Problem in getHostAddress() method in java

@manish-r2Hoep • Oct 22, 2024

Oct 22, 2024

1.1K

I am trying to create a simple program that will return the address of host ie my computer

but it gives me exception null

I don't understand why?

here is my code

import java.net.*;
class Myserver
{
public static void main(String args[])
{
InetAddress is=null;
try
{
String st=is.getHostName();
System.out.println("Host address is "+st);
}
catch(Exception e)
{
System.out.println(e.getMessage());}
}
}

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bharathpb

@bharathpb-FtEhYi • Jun 7, 2010

Not sure wats going wrong in ur code..

InetAddress is=null; is setting the address to null...finally u get null.

I tried a new code..try this one...

import java.net.*;
class Myserver1
{
public static void main(String args[])
{

try
{ InetAddress addr = InetAddress.getLocalHost();

System.out.println("Host address is " +addr);
} catch (UnknownHostException e) {
System.out.println(e.getMessage());}
}
}

0
Manish Goyal

@manish-r2Hoep • Jun 7, 2010

Thanks for your response

but still i am not getting same exception

one thing is it possible to retrieve ip address that is allocated to me by my isp through this method ?

0
bharathpb

@bharathpb-FtEhYi • Jun 7, 2010

hi Goyal,

from my above code..you will get both the system hostname and ip address allotted to u.

Also post the exact exception so that i can debug...

0
Manish Goyal

@manish-r2Hoep • Jun 8, 2010

nothing it just print null on console

I don't understand what is the problem ?

should i need to change my network settings?

Do you use broadband?if yes then you program gives which ip address ?I mean that which was allocated by isp or any other?

0
sookie

@sookie-T06sFW • Jun 8, 2010

Hi goyal420,

I am using broadband connection and if I run bharathpb's program in my machine, it is working fine. It shows my machine's [hostname]/[ipaddress provided by ISP] in the output. I think you should once check network settings in your machine.

0
Manish Goyal

@manish-r2Hoep • Jun 8, 2010

Thanks Guys for your reply

now i am getting my ip address

but why my program is not working ?I don't think that there is any syntax error but still there is a exception😕😕

0
bharathpb

@bharathpb-FtEhYi • Jun 8, 2010

goyal,,

As already mentioned by me..provide the exact exception which you are getting...is it null pointer exception or is your output simply null????

0
Manish Goyal

@manish-r2Hoep • Jun 8, 2010

yes it simply output null in case of my first program

0