Getting input and output from a jar file run from java class?

Posted by Jack L. on Stack Overflow See other posts from Stack Overflow or by Jack L.
Published on 2009-02-14T04:50:32Z Indexed on 2010/04/24 14:43 UTC
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Hi,

I have a jar file that runs this code:

public class InputOutput {

    /**
     * @param args
     * @throws IOException 
     */
    public static void main(String[] args) throws IOException {
    	boolean cont = true;
    	BufferedReader in = new BufferedReader(new InputStreamReader(System.in));
    	while (cont) {
    		System.out.print("Input something: ");
    		String temp = in.readLine();
    		if (temp.equals("end")) {
    			cont = false;
    			System.out.println("Terminated.");
    		}
    		else
    			System.out.println(temp);
    	}
    }
}

I want to program another java class that executes this jar file and can get the input and send output to it. Is it possible? The current code I have is this but it is not working:

public class JarTest {

    /**
     * Test input and output of jar files
     * @author Jack
     */
    public static void main(String[] args) {
        try {
            Process io = Runtime.getRuntime().exec("java -jar InputOutput.jar");
            BufferedReader in = new BufferedReader(new InputStreamReader(io.getInputStream()));
            OutputStreamWriter out = new OutputStreamWriter(io.getOutputStream());
            boolean cont = true;
            BufferedReader consolein = new BufferedReader(new InputStreamReader(System.in));
            while (cont) {
                String temp = consolein.readLine();
                out.write(temp);
                System.out.println(in.readLine());
            }
        } catch (IOException e) {
            e.printStackTrace();
        }

    }
}

Thanks for your help

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