How to extract a port from a string?

Question

Java

It has its own scanner that takes IP from a string (there may be many of them) and then does what it needs. So, by default there is port 2222, how to extract from a string, for example 0.0.0.0:2223, this same port 2223 in Java?

Answer 1

String host = "0.0.0.0:2223";
String port = host.substring(host.lastIndexOf(":") + 1);

Answer 2

import java.util.StringTokenizer;
String host = "0.0.0.0:2223";
StringTokenizer stringTokenizer = new StringTokenizer(host, ":");
String IP= stringTokenizer.nextElement().toString();
Integer port = Integer.parseInt(stringTokenizer .nextElement().toString());
Output:
Ip = 0.0.0.0 as a string
port = 2223 as int
StringTokenizer is very convenient when the structure of strings is known, you can break it into small tokens according to various criteria, and then simply expand them into the necessary variables. Well, or just skip)