//package com.nowjava;/**来 自 n o w j a v a . c o m**/

public class Main {

public static void main(String[] argv) throws Exception {

String ip = "nowjava.com";

System.out.println(checkIpMask(ip));

}

public static String checkIpMask(String ip) {

String ipParts[] = ip.split("\\.");

if (ipParts.length != 4)

return "IP address must have 4 parts";

String message = checkIpMaskPart(ipParts[0]);

if (message != null)

return message;

message = checkIpMaskPart(ipParts[1]);

if (message != null)

return message;

message = checkIpMaskPart(ipParts[2]);/*时 代 J a v a - nowjava.com 提 供*/

if (message != null)

return message;

message = checkIpMaskPart(ipParts[3]);

if (message != null)

return message;

else

return null;

}

private static String checkIpMaskPart(String part) {

int dash;

if ("*".equals(part))

return null;

dash = part.indexOf('-');

if (dash == -1) {

int value = Integer.parseInt(part);

if (value < 0 || value > 255)

return (new StringBuilder())

.append("Value out of range in '").append(part)

.append("'").toString();

//break MISSING_BLOCK_LABEL_219;

}

int from;

from = Integer.parseInt(part.substring(0, dash));

if (from < 0 || from > 255)

return (new StringBuilder())

.append("'From' value out of range in '").append(part)

.append("'").toString();

int to;

try {

to = Integer.parseInt(part.substring(dash + 1));

if (to < 0 || to > 255)

return (new StringBuilder())

.append("'To' value out of range in '")

.append(part).append("'").toString();

} catch (NumberFormatException e) {

/**代码未完, 请加载全部代码(NowJava.com).**/