public String generatePwd1() { SecureRandom

public String generatePwd1() {
  SecureRandom random = new SecureRandom();
  String str1 = new BigInteger(25, random).toString(32);
  String str2 = new BigInteger(25, random).toString(32);
  System.out.println(str1);
  System.out.println(str2);
  return null;
}

http://www.computer-faqs.com/2009/01/16/generate-random-password-in-java/
http://java.developpez.com/faq/java/?page=langage_chaine