Java program to test whether server is reachable ?

import java.net.InetAddress;
 
public class PingExample
{
    public static void main(String[] args)
    {
        try
        {
            InetAddress address = InetAddress.getByName("127.0.0.1");
    
            /**
             * FROM JAVADOC
             *
             * Test whether that address is reachable. Best effort is made by the
             * implementation to try to reach the host, but firewalls and server
             * configuration may block requests resulting in a unreachable status
             * while some specific ports may be accessible.
             * A typical implementation will use ICMP ECHO REQUESTs if the
             * privilege can be obtained, otherwise it will try to establish
             * a TCP connection on port 7 (Echo) of the destination host.
             * <p>
             * The timeout value, in milliseconds, indicates the maximum amount of time
             * the try should take. If the operation times out before getting an
             * answer, the host is deemed unreachable. A negative value will result
             * in an IllegalArgumentException being thrown.
             *
             * @param    timeout    the time, in milliseconds, before the call aborts
             * @return a <code>boolean</code> indicating if the address is reachable.
             * @throws IOException if a network error occurs
             * @throws  IllegalArgumentException if <code>timeout</code> is negative.
             * @since 1.5
             */
            boolean reachable = address.isReachable(10000);
            System.out.println("Is host reachable? " + reachable);
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}