waiting threads until it gets value

From:

focode <programarunesh@gmail.com>

Newsgroups:

comp.lang.java.programmer

Date:

Sun, 27 Dec 2009 03:35:02 -0800 (PST)

Message-ID:

<1df528d1-5998-4a6e-ae50-ba40e3ea9df1@x5g2000prf.googlegroups.com>

this problem is related to j2me environment , but threads are every
where hence i am asking it here ...

it goes like this ..
application has to check gprs connection on the mobile , this is done
in separate thread , it is implemented thing like this

public void run() {
try{

String url = "http://www.virtuosos.in/sms/gprs/pushsms_gprs_patna.php?
mobileno=000&msg=INNOLABS%20PATNAMOBILE%20DIRECTORYSEARCH%20STDBYCODE
%200612";

text = gnp.processServerResponse(url).trim(); // seperate class to
fetch url data

System.out.println("value returened = "+text);
}catch(Exception e){}

if(text.equals("error"))
{
// url_hit = "no";
switchDisplayable(null, getPacketdatamissing());
}
else
{
url_hit = "yes";
}

}

"run" method is invoked from here

public void check_gpr() {

     Thread t = new Thread( this );
             t.start();
             if (url_hit.equals("no")) {

                 switchDisplayable(null, getPacketdatamissing());

             } else {

                switchDisplayable(null, getMainMenu());

             }

    }

checking gprs data takes some time , in the mean time
"switchDisplayable(null, getMainMenu());" is called , while the
process of checking gprs continues, and when the application founds
that gprs is not subscribed , it takes appropriate action , (and exits
the program ). what is required is .. until and unless the checking
of gprs is verified , the program should not take any further action ,
and should wait their itself , i think use of "wait" function should
solve my problem , can any one guied me where to put "wait" to solve
this problem, i shall be highly thankfull.

thanks and regards
Arunesh