WordCount.java Source code

Introduction

Here is the source code for WordCount.java

Source

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Map;
import java.util.StringTokenizer;

public class WordCount {
    static final Integer ONE = new Integer(1);

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

        Hashtable map = new Hashtable();
        FileReader fr = new FileReader(args[0]);
        BufferedReader br = new BufferedReader(fr);
        String line;
        while ((line = br.readLine()) != null) {
            processLine(line, map);
        }
        Enumeration e = map.keys();
        while (e.hasMoreElements()) {
            String key = (String) e.nextElement();
            System.out.println(key + " : " + map.get(key));
        }
    }

    static void processLine(String line, Map map) {
        StringTokenizer st = new StringTokenizer(line);
        while (st.hasMoreTokens()) {
            addWord(map, st.nextToken());
        }
    }

    static void addWord(Map map, String word) {
        Object obj = map.get(word);
        if (obj == null) {
            map.put(word, ONE);
        } else {
            int i = ((Integer) obj).intValue() + 1;
            map.put(word, new Integer(i));
        }
    }
}