CODEWITHSUNDEEP
java
user3013144
user3013144

Reputation: 61

Relative Frequency Count of letters (a-z) from a text file in Java

My text input file has already been processed and only contains letters (a-z) and spaces. For some reason, when I input a very large text file (about 400 000 word file,as determined via cutting and pasting into MSWord), the relative frequency count fails. but for smaller files it works e.g total character=36. Please can someone tell me where the code is going wrong? 

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;

public class SoloCount {

public static void main(String[] args) throws IOException {
String inputFile = "sampleOutput.txt";


// My array for the a-z (97-122, based on ASCII table )

try {
int[] myArray = new int[26];
BufferedReader readerObject = new BufferedReader(new FileReader(inputFile));
String sCurrentLine="";
sCurrentLine = readerObject.readLine();

for(int i = 0; i<sCurrentLine.length(); i++)  // for each character in the readline                    from the input file, a-z will be counted.
        {
            if (Character.isLetter(sCurrentLine.charAt(i)) == true)     // qualifies characterisa letter and not an empty space.
            {
            char singleLetter = sCurrentLine.charAt(i);
            myArray[(int)(singleLetter)-97] = myArray[(int)(singleLetter)-97] + 1;  // Assigning frequency of a character. 97-122 represents a-z (ASCII table). e.g lowercase c = 97
            }
        }
        readerObject.close();


    //Calculate the total number of characters from the input file.
    double sumOfCharacters= 0;
    for (int i = 0; i < myArray.length; i++) 
    {
        sumOfCharacters += myArray[i];
    }
    System.out.println("The total number of characters in this file is: " + sumOfCharacters);

    //Calculating the realtive frequency.  Divide each occurrence for each letter (a-z) by the sumOfCharacters.
    System.out.printf("%10s%6s%n", "Letter", "%");   //column labels "Letter" and "%"
    System.out.println();
    for (int i = 0; i < myArray.length; i++) 
    {
        char singleLetter = (char)(i + 97);         //converting the decimal ASCII annotation to letters for a-z
        double value = myArray[i];
        System.out.printf("%8s%13f%n",singleLetter,(value/sumOfCharacters)*100);
    }

    } 
catch (FileNotFoundException e) {
        e.printStackTrace();
    }


}

}

Upvotes: 0

Views: 2881

Answers (1)

TR1
TR1

Reputation: 323

You are reading only one line of your file - it could be that there are only 36 characters on the line or there is a newline character after 36 characters.

You can also increase the buffer size of your BufferedReader by passing in a larger initial buffer size - 

BufferedReader readerObject = new BufferedReader(new FileReader(inputFile), 2048);

For more details please see here.

Upvotes: 1

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