{"id":323,"date":"2007-10-17T00:00:00","date_gmt":"2007-10-17T00:00:00","guid":{"rendered":"http:\/\/www.strongd.net\/?p=323"},"modified":"2007-10-17T00:00:00","modified_gmt":"2007-10-17T00:00:00","slug":"J2ME : Shows the values of the system properties","status":"publish","type":"post","link":"https:\/\/www.strongd.net\/?p=323","title":{"rendered":"J2ME : Shows the values of the system properties"},"content":{"rendered":"

import <\/STRONG><\/FONT>javax.microedition.midlet.*;<\/FONT>
import <\/B><\/FONT>javax.microedition.lcdui.*;<\/FONT>
<\/FONT>
\/**<\/FONT>
 <\/FONT>* A MIDlet shows the values of the system properties.<\/FONT>
 <\/FONT>*\/<\/FONT>
public class <\/B><\/FONT>MIDletProps <\/FONT>extends <\/B><\/FONT>MIDlet <\/FONT>implements <\/B><\/FONT>CommandListener<\/FONT>
{<\/FONT>
<\/FONT>
    <\/FONT>private <\/B><\/FONT>Display display;    <\/FONT>\/\/ The display for this MIDlet<\/FONT>
    <\/FONT>private <\/B><\/FONT>Form props;<\/FONT>
    <\/FONT>private <\/B><\/FONT>StringBuffer propbuf;<\/FONT>
    <\/FONT>private <\/B><\/FONT>Command exitCommand = <\/FONT>new <\/B><\/FONT>Command<\/FONT>(<\/FONT>“Exit”<\/FONT>, Command.SCREEN, <\/FONT>1<\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
<\/FONT>
    <\/FONT>\/**<\/FONT>
    <\/FONT>* Construct MIDletProps<\/FONT>
    <\/FONT>*\/<\/FONT>
    <\/FONT>public <\/B><\/FONT>MIDletProps<\/FONT>() {<\/FONT>
        <\/FONT>display = Display.getDisplay<\/FONT>(<\/FONT>this<\/B><\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>}<\/FONT>
<\/FONT>
    <\/FONT>\/**<\/FONT>
     <\/FONT>* Show the value of the properties<\/FONT>
     <\/FONT>*\/<\/FONT>
    <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>startApp<\/FONT>() {<\/FONT>
       <\/FONT>Runtime runtime = Runtime.getRuntime<\/FONT>()<\/FONT>;<\/FONT>
       <\/FONT>runtime.gc<\/FONT>()<\/FONT>;<\/FONT>
       <\/FONT>long <\/B><\/FONT>free = runtime.freeMemory<\/FONT>()<\/FONT>;<\/FONT>
       <\/FONT>long <\/B><\/FONT>total = runtime.totalMemory<\/FONT>()<\/FONT>;<\/FONT>
    <\/FONT>
       <\/FONT>propbuf = <\/FONT>new <\/B><\/FONT>StringBuffer<\/FONT>( <\/FONT>50 <\/FONT>)<\/FONT>;<\/FONT>
       <\/FONT>props = <\/FONT>new <\/B><\/FONT>Form<\/FONT>( <\/FONT>“System Properties” <\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>
       <\/FONT>props.append<\/FONT>( <\/FONT>“Free Memory = ” <\/FONT>+ free + <\/FONT>“\\n” <\/FONT>)<\/FONT>;<\/FONT>
       <\/FONT>props.append<\/FONT>( <\/FONT>“Total Memory = ” <\/FONT>+ total + <\/FONT>“\\n” <\/FONT>)<\/FONT>;<\/FONT>
    <\/FONT>
       <\/FONT>props.append<\/FONT>( <\/FONT>showProp<\/FONT>( <\/FONT>“microedition.configuration” <\/FONT>) )<\/FONT>;<\/FONT>
       <\/FONT>props.append<\/FONT>( <\/FONT>showProp<\/FONT>( <\/FONT>“microedition.platform” <\/FONT>) )<\/FONT>;<\/FONT>
       <\/FONT>props.append<\/FONT>( <\/FONT>showProp<\/FONT>( <\/FONT>“microedition.locale” <\/FONT>) )<\/FONT>;<\/FONT>
       <\/FONT>props.append<\/FONT>( <\/FONT>showProp<\/FONT>( <\/FONT>“microedition.encoding” <\/FONT>) )<\/FONT>;<\/FONT>
       <\/FONT>props.append<\/FONT>( <\/FONT>showProp<\/FONT>( <\/FONT>“microedition.encodingClass” <\/FONT>) )<\/FONT>;<\/FONT>
