了解 InetAddress

Question

I have this code.It works fine.But I don't understand the meaning of few lines of code.I have written comments next to lines I'm unable to understand.Can anyone please help me with understanding these lines.Thanks in advance :)

import java.net.InetAddress;

public class Netaddress
{
    public static void main(String a[]) throws Exception
      {
          InetAddress c;      //this line
          c =InetAddress.getLocalHost();   //and this one
          System.out.println("Local Address Is :"+c);
          System.out.println("Done!");
      }
}

Answer 1

InetAddress is a class in Java (java.net package). From the javadoc of getLocalHost ( emphasis mine )

Returns the address of the local host . This is achieved by retrieving the name of the host from the system, then resolving that name into an InetAddress. Note: The resolved address may be cached for a short period of time.

If there is a security manager, its checkConnect method is called with the local host name and -1 as its arguments to see if the operation is allowed. If the operation is not allowed, an InetAddress representing the loopback address is returned.