EBK BIG JAVA: EARLY OBJECTS, INTERACTIV
EBK BIG JAVA: EARLY OBJECTS, INTERACTIV
6th Edition
ISBN: 8220102010314
Author: Horstmann
Publisher: YUZU
Question
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Chapter 21, Problem 2PP
Program Plan Intro

To print letter frequencies

Program plan:

  • In a file “FrequencyMap.java”, create a class “FrequencyMap”,
    • Declare an array variable.
    • Define the constructor to initialize the values.
    • Define the method “getFrequency()” to get the frequency of the specified letter.
    • Define the method “add()” to add a letter to be counted.
  • In a file “FrequencyCounter.java”, import the necessary packages and create a class “FrequencyCounter”,
    • Define the method “main()”,
      • Create a Scanner object.
      • Prompt the user for a file name.
      • Get the file location from the user.
      • Execute “try” statement,
        • Create an object for “FrequencyMap”.
        • Set the Boolean value to “done”.
        • Execute loop if not done,
          • Read the character.
          • If “-1”,
            • Set the Boolean value to true.
          • Otherwise, check if there is a letter,
            • Call the method “add()” to add a letter to be counted.
        • Close he file reader.
        • Execute a loop,
          • Print the frequencies.
      • Catch if exception occurs,
        • Handle the exception.

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