       <\/FONT>props.append<\/FONT>( <\/FONT>showProp<\/FONT>( <\/FONT>“microedition.http_proxy” <\/FONT>) )<\/FONT>;<\/FONT>
    <\/FONT>
       <\/FONT>props.addCommand<\/FONT>( <\/FONT>exitCommand <\/FONT>)<\/FONT>;<\/FONT>
       <\/FONT>props.setCommandListener<\/FONT>( <\/FONT>this <\/B><\/FONT>)<\/FONT>;<\/FONT>
       <\/FONT>
       <\/FONT>display.setCurrent<\/FONT>( <\/FONT>props <\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
    <\/FONT>}<\/FONT>
<\/FONT>
    <\/FONT>\/**<\/FONT>
    <\/FONT>* Eventhandling code goes into commandAction<\/FONT>
    <\/FONT>*\/<\/FONT>
    <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>commandAction<\/FONT>( <\/FONT>Command c, Displayable s <\/FONT>) <\/FONT>
    <\/FONT>{<\/FONT>
      <\/FONT>if <\/B><\/FONT>( <\/FONT>c == exitCommand <\/FONT>) <\/FONT>
      <\/FONT>{<\/FONT>
         <\/FONT>destroyApp<\/FONT>( <\/FONT>false <\/B><\/FONT>)<\/FONT>;<\/FONT>
         <\/FONT>notifyDestroyed<\/FONT>()<\/FONT>;<\/FONT>
      <\/FONT>}  <\/FONT>
    <\/FONT>}<\/FONT>
<\/FONT>
<\/FONT>
    <\/FONT>\/**<\/FONT>
     <\/FONT>* Show a property.<\/FONT>
     <\/FONT>*\/<\/FONT>
   <\/FONT>String showProp<\/FONT>( <\/FONT>String prop <\/FONT>) <\/FONT>
   <\/FONT>{<\/FONT>
      <\/FONT>String value = System.getProperty<\/FONT>( <\/FONT>prop <\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>propbuf.setLength<\/FONT>( <\/FONT>0 <\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>propbuf.append<\/FONT>( <\/FONT>prop <\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>propbuf.append<\/FONT>( <\/FONT>” = ” <\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>if <\/B><\/FONT>(<\/FONT>value == <\/FONT>null<\/B><\/FONT>) <\/FONT>
      <\/FONT>{<\/FONT>
         <\/FONT>propbuf.append<\/FONT>( <\/FONT>“<undefined>” <\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>} <\/FONT>
      <\/FONT>else <\/B><\/FONT>
      <\/FONT>{<\/FONT>
          <\/FONT>propbuf.append<\/FONT>( <\/FONT>“\\”” <\/FONT>)<\/FONT>;<\/FONT>
          <\/FONT>propbuf.append<\/FONT>( <\/FONT>value <\/FONT>)<\/FONT>;<\/FONT>
          <\/FONT>propbuf.append<\/FONT>( <\/FONT>“\\”” <\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>}<\/FONT>
      <\/FONT>propbuf.append<\/FONT>( <\/FONT>“\\n” <\/FONT>)<\/FONT>;<\/FONT>
      <\/FONT>return <\/B><\/FONT>propbuf.toString<\/FONT>()<\/FONT>;<\/FONT>
    <\/FONT>}<\/FONT>
<\/FONT>
<\/FONT>
   <\/FONT>\/**<\/FONT>
    <\/FONT>* Time to pause, free any space we don’t need right now.<\/FONT>
    <\/FONT>*\/<\/FONT>
    <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>pauseApp<\/FONT>() <\/FONT>
    <\/FONT>{<\/FONT>
       <\/FONT>display.setCurrent<\/FONT>( <\/FONT>null <\/B><\/FONT>)<\/FONT>;<\/FONT>
       <\/FONT>propbuf = <\/FONT>null<\/B><\/FONT>;<\/FONT>
       <\/FONT>props = <\/FONT>null<\/B><\/FONT>;<\/FONT>
    <\/FONT>}<\/FONT>
<\/FONT>
    <\/FONT>\/**<\/FONT>
     <\/FONT>* No op<\/FONT>
     <\/FONT>*\/<\/FONT>
    <\/FONT>public <\/B><\/FONT>void <\/B><\/FONT>destroyApp<\/FONT>( <\/FONT>boolean <\/B><\/FONT>unconditional <\/FONT>) <\/FONT>
    <\/FONT>{<\/FONT>
       <\/FONT>System.out.println<\/FONT>( <\/FONT>“In destroyApp” <\/FONT>)<\/FONT>;<\/FONT>
<\/FONT>
    <\/FONT>}<\/FONT>
<\/FONT>
}<\/FONT><\/FONT>
