Executing system command and obtaining result in real-time

[Andy McBee]

It's easy to launch some program and then - when this program finishes - get a result (stdout, for instance). I use the following code:

        Process p = Runtime.getRuntime().exec("Process.exe");
        InputStream in = p.getInputStream();
        
        BufferedReader inReader = new BufferedReader(new InputStreamReader(in));
        while (inReader.ready()) {
            System.out.println(inReader.readLine());
        }
        in.close();    

But how can i get stream contents in real time?
Being precise, i have a program that prints a line every n seconds; and i want to launch it from java code and every n seconds process the line it prints.

[Andy McBee]

Ok, i found that problem is somewhere else - this code doesn't print output typically produced by Process.exe - it just exits.

UPD. It does exactly what i need, just a few lines need to be replaced:

String line;
while ( (line = inReader.readLine()) != null) {        
        System.out.println(line);
}

[Campbell Ritchie]

Andy McBee wrote:It's easy to launch some program . . .

Easy? It is usually complicated, and whenever we see people using Runtime.exec() we tell them to search for when Runtime.exec() won't.