Inherit the io of a subprocess in Java, allowing you to talk through Java to the process in the shell like normal.

TestProcessBuilder.java

import java.lang.ProcessBuilder;
import java.lang.ProcessBuilder.Redirect;

public class TestProcessBuilder
{
    public static void main(String args[])
    {
        try
        {
            ProcessBuilder builder = new ProcessBuilder("fairymax");
            builder.redirectInput(Redirect.INHERIT);
            builder.redirectOutput(Redirect.INHERIT);
            builder.redirectError(Redirect.INHERIT);

            Process subProcess = builder.start();
            subProcess.waitFor();
        }
        catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}