JAVAはドメイン名に基づいてipアドレスを取得する

import java.net.*;
public class NetTool{
InetAddress myIPaddress=null;
InetAddress myServer=null;

public static void main( String[] args){
NetTool mytool;
mytool=new NetTool();
String url;
if(args.length>0)
{
url=args[0];
}
else
{
url="www.baidu.com";
}
System.out.println("Your host IP is: " + mytool.getMyIP());
System.out.println("The Server IP is :" +mytool.getServerIP(url));

}

//  LOCALHOST IP  
public InetAddress getMyIP() {
try { myIPaddress=InetAddress.getLocalHost();}
catch (UnknownHostException e) {}
return (myIPaddress);
}
//   www.baidu.com  IP  
public InetAddress getServerIP(String url){
try {myServer=InetAddress.getByName(url);}
catch (UnknownHostException e) {}
return (myServer);
}
}