FileProcessing.java

package org.drip.zen.juice;

import java.io.BufferedReader;
import java.io.FileReader;

/*
 * 1) Number of lines in the file
 * 2) Read the File into a String Array
 * 3) Count the Number of Words in a Single Line
 * 4) Count the Number Words across the full File
 * 5) Display the File Contents
 * 6) Some Notes on Error Handling
 * 7) Exercise - Count the Number of Instances of Occurrence of a Word (example, Romeo)
 * 8) Exercise - Find out the Line that has the most Occurrence of the given Word
 */

public class FileProcessing {

    static int NumberOfLinesInFile (String fullFileName)
        throws Exception
    {
        String line = "";
        int numberOfLines = 1;
        boolean stopReading = false;

        BufferedReader reader = new BufferedReader (new FileReader (fullFileName));

        while (stopReading == false)
        {
            line = reader.readLine();

            if (line == null)
            {
                stopReading = true;
            }
            else
            {
                numberOfLines = numberOfLines + 1;
            }
        }

        reader.close();

        return numberOfLines;
    }

    static String[] ReadFile (String fullFileName)
        throws Exception
    {
        int numberOfLinesToRead = NumberOfLinesInFile (fullFileName);

        String[] fileLines = new String[numberOfLinesToRead];

        String line = "";
        int lineNumber = 0;
        boolean stopReading = false;

        BufferedReader reader = new BufferedReader (new FileReader (fullFileName));

        while (stopReading == false)
        {
            line = reader.readLine();

            if (line == null)
                stopReading = true;
            else
            {
                fileLines[lineNumber] = line;
                lineNumber = lineNumber + 1;
            }
        }

        reader.close();

        return fileLines;
    }

    static int WordCount (String singleLine)
    {
        if (singleLine == null)
        {
            return 0;
        }

        int count = 1;

        for (int letterIndex = 0; letterIndex < singleLine.length(); letterIndex = letterIndex + 1)
        {
            char letter = singleLine.charAt (letterIndex);

            if (letter == ' ')
            {
                count = count + 1;
            }
        }

        return count;
    }

    static String[] Words (String singleLine)
    {
        if (singleLine == null)
        {
            return null;
        }

        String[] wordsInLine = singleLine.split (" ");

        return wordsInLine;
    }

    public static final void main (String[] input)
        throws Exception
    {
        String fileLocation = "C:\\DRIP\\CreditAnalytics\\Daemons\\Feeds\\TextMiner\\RomeoAndJuliet.txt";

        int fileLineCount = NumberOfLinesInFile (fileLocation);

        String[] fileContents = ReadFile (fileLocation);

        int totalWords = 0;

        for (int i = 0; i < fileLineCount; i = i + 1)
        {
            String currentLine = fileContents[i];

            int numberOfWordsInCurrentLine = WordCount (currentLine);

            totalWords = totalWords + numberOfWordsInCurrentLine;

            String[] wordsInCurrentLine = Words (currentLine);

            String wordDump = "";

            for (int j = 0; j < numberOfWordsInCurrentLine; j = j + 1)
            {
                wordDump = wordDump + wordsInCurrentLine[j] + ",";
            }

            System.out.println (wordDump);
        }

        System.out.println ("\tNumber of Lines in File: " + fileLineCount);

        System.out.println ("\tNumber of Words in File: " + totalWords);
    }
}