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  1. /**
  2. * Created by dan on 6/14/17.
  3. */
  4. public class StringUtilities {
  5. /**
  6. * @return `Hello World` as a string
  7. */
  8. public static String getHelloWorld() {
  9. return "Hello World";
  10. }
  11. /**
  12. * @param firstSegment a string to be added to
  13. * @param secondSegment a string to add
  14. * @return the concatenation of two strings, `firstSegment`, and `secondSegment`
  15. */
  16. public static String concatenation(String firstSegment, String secondSegment){
  17. return firstSegment + secondSegment;
  18. }
  19. /**
  20. * @param firstSegment a string to be added to
  21. * @param secondSegment a string to add
  22. * @return the concatenation of an integer, `firstSegment`, and a String, `secondSegment`
  23. */
  24. public static String concatenation(int firstSegment, String secondSegment){
  25. return firstSegment + secondSegment;
  26. }
  27. /**
  28. * @param input a string to be manipulated
  29. * @return the first 3 characters of `input`
  30. */
  31. public static String getPrefix(String input){
  32. return input.substring(0, 3);
  33. }
  34. /**
  35. * @param input a string to be manipulated
  36. * @return the last 3 characters of `input`
  37. */
  38. public static String getSuffix(String input){
  39. return input.substring(input.length()-3, input.length());
  40. }
  41. /**
  42. * @param inputValue the value to be compared
  43. * @param comparableValue the value to be compared against
  44. * @return the equivalence of two strings, `inputValue` and `comparableValue`
  45. */
  46. public static Boolean compareTwoStrings(String inputValue, String comparableValue){
  47. if (inputValue == comparableValue){
  48. return true;
  49. }
  50. return false;
  51. }
  52. /**
  53. * @param inputValue the value input from user
  54. * @return the middle character of `inputValue`
  55. */
  56. public static Character getMiddleCharacter(String inputValue){
  57. int total = (inputValue.length()) / 2;
  58. if (inputValue.length() % 2 == 0){
  59. total -= 1;
  60. }
  61. return inputValue.charAt(total);
  62. }
  63. /**
  64. * @param spaceDelimitedString a string, representative of a sentence, containing spaces
  65. * @return the first sequence of characters
  66. */
  67. public static String getFirstWord(String spaceDelimitedString){
  68. String first = "";
  69. String space = " ";
  70. for (int i = 0; i < spaceDelimitedString.length(); i++){
  71. if (spaceDelimitedString.charAt(i) == space.charAt(0)){
  72. break;
  73. }
  74. first += spaceDelimitedString.charAt(i);
  75. }
  76. return first;
  77. }
  78. /**
  79. * @param spaceDelimitedString a string delimited by spaces
  80. * @return the second word of a string delimited by spaces.
  81. */
  82. public static String getSecondWord(String spaceDelimitedString){
  83. String second = "";
  84. String space = " ";
  85. boolean word = false;
  86. for (int i = 0; i < spaceDelimitedString.length(); i++){
  87. if (spaceDelimitedString.charAt(i) == space.charAt(0) && word == true){
  88. break;
  89. }
  90. second += spaceDelimitedString.charAt(i);
  91. if (spaceDelimitedString.charAt(i) == space.charAt(0) && word == false){
  92. second = "";
  93. }
  94. }
  95. return second;
  96. }
  97. /**
  98. * @param stringToReverse
  99. * @return an identical string with characters in reverse order.
  100. */
  101. public static String reverse(String stringToReverse){
  102. String reversedStr = "";
  103. reversedStr += stringToReverse.substring(stringToReverse.length());
  104. for (int i = stringToReverse.length() - 1; i >= 0; i--){
  105. reversedStr += stringToReverse.substring(i, i + 1);
  106. }
  107. return reversedStr;
  108. }
  109. }