import java.io.*;
class Aaa {
    // Storing stream in global variable is bad idea;
    // Here I've used global variable to make example code
    // simple; don't use global variable in the real application

    static InputStream pi;
    public static void main(String args[]) {
	try {
	    Process p;
	    // Spawn the new process running aaa.bat script
	    p = Runtime.getRuntime().exec("aaa.bat");
	    pi = p.getInputStream();
	    
	    // Create thread for intercepting standard output
	    // of the new process; Real application should also
	    // catch standard error - the standard error handler
	    // is omitted in the example for simplicity 
	    Thread t = new Thread(new Runnable() {
		    public void run() {
			int c;
			try {
			    for (;;) {
				c = pi.read();
				if (c<0)
				    break;
				System.out.write(c);
			    }
			} catch (IOException ex) {}
		    }
		});
	    t.start();
	} catch (Exception ex) {
	    System.err.println("Exception "+ex);
	}
    }
}