import org.junit.Test;public class TransIpToLongNumber {    public Long ipToNumber(String ip) {            Long ipLong = 0L;         String[] ipNumbers = ip.split("\\.");        for (String ipNumber : ipNumbers) {            ipLong = ipLong << 8 | Integer.parseInt(ipNumber);        }        return ipLong;       }         @Test    public void trans(){        System.out.println(ipToNumber("192.68.0.1"));        System.out.println(ipToNumber("192.189.2.1"));        System.out.println(ipToNumber("10.189.2.1"));        System.out.println(ipToNumber("10.10.2.1"));    }    }