blob: 9f13dbfab0112a10dd2bda79815faa5f2b240341 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
|
import java.util.ArrayList;
import java.util.List;
public class Ch2 {
public static void main(String[] args) {
System.out.println(format_phone_number("1-23-45-6"));
System.out.println(format_phone_number("1234"));
System.out.println(format_phone_number("12 345-6789"));
System.out.println(format_phone_number("123 4567"));
System.out.println(format_phone_number("123 456-78"));
}
private static String format_phone_number(String phone) {
phone = phone.replace("-", "").replace(" ", "");
int n = phone.length();
List<String> res = new ArrayList<>();
for (int i = 0; i < n / 3; ++i) {
res.add(phone.substring(i * 3, i * 3 + 3));
}
if (n % 3 == 1) {
res.set(res.size() - 1, res.get(res.size() - 1).substring(0, 2));
res.add(phone.substring(n - 2));
} else if (n % 3 == 2) {
res.add(phone.substring(n - 2));
}
return String.join("-", res);
}
}
|
