unix in java example

Hi,

I am running below exam in eclipse

https://www.mkyong.com/java/how-to-execute-shell-command-from-java/

getting below errrors.

Bad option -c.


Usage: ping [-t] [-a] [-n count] [-l size] [-f] [-i TTL] [-v TOS]
            [-r count] [-s count] [[-j host-list] | [-k host-list]]
            [-w timeout] [-R] [-S srcaddr] [-4] [-6] target_name

Options:
    -t             Ping the specified host until stopped.
                   To see statistics and continue - type Control-Break;
                   To stop - type Control-C.
    -a             Resolve addresses to hostnames.
    -n count       Number of echo requests to send.
    -l size        Send buffer size.
    -f             Set Don't Fragment flag in packet (IPv4-only).
    -i TTL         Time To Live.
    -v TOS         Type Of Service (IPv4-only. This setting has been deprecated
                   and has no effect on the type of service field in the IP Header).
    -r count       Record route for count hops (IPv4-only).
    -s count       Timestamp for count hops (IPv4-only).
    -j host-list   Loose source route along host-list (IPv4-only).
    -k host-list   Strict source route along host-list (IPv4-only).
    -w timeout     Timeout in milliseconds to wait for each reply.
    -R             Use routing header to test reverse route also (IPv6-only).
    -S srcaddr     Source address to use.
    -4             Force using IPv4.
    -6             Force using IPv6.

package sample;

import java.io.BufferedReader;
import java.io.InputStreamReader;

public class ExecuteShellComand {

	public static void main(String[] args) {

		ExecuteShellComand obj = new ExecuteShellComand();

		String domainName = "google.com";

		//in mac oxs
		String command = "ping -c 3 " + domainName;

		//in windows
		//String command = "ping -n 3 " + domainName;

		String output = obj.executeCommand(command);

		System.out.println(output);

	}

	private String executeCommand(String command) {

		StringBuffer output = new StringBuffer();

		Process p;
		try {
			p = Runtime.getRuntime().exec(command);
			p.waitFor();
			BufferedReader reader =
                            new BufferedReader(new InputStreamReader(p.getInputStream()));

                        String line = "";
			while ((line = reader.readLine())!= null) {
				output.append(line + "\n");
			}

		} catch (Exception e) {
			e.printStackTrace();
		}

		return output.toString();

	}

}

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please advise