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Friday, 23 January 2015

Read File And Count Occurrence Of Word In Java

Read a file and count the occurrence of word in java

import java.io.File;
import java.io.FileReader;
import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.io.IOException;
import java.util.TreeMap;
import java.util.StringTokenizer;

public class fileRead {

    public static void main(String [] args){

        try{
           
            String textFile ="D:\\workspace\\datastructure\\src\\javaprogram\\test.txt";
            BufferedReader input = new BufferedReader(new FileReader(textFile));
           
            //Creating the Map to store the words and their occurrences
            TreeMap<String, Integer> frequencyMap = new TreeMap<String, Integer>();
            String currentLine = null;
           
            //Reading line by line from the text file
            while((currentLine = input.readLine()) != null){
               
                //Parsing the words from each line
                StringTokenizer parser = new StringTokenizer(currentLine, " \t\n\r\f.,;:!?'\"");
                while(parser.hasMoreTokens()){
                    String currentWord = parser.nextToken();
                   
                    Integer frequency = frequencyMap.get(currentWord);
                    if(frequency == null){
                        frequency = 0;                       
                    }
                    //Putting each word and its occurrence into Map
                    frequencyMap.put(currentWord, frequency + 1);
                }
               
            }
           
            //Displaying the Result
            System.out.println(frequencyMap);
                  
        }catch(IOException ie){
            ie.printStackTrace();
            System.err.println("Your entered path is wrong");
        }       
       
    }
   
}

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