Chapter 21, Problem 21.8PE

Program Plan Intro

CountOccurenceofWordsfromFile.Java

Program Plan:

• Include a class named “DisplayFrequency”.
  • Import BufferedReader.
  • Import file from io package.
  • Import FileReader from io package.
  • Import exception package.
  • Import java util package.
  • Declare the main() function.
  • Declare a scanner for user input.
  • Prompt the user to input file path.
  • Check if file is present or not.
  • Create a word array.
  • Inside a try block declare “BufferedReader” and create a new String buffer.
    • Split the words using toString() method and append the strings.
  • Catch block is declared to handle the exception.
  • To hold words as key and count as value, a TreeMap is created.
  • Use split method to split words.
  • Convert word to lowercase.
  • Check if length of key is greater than 0.
    • Check if the map contains the key.
    • Insert key into map.
  • Get the key.
  • Update the key value and store the updated value.
  • Display key and value for each entry.
• Create a new text file “file”.
  • Add words into the text file.