Question

I am using Runtime.getRuntime().exec(test.class) to create a process and launch a test.class file.

test.class:

public class test {
    public static void main(String[] args) {
        doReturn();
    }

    public static String doReturn() {
        System.out.println("printed output");
        return "returned output";
    }
}

in the Java application launching this process, I’d like to retrieve the output of this test.class

The code I use looks like:

Process proc = null;
String[] cmd = { "java", "test"};
proc = Runtime.getRuntime().exec(cmd);

InputStream inputStream = proc.getInputStream();
InputStreamReader inputStreamReader = new InputStreamReader(inputStream);
BufferedReader bufferedReader = new BufferedReader(inputStreamReader);

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

This snippet of code does not work: nothing is printed and I get an Exitvalue of 1 for my process.

=> How should I modify it (and / or modify test.class) to return “printed output” to my java application?
=> Is it possible to return “returned output” as well?

(I am new to Java so could you please be very detailed in your answers! Thx!)

Answer 1

I don’t know what are you want to do but try to remove the .class

String[] cmd = { "java", "test"};