28
Zadanie
Java Collections, poziom 2, lekcja 6
Password generator
Implement the getPassword() method, which must return a ByteArrayOutputStream with the bytes comprising the password.
Password requirements:
1) 8 characters.
2) Only numbers and uppercase and lowercase Latin letters.
3) At least one numeral, one lowercase letter, and one uppercase letter.
14
Zadanie
Java Collections, poziom 2, lekcja 6
Data integrity
Imagine this situation: you're downloading a zip file from the Internet and in the middle of the download you lose your connection for a few seconds.
You need to be sure that the downloaded zip file is valid. To do this, check its MD5 hash.
Read about MD5 on Wikipedia.
Read about MessageDigest.