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How to ping a host?

Since Java 1.5 (Tiger) the InetAddress class introduces an isReachable() method that can be use to ping or check if the address specified by the InetAddress is reachable.

package com.javacoderanch.example.net;

import java.net.InetAddress;

public class PingExample 
{
    public static void main(String[] args)
    {
        try
        {
            InetAddress address = InetAddress.getByName("172.16.2.0");

            // Try to reach the specified address within the timeout
            // periode. If during this periode the address cannot be
            // reach then the method returns false.
            boolean reachable = address.isReachable(10000);

            System.out.println("Is host reachable? " + reachable);
        } catch (Exception e)
        {
            e.printStackTrace();
        }
    }
}