Capturing the output of a os command line

Question

I need to capture the output of a os command line executed from one java program and I don't know how can do it.
For example:
Runtime.getRuntime().exec("hostid");

Answer 1

Your suggestion worked very well, just in case that this could interest somebody, this is the complete solution
Thanks for your help
import java.io.*;
public class HostID
public static void main(String args[]){
try{
InputStream in = (Runtime.getRuntime().exec("hostid")).getInputStream();
byte[] arreglo= new byte[200];
int cantidad = in.read(arreglo);
System.out.println(new String(arreglo,0,cantidad));
} catch (IOException ioe){System.out.println(ioe.getMessage());}
}