操纵IP地址 - 在'。'上拆分字符串。 字符

Question

String address = "192.168.1.1";

I want to split the address and the delimiter is the point. So I used this code:

String [] split = address.split(".");

But it didn't work, when I used this code it works:

String [] split = address.split("\\.");

so why splitting the dot in IPv4 address is done like this : ("\\\\.") ?

Answer 1

You need to escape the "." as split takes a regex. But you also need to escape the escape as "\\." won't work in a java String :

String [] split = address.split("\\.");

This is because the backslash in a java String denotes the beginning of a character literal .

Answer 2

You should split like this, small tip use Pattern.compile as well

String address = "192.168.1.1";
String[] split = address.split("\\.");// you can replace it with private static final Pattern.