Alert.FOREVER);         display.setCurrent(alert);      }      try      {       recordstore.closeRecordStore();      }      catch (Exception error)      {        alert = new Alert(“Error Closing”,                     error.toString(), null, AlertType.WARNING);         alert.setTimeout(Alert.FOREVER);         display.setCurrent(alert);      }      if (RecordStore.listRecordStores() != null)      {        try        {          RecordStore.deleteRecordStore(“myRecordStore”);          recordEnumeration.destroy();        }        catch (Exception error)        {         alert = new Alert(“Error Removing”,                 error.toString(), null, AlertType.WARNING);          alert.setTimeout(Alert.FOREVER);          display.setCurrent(alert);        }      }          }  }     }class Comparator implements RecordComparator{  public int compare(byte[] record1, byte[] record2)  {    String string1 = new String(record1),                string2= new String(record2);    int comparison = string1.compareTo(string2);    if (comparison == 0)      return RecordComparator.EQUIVALENT;    else if (comparison < 0)      return RecordComparator.PRECEDES;    else      return RecordComparator.FOLLOWS;  }}<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[],"tags":[],"class_list":["post-317","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/317","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=317"}],"version-history":[{"count":0,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/317\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=317"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.strongd.net\/index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