My runtime is not throwing any errors. please help.

Question

hi this is part of my code.
try {
Runtime r = Runtime.getRuntime();
Process p = r.exec("fping -c 1 " + laten);
if ((p == null)) {
out.println("Could not connect");
catch (IOException io) {
System.err.println(io.toString());
     out.println(laten +" not a valid IP address");
the String variable laten which is an IP address is 123.123.123.wrong, i made it wrong on purpose to catch errors, but what will p equal if laten can not be fpinged? and is this code correct to catch unpingable IP addresses? thanks in advance.

Answer 1

The returned process is not null, you have to check the return value of the process:
Runtime r = Runtime.getRuntime();
Process p = r.exec("fping -c 1 " + laten);
int returnValue = p.waitFor();
if (returnValue != 0) {
   System.out.println("Could not connect");
}