@Test public void getDomainFromEmailAddress_withTLD_shouldReturnDomain() { String result = EmailHelper.getDomainFromEmailAddress("user@domain"); assertEquals("domain", result); }
public static String getDomainFromEmailAddress(String email) { int separatorIndex = email.lastIndexOf('@'); if (separatorIndex == -1 || separatorIndex + 1 == email.length()) { return null; } return email.substring(separatorIndex + 1); }
EmailHelper { public static String getDomainFromEmailAddress(String email) { int separatorIndex = email.lastIndexOf('@'); if (separatorIndex == -1 || separatorIndex + 1 == email.length()) { return null; } return email.substring(separatorIndex + 1); } }
EmailHelper { public static String getDomainFromEmailAddress(String email) { int separatorIndex = email.lastIndexOf('@'); if (separatorIndex == -1 || separatorIndex + 1 == email.length()) { return null; } return email.substring(separatorIndex + 1); } private  EmailHelper(); }
EmailHelper { public static String getDomainFromEmailAddress(String email) { int separatorIndex = email.lastIndexOf('@'); if (separatorIndex == -1 || separatorIndex + 1 == email.length()) { return null; } return email.substring(separatorIndex + 1); } private  EmailHelper(); static String getDomainFromEmailAddress(String email); }
EmailHelper { public static String getDomainFromEmailAddress(String email) { int separatorIndex = email.lastIndexOf('@'); if (separatorIndex == -1 || separatorIndex + 1 == email.length()) { return null; } return email.substring(separatorIndex + 1); } private  EmailHelper(); static String getDomainFromEmailAddress(String email);  }