October 6, 2018

Sreekanth B

Write a Java Program to Find Maximum Repeated Words From a File

Program:

Write a program to find maximum repeated words from a file?

Description:

Write a program to read words from a file. Count the
repeated or duplicated words. Sort it by maximum repeated or
duplicated word count.

Code:

package com.java2novice.algos;

import java.io.BufferedReader;
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.StringTokenizer;
import java.util.Map.Entry;

public class MaxDuplicateWordCount {
    
    public Map<String, Integer> getWordCount(String fileName){

        FileInputStream fis = null;
        DataInputStream dis = null;
        BufferedReader br = null;
        Map<String, Integer> wordMap = new HashMap<String, Integer>();
        try {
            fis = new FileInputStream(fileName);
            dis = new DataInputStream(fis);
            br = new BufferedReader(new InputStreamReader(dis));
            String line = null;
            while((line = br.readLine()) != null){
                StringTokenizer st = new StringTokenizer(line, " ");
                while(st.hasMoreTokens()){
                    String tmp = st.nextToken().toLowerCase();
                    if(wordMap.containsKey(tmp)){
                        wordMap.put(tmp, wordMap.get(tmp)+1);
                    } else {
                        wordMap.put(tmp, 1);
                    }
                }
            }
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        } finally{
            try{if(br != null) br.close();}catch(Exception ex){}
        }
        return wordMap;
    }
    
    public List<Entry<String, Integer>> sortByValue(Map<String, Integer> wordMap){
        
        Set<Entry<String, Integer>> set = wordMap.entrySet();
        List<Entry<String, Integer>> list = new ArrayList<Entry<String, Integer>>(set);
        Collections.sort( list, new Comparator<Map.Entry<String, Integer>>()
        {
            public int compare( Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2 )
            {
                return (o2.getValue()).compareTo( o1.getValue() );
            }
        } );
        return list;
    }
    
    public static void main(String a[]){
        MaxDuplicateWordCount mdc = new MaxDuplicateWordCount();
        Map<String, Integer> wordMap = mdc.getWordCount("C:/MyTestFile.txt");
        List<Entry<String, Integer>> list = mdc.sortByValue(wordMap);
        for(Map.Entry<String, Integer> entry:list){
            System.out.println(entry.getKey()+" ==== "+entry.getValue());
        }
    }
}

Output:

one ==== 3
the ==== 3
that ==== 3
of ==== 2
in ==== 2
some ==== 2
to ==== 1
summary ==== 1
but ==== 1
have ==== 1
common ==== 1
least ==== 1
simplest ==== 1


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