CR-MicroLabs-Arrays-StringArrayUtilities

Building Utility Class for String Array Objects

• Objective

  • Ensure StringArrayUtilsTest passes each test by completing the methods stubbed out in the class StringArrayUtils
    • int getNumberOfOccurrences(String[] stringArray, String stringToCheck)
    • boolean contains(String[] stringArray, String stringToCheck)
    • String[] removeValue(String[] stringArray, String stringToRemove)
      

• Purpose

  • To establish greater familiarity with loops and arrays.
  • To demonstrate the implementation of a Utility class
    
    

removeValues(array, valueToRemove)

• Description
  • Given an array of String objects named array and a String object named valueToRemove
    create and return an array containing identical contents excluding objects whose value is equivalent to valueToRemove. Ensure that the length of the newly created array has been resized based on the removal of the undesired elements.
    

Example 1

• Sample Script

  // : Given
  String[] array = {"aba", "aba", "baa", "bab", "bba", "bba", "bba", "bba", "bbb", "bbb"};
      
  // : When
  String[] actual = StringArrayUtils.removeValues(array, "aba");
      
  // : Then
  System.out.println(Arrays.toString(actual));
  

• Sample Output

  [baa, bab, bba, bba, bba, bba, bbb, bbb};
  

Example 2

• Sample Script

  // : Given
  String[] array = {"aba", "aba", "baa", "bab", "bba", "bba", "bba", "bba", "bbb", "bbb"};
      
  // : When
  String[] actual = StringArrayUtils.removeValues(array, "bba");
      
  // : Then
  System.out.println(Arrays.toString(actual));
  

• Sample Output

  [aba, aba, baa, bab, bbb, bbb];
  

Example 3

• Sample Script

  // : Given
  String[] array = {"aba", "aba", "baa", "bab", "bba", "bba", "bba", "bba", "bbb", "bbb"};
      
  // : When
  String[] actual = StringArrayUtils.removeValues(array, "bbb");
      
  // : Then
  System.out.println(Arrays.toString(actual));
  

• Sample Output

  [aba, aba, baa, bab, bba, bba, bba, bba];
  

getNumberOfOccurrences(array, value)

• Description
  • Given an array of String objects named array and a String object named value
    return the number of times value appears in arrays

Example 1

• Sample Script

  // : Given
  String[] array = {"aba", "aba", "baa", "bab", "bba", "bba", "bba", "bba", "bbb", "bbb"};
      
  // : When
  int numberOfOccurrences = StringArrayUtils.getNumberOfOccurrences(array, "bba");
      
  // : Then
  System.out.println(numberOfOccurrences);
  

• Sample Output

  4
  

Example 2

• Sample Script

  // : Given
  String[] array = {"aba", "aba", "baa", "bab", "bba", "bba", "bba", "bba", "bbb", "bbb"};
      
  // : When
  int numberOfOccurrences = StringArrayUtils.getNumberOfOccurrences(array, "bbb");
      
  // : Then
  System.out.println(numberOfOccurrences);
  

• Sample Output

  2
  

Example 3

• Sample Script

  // : Given
  String[] array = {"aba", "aba", "baa", "bab", "bba", "bba", "bba", "bba", "bbb", "bbb"};
      
  // : When
  int numberOfOccurrences = StringArrayUtils.getNumberOfOccurrences(array, "baa");
      
  // : Then
  System.out.println(numberOfOccurrences);
  

• Sample Output

  1
  

contains(array, value)

• Description

  • Given an array of String objects named array and a String object named value
    return true if value appears in arrays.

    Example 1

• Sample Script

  // : Given
  String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
      
  // : When
  boolean outcome = StringArrayUtils.contains(array, "the");
      
  // : Then
  System.out.println(outcome);
  

• Sample Output

  true
  

Example 2

• Sample Script

  // : Given
  String[] array = {"the", "quick", "brown", "fox", "jumps", "over", "the", "lazy", "dog"};
      
  // : When
  boolean outcome = StringArrayUtils.contains(array, "potatoes");
      
  // : Then
  System.out.println(outcome);
  

• Sample Output

  false