count occurrences of strings from a text file in Java

Question

I am trying to count the number of occurrences of days of the week in a textfile. As of right now my code counts the total number of occurrences but I need it to count the number of individual occurrences of each keyword. The output needs to look like this

Monday = 1
Tuesday = 2
Wednesday = 0

etc.

Here's my code so far

import java.io.BufferedReader;
import java.io.FileNotFoundException;
import java.io.FileReader;
import java.io.IOException;
import java.util.Map;
import java.util.HashMap;

public class DayCounter
{

public static void main(String args[]) throws IOException 
{

    String[] theKeywords = { "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday", "Sunday"};

    // put each keyword in the map with value 0 
    Map<String, Integer> DayCount = new HashMap<String, Integer>();
    for (String str : theKeywords)
    {
        DayCount.put(str, 0);
    }

    try (BufferedReader br = new BufferedReader(new FileReader("C:\\Eclipse\\test.txt")))
    {

        String sCurrentLine;

        // read lines until reaching the end of the file
        while ((sCurrentLine = br.readLine()) != null) 
        {


            if (sCurrentLine.length() != 0) 
            {

                // extract the words from the current line in the file
                if (DayCount.containsKey(sCurrentLine))
                {
                    DayCount.put(sCurrentLine, DayCount.get(sCurrentLine) + 1);
                }
            }
        }

    } 
    catch (FileNotFoundException exception)
    {

        exception.printStackTrace();
    } 
    catch (IOException exception) 
    {

        exception.printStackTrace();
    } 


    int count = 0;
    for (Integer i : DayCount.values()) 
    {
        count += i;
    }

    System.out.println("\n\nCount = " + count);
}
}

Its working but I can't figure out how to change the output to what I described in the question — user2007843
– user2007843, Commented Mar 5, 2013 at 19:22
what is the output you get? What is your problem? Is there any exception? How the data in the text file are presented? Currently you are reading a line, not a word, in a line there might be number of words — PeakGen
– PeakGen, Commented Mar 5, 2013 at 19:26

sundar · Accepted Answer · 2013-03-05 19:25:22Z

1

Try this instead of just printing the sum :

for(String day : theKeywords) {
 System.out.println(day + " = " + DayCount.get(day));
}

answered Mar 5, 2013 at 19:25

sundar

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6 Comments

user2007843 Over a year ago

Actually if I put the same string on a line it only counts it once(ex. Monday Monday)

sundar Over a year ago

@user2007843 then you need to split the strings, trim them and load into HashMap

user2007843 Over a year ago

sorry can you explain that a little more in depth?

sundar Over a year ago

@user2007843 So instead of checking for if (DayCount.containsKey(sCurrentLine)), use split on sCurrentLine which will give you String[]. Just iterate this array and check if any of these elements exist in DayCount`

user2007843 Over a year ago

is there a way to do this using indexof?

|

seeker · Accepted Answer · 2013-03-05 19:28:15Z

1

You are printing the sum of all the days. Instead you want to print the value for each day. So instead of

  for (Integer i : DayCount.values()) 
    {
        count += i;
    }

You should do

for(String Day: theKeywords) {
 System.out.println(Day+ " = " + DayCount.get(day));
}

answered Mar 5, 2013 at 19:28

seeker

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Comments

niculare · Accepted Answer · 2013-03-05 19:24:16Z

0

Try this:

for (String crtDay : dayCount.keySet())
    System.out.println(String.format("%s = %d", crtDay, dayCount.get(crtDay));

answered Mar 5, 2013 at 19:24

niculare

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Comments

Markus A. · Accepted Answer · 2013-03-05 19:25:24Z

0

Simply do this:

for (Entry<String, Integer> count: DayCount.entrySet())
    System.out.println(count.getKey()+" = "+count.getValue());

answered Mar 5, 2013 at 19:25

Markus A.

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