【Java】从域名得到ip

package sdfg;

import java.net.InetAddress;
//import java.net.UnknownHostException;
import java.io.*;

public class sdfg {
    public static void main(String[] args) throws IOException
    {

        String domain="www.google.com";
        FileWriter fw=new FileWriter("add.txt");

        InetAddress[] arr=InetAddress.getAllByName(domain);

        for(int i=0;i<arr.length;i++)
        {
            System.out.println(arr[i]);
            fw.write(arr[i].toString()+'\n');
        }        

        fw.close();
        System.out.println("end");
    }
}