synchronisation error

[arjun rampal]

Hi I have a file which if exists should print "got it" else it should print "not got it".Gettin boolean value through for this through res.getres().Now follwoing are two files.Issue is when file is there i get the correct message but when file is not there I am not getting any messgae.

//1)
boolean retriev = false;

if(file.exists())
{
retrieve = true;
result.putResult(retrieve);
}

if (retrieved)
{
numberOfAttempts++;
timer.cancel();

}
else
{ 
if(numberOfAttempts >= maximumAttempts)
{
timer.cancel();
}
numberOfAttempts++;


}
}
 
//2)
public class Res
{
private boolean avai = false;

public synchronized boolean getRes()
{ 


while(avai == false)
{
try {
wait();
}catch(InterruptedException e) { }
}
notifyAll();

   return avai;
   
}
 
public synchronized void putRes(boolean result)
{
while (avai == true) {
try {
wait();
} catch (InterruptedException e) { }
}
avai= result;
notifyAll();
 
}
}

[HENRY: Added code tags]
[ October 29, 2006: Message edited by: Henry Wong ]

[Henry Wong]

There is nothing in the example that you've shown that prints either "got it" or "not got it".

Henry

[arjun rampal]

Hi this is third file to get it
if (res.getres()){
System.out.println("got it")

else{
System.out.println(" not got it")
}
where res.getres returning boolean value

[Henry Wong]

The "not got it" message will never print. The reason is because the getres() method will always return true -- while the avai variable is false it will wait.

Henry

[arjun rampal]

Hi how to rectify this
regards