Format phone number

This example will show how to format a phone number with java's String.format and Google's phone number handling library.

Straight up Java

@Test
public void format_phone_number_java () {
    
    String rawNumber = "1234567890";
    
    String formattedNumber = String.format("(%s) %s-%s", 
            rawNumber.substring(0, 3), 
            rawNumber.substring(3, 6), 
            rawNumber.substring(6, 10));
    
    assertEquals("(123) 456-7890", formattedNumber);
}

Google phone number library

@Test
public void format_phone_number_google_libphonenumber () throws NumberParseException {
    
    PhoneNumber phoneNumber = new PhoneNumber();
    phoneNumber.setCountryCode(1);
    phoneNumber.setExtension("12345");
    phoneNumber.setNationalNumber(1234567890);

    PhoneNumberUtil phoneUtil = PhoneNumberUtil.getInstance();
    String formattedPhoneNumber = phoneUtil.format(phoneNumber, PhoneNumberFormat.NATIONAL);

    assertEquals("(123) 456-7890 ext. 12345", formattedPhoneNumber);
}