InetAddress 클래스

주소는 계속 바뀐다.

ip = InetAddress.getLocalHost();

import java.net.*;
import java.util.*;

public class Ex16_1 {

	public static void main(String[] args) {
		InetAddress ip = null; // 객체참조변수 null
		InetAddress[] opArr = null;

		try {
			ip = InetAddress.getByName("www.naver.com"); // naver로 객체를 생성
			System.out.println("getHostName() : " + ip.getHostName());
			System.out.println("getHostAddress() : " + ip.getHostAddress());
			System.out.println("toString() : " + ip.toString());

			byte[] ipAddr = ip.getAddress();
			System.out.println("getAddress() : " + Arrays.toString(ipAddr)); // 2의 보수방식

			String result = "";
			for (int i = 0; i < ipAddr.length; i++)
				result += (ipAddr[i] < 0 ? ipAddr[i] + 256 : ipAddr[i]) + ".";
			// 음수가 나올때만 256을 더한것.
			System.out.println("getAddress()+256 :" + result); // 한개씩 찍어본것
			System.out.println();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
		try {
			ip = InetAddress.getLocalHost();
			System.out.println("getHostName() : " + ip.getHostName());
			System.out.println("getHostAddress() : " + ip.getHostAddress());
			System.out.println();
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
		try {
			InetAddress[] ipArr = InetAddress.getAllByName("www.naver.com");

			for (int i = 0; i < ipArr.length; i++)
				System.out.println("ipArr[" + i + "] : " + ipArr[i]);
		} catch (UnknownHostException e) {
			e.printStackTrace();
		}
	}
}

ip = InetAddress.getLocalHost();