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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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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