adding get mothods to a class extending thread

here is what i am trying to do...

i have a class to run system commands which extending the Thread class.
inside this class, a method called getOutput() that should return a string with the result.

the commands run successfully with no problems. all i want to do is to get the output stream in a string...


Thread t1 = new Command();
t1.getOutput(); // --> Not working of course because it is not a method of the thread class

Q: is that possible to do in another way... giving that the class extends Thread

Thanks

Hello,

How are you executing these system commands?

How are you actually feeding your results into the output variable?

// Json

Hello Json, sorry i was away for the last couple of days...

anyways, i have the following class, used to get the ls (unix command) of a file

public class TestGetDate {
String result;
String file;
Process p;
BufferedReader stdInput;
String s;
String awk;
String[] command;
public TestGetDate(String file) throws IOException{
super();
this.file = file;

p = Runtime.getRuntime().exec("ls -l " + file);
stdInput = new BufferedReader(new InputStreamReader(p.getInputStream()));
result = "";
while (!procDone(p)) {
while((s=stdInput.readLine()) !=null){


result = result+s;
}
setOutput(result);

}
System.out.println(result);
stdInput.close();

}

private boolean procDone(Process p) {
try {
int v = p.exitValue();
return true;
}
catch(IllegalThreadStateException e) {
return false;
}
}
public void setOutput(String result){
this.result = result;
}
public String getOutput(){
return result;
}

}

i want this class to run as a thread but when i do, i cannot run the getOutput() method.

any ideas?

Thanks anyway

I think it's because of how Java handles multi-threading... They have a very strict lock mechanism that prevents almost any chance of dual access, deadlocking, or an such other strange things associate with multi-threading. You can read Sun Java's Tutorial on Concurrency, but it's fairly hard to follow unless you have a fairly good knowledge of computer science and/or java.

Make you class extend Thread. then instead of calling it using Thread t1 = new Command();

You would do something like this, if command is the class you want to run as a thread, such as your TestGetDate class.

Code :

---

Command c1 = new Command();
c1.start();

---

If I understood your problem correctly, then you can call c1.getOutput();

Regards,
Chri

Thanks Freaky Chris, it works like a charm.

:)

Excellent Glad I could help :)

Chris