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  1. public class LoopFun
  2. {
  3. /**
  4. * Given a number, return the factorial of that number.
  5. * For example, given 5, the factorial is 5 x 4 x 3 x 2 x 1 which should return 120.
  6. * @param number
  7. * @return the factorial of the number
  8. */
  9. public int factorial(int number){
  10. int fact=1;
  11. for(int i=1;i<=number;i++){
  12. fact=fact*i;
  13. }
  14. System.out.println("Factorial of "+number+" is: "+fact);
  15. return fact;
  16. }
  17. /**
  18. * Given a phrase, get the acronym of that phrase. Acronym is the combination of
  19. * the first character of each word in upper case.
  20. * For example, given "Ruby on Rails", this method will return "ROR"
  21. * @param phrase
  22. * @return Upper case string of the first letter of each word
  23. */
  24. public String acronym(String phrase) {
  25. String result = phrase.replaceAll("\\B.|\\P{L}", "").toUpperCase();
  26. return result;
  27. }
  28. /**
  29. * To prevent anyone from reading our messages, we can encrypt it so it will only be readable by its
  30. * intended audience. This method encrypt the message by shifting the letter by 3 characters. If the character is
  31. * at the end of the alphabet, it will wraps around.
  32. * For example:
  33. * 'a' => 'd'
  34. * 'w' => 'z'
  35. * 'x' => 'a'
  36. * 'y' => 'b'
  37. * @param word
  38. * @return the encrypted string by shifting each character by three character
  39. */
  40. public String encrypt(String word) {
  41. return null;
  42. }
  43. }