Host IP Lookup Application - Java Network

Java examples for Network:IP Address

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Description

Host IP Lookup Application

Demo Code

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

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;/*from  w w  w. ja v  a2s  .c  o  m*/
    do {
      System.out.print("\nEnter a host name: ");
      host = sc.nextLine();
      try {
        InetAddress[] 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;
    }
  }
}

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