<\/FONT>

\n

<\/DIV><\/p>\n","protected":false},"excerpt":{"rendered":"

import javax.microedition.midlet.*;import javax.microedition.lcdui.*;\/** * A MIDlet shows the values of the system properties. *\/public class MIDletProps extends MIDlet implements CommandListener{    private Display display;    \/\/ The display for this MIDlet    private Form props;    private StringBuffer propbuf;    private Command exitCommand = new Command(“Exit”, Command.SCREEN, 1);    \/**    * Construct MIDletProps    *\/    public MIDletProps() {        display = Display.getDisplay(this);    }    \/**     * Show the value of the properties     *\/    public void startApp() {       Runtime runtime = Runtime.getRuntime();       runtime.gc();       long free = runtime.freeMemory();       long total = runtime.totalMemory();           propbuf = new StringBuffer( 50 );       props = new Form( “System Properties” );           props.append( “Free Memory = ” + free + “\\n” );       props.append( “Total Memory = ” + total + “\\n” );           props.append( showProp( “microedition.configuration” ) );       props.append( showProp( “microedition.platform” ) );       props.append( showProp( “microedition.locale” ) );       props.append( showProp( “microedition.encoding” ) );       props.append( showProp( “microedition.encodingClass” ) );       props.append( showProp( “microedition.http_proxy” ) );           props.addCommand( exitCommand );       props.setCommandListener( this );              display.setCurrent( props );    }    \/**    * Eventhandling code goes into commandAction    *\/    public void commandAction( Command c, Displayable s )     {      if ( c == exitCommand )       {         destroyApp( false );         notifyDestroyed();      }      }    \/**     * Show a property.     *\/   String showProp( String prop )    {      String value = System.getProperty( prop );      propbuf.setLength( 0 );      propbuf.append( prop );      propbuf.append( ” = ” );      if (value == null)       {         propbuf.append( “<undefined>” );      }       else       {          propbuf.append( “\\”” );          propbuf.append( value );          propbuf.append( “\\”” );      }      propbuf.append( “\\n” );      return propbuf.toString();    }   \/**    * Time to pause, free any space we don’t need right now.    *\/    public void pauseApp()     {       display.setCurrent( null );       propbuf = null;       props = null;    }    \/**     * No op     *\/    public void destroyApp( boolean unconditional )     {       System.out.println( “In destroyApp” );    }}<\/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-323","post","type-post","status-publish","format-standard","hentry"],"_links":{"self":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/323","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=323"}],"version-history":[{"count":0,"href":"https:\/\/www.strongd.net\/index.php?rest_route=\/wp\/v2\/posts\/323\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=323"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=323"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.strongd.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=323"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}