HostLookup.java

package softwareDev;
import java.util.Scanner;
import java.net.InetAddress;
import java.net.UnknownHostException;

public class HostLookup {
	static Scanner sc = new Scanner(System.in);
	
	public static void main(String[] args)
	{
		System.out.println(
				"Welcome to the IP lookup application.");
		String host;
		do
		{
			System.out.println("\nEnter a host name: ");
			host = sc.nextLine();
			try
			{
				InetAddress[] addresses // array of ip addresses
					= InetAddress.getAllByName(host);
				for (InetAddress ip : addresses)
					System.out.println(ip.toString());
			}
			catch (UnknownHostException e)
			{
				System.out.println("Unknown host.");
			}
		} while (doAgain());
	}
	
	private static boolean doAgain()
	{
				System.out.println();
				String s;
				while (true)
				{
					System.out.print("Look up another? "
							+ "(Y or N) ");
					s = sc.nextLine();
					if (s.equalsIgnoreCase("Y"))
						return true;
					else if (s.equalsIgnoreCase("N"))
						return false;
				}
			}
		}