using indexOf and substring to calculate a number

Question

I'm not sure how to go about this, my program is supposed to get the user to input an IP address. the program is then supposed to return a value in decimal notation. e.g 134.115.64.1 is input and 2255699969 is output.

I was wondering if i could store 134,115,64 and 1 in variable. if so, how could i go about it? A link to any sort of tutorial would be great as i haven't managed to find one my self.

Thanks

Answer 1

A trick for parsing IP addresses

BigInteger ip = new BigInteger(1,InetAddress.getByName("134.115.64.1").getAddress());
// or
long ip = InetAddress.getByName("134.115.64.1").hashCode() & 0xffffffffL;

System.out.println(ip);

prints

2255699969

Answer 2

You can do something like :

String str = "134.115.64.1";

String arr[] = str.split("\\.");

int[] ips = new int[arr.length];
for(int i=0; i<arr.length;i++)
    ips[i] = Integer.parseInt(arr[i]);