Java - 전화번호 유효성 검사

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class PhoneNumberValidation {

    public static void main(String[] args) {

        String number = "010-1234-5678";
        String number2 = "010-123-45678";
        String number3 = "0101-234-5678";

        validPhoneNumber(number);
        validPhoneNumber(number2);
        validPhoneNumber(number3);
    }

    public static boolean validPhoneNumber(String number) {
        Pattern pattern = Pattern.compile("\\d{3}-\\d{4}-\\d{4}");
        Matcher matcher = pattern.matcher(number);
        if (matcher.matches()) {
            System.out.println("Valid phone number: " + number);
            return true;
        } else {
            System.out.println("Invalid. Not the form XXX-XXXX-XXX: " + number);
            return false;
        }
    }

}

Valid phone number: 010-1234-5678
Invalid. Not the form XXX-XXXX-XXX: 010-123-45678
Invalid. Not the form XXX-XXXX-XXX: 0101-234-5678

// Pattern: 123-456-7890
Pattern pattern = Pattern.compile("\\d{3}-\\d{3}-\\d{4}");

// Pattern: 123-45678910
Pattern pattern = Pattern.compile("\\d{3}-\\d{8}");

// Pattern: 12345678910
Pattern pattern = Pattern.compile("\\d{11}");