问上 关于宽带连接 重复连接 直到第三段ip等于某个值 如何弄呢

package test;import java.io.IOException;import java.net.InetAddress;public class IpTest {    public static void main(String[] args){            boolean key = false;            do{                try {                    Runtime.getRuntime().exec("cmd /c start rasdial \"宽带连接\" /disconnect");                    Runtime.getRuntime().exec("cmd /c start rasdial \"宽带连接\" zhanghao mima");                } catch (IOException ee) {                    ee.printStackTrace();                }                InetAddress[]   mArLocalIP   =   null;                 if(mArLocalIP   ==   null) {                     try {                         mArLocalIP   =   InetAddress.getAllByName(InetAddress.getLocalHost().getHostName());                        String adress = mArLocalIP[0].toString();                        System.out.println(adress);                        String address2 = adress.substring(16, 19);                        System.out.println(address2);                        if (address2.equals("152")){                            key = true;                        }                    }                     catch(Exception   e) {                        System.out.println( "getHostIP   error ");                     }                                     }             }while(key == false);    } }

import java.io.IOException;import java.net.InetAddress;public class Test {    public static void main(String[] args) throws IOException, InterruptedException {        InetAddress addr = InetAddress.getLocalHost();        String ip = addr.getHostAddress().toString();        System.out.println(ip);        while(!"192.168.18.1".equals(ip)){            Process disconnect = Runtime.getRuntime().exec("rasdial.exe 宽带连接 /disconnect");               disconnect.waitFor();               System.out.println("断开");               Process connect = Runtime.getRuntime().exec("rasdial.exe 宽带连接 username password");               connect.waitFor();                 System.out.println("连接");               ip = addr.getHostAddress().toString();        }    }}