Java program to find host name and IP address of local and remote machine

Problem Statement: Many times we need to find the host name and IP address of local and the remote machines. Most importantly I want to do this with a Java program.

Solution: Here is the main class, I have named it as HostNameFinder and to test these methods I've another class called as HostNameFinderTest.

/**
 * 
 * Classname : HostNameFinder.java
 * <b>HostNameFinder<b><br> 
 * <p>
 *     This class helps to get the host name and the IP addresses of the local machine and 
 *     remote machines. It provides static methods that can be used to get the very specific
 *     information such as host name or the IP address.
 * </p>
 * 
 * @author Manohar Negi
 * @version 1.0
 * @since 1.0
 * @see
 * Copyright notice
 *
 * Revision History: 
 *
 * Date            By              Version        Comments
 * ---------------------------------------------------------------------------------
 * Aug 31, 2011    Manohar Negi    1.0            Initial Draft
 * Sep 01, 2011    Manohar Negi    1.1            Modified to include more methods
 *
 **/

package com.mani.util;

import java.net.InetAddress;
import java.net.UnknownHostException;

/**
 * <p>
 * <b>Functional Description:</b>
 * <p>
 * Some Description of the file
 * 
 * Created: Month, Day ,YYYY
 * 
 * @author
 * @version
 */
public class HostNameFinder {

    public static String getMyHostName() {
        String hostname = null;
        try {
            InetAddress addr = InetAddress.getLocalHost();
            hostname = addr.getHostName();
            System.out.println("Host Name = " + hostname);

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

        return hostname;
    }

    public static String getMyIPAddress() {
        String ipAddress = null;
        try {
            InetAddress addr = InetAddress.getLocalHost();
            String ipAddr = addr.getHostAddress();
            System.out.println("IP Address = " + ipAddr.toString());

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

        return ipAddress;
    }

    public static String getIPByAddress(String address) {
        String ipAddress = null;
        try {
            InetAddress addr = InetAddress.getByName(address);
            String ipAddr = addr.getHostAddress();
            System.out.println("IP Address = " + ipAddr.toString());

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

        return ipAddress;
    }

    public static String getHostNameByAdress(String address) {
        String hostname = null;
        try {
            InetAddress addr = InetAddress.getByName(address);
            hostname = addr.getHostName();
            System.out.println("Host Name = " + hostname);

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

        return hostname;
    }

}

Here is the test class.

/**
 * 
 * Classname : HostNameFinderTest.java
 * <b>HostNameFinderTest<b><br> 
 * <p>
 *     This class is to test the methods of HostNameFinder.class
 * </p>
 * 
 * @author Manohar Negi
 * @version 1.0
 * @since 1.0
 * @see
 * Copyright notice
 *
 * Revision History: 
 *
 * Date            By              Version        Comments
 * ---------------------------------------------------------------------------------
 * Aug 31, 2011    Manohar Negi    1.0            Initial Draft
 * Sep 01, 2011    Manohar Negi    1.1            Modified to include more methods
 *
 **/
package com.mani.util;

public class HotmNameFinderTest {

    public static void main(String[] args) {

        /* get the host name for local machine */
        HostNameFinder.getMyHostName();

        /* get the IP for local machine */
        HostNameFinder.getMyIPAddress();

        /* get the host name for localhost */
        HostNameFinder.getHostNameByAdress("localhost");

        /* get the IP for localhost */
        HostNameFinder.getIPByAddress("localhost");

        /* get the host name for www.google.com */
        HostNameFinder.getHostNameByAdress("www.google.com");

        /* get the IP for www.google.com */
        HostNameFinder.getIPByAddress("www.google.com");

    }

}

And here is the output that I got.

Host Name = mani-mac
IP Address = 192.168.2.4
Host Name = localhost
IP Address = 127.0.0.1
Host Name = www.google.com
IP Address = 74.125.236.83