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Question

I have a problem with java runtime class.
I build a class which is invoked by main class. we i run it solely, which run well. but when it is invoked by main class. the runtime.excu can not finished. I have used process.waitfor, but it is no used in this case. i need your help.
main class:
A2POS pos=new A2POS();
pos.Pos(result1);
subclass:
try
String com= " c:\\jbuilder\\geniatagger-1.0\\geniatagger.exe";
// command + " /c dir > c:\\dir.txt");
//Process process = Runtime.getRuntime().exec("cmd /c start "+com+" ");
String[] a={"c:\\jbuilder\\geniatagger-1.0\\geniatagger.exe","-i question.txt","-o result.txt"};
Process process=null;
process = Runtime.getRuntime().exec
("cmd /c start/wait c:\\jbuilder\\geniatagger-1.0\\geniatagger -i "+Qurl+" -o "+Rurl+"");
process.waitFor();
System.out.println("Notepad returned " + process.exitValue());
catch (Exception e)
e.printStackTrace();
}

Answer 1

You can mean anything you want, but in Java (or general OO) terms, a subclass is a class that extends another class, not a class used from another class. If you want to use different terminology, expect people to misunderstand you.
Furthermore, if there is a difference between how the Runtime.exec() command behaves when run from your main class, compared to when it is run from the other class, there must be a difference in circumstances (different input parameters, different files, whatever). Without the actual code, it is impossible to tell (please use code tags when posting code).
In any case, you need to use the techniques described in the article I posted to prevent the external process from hanging, which would cause the process.waitFor() to wait forever.