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/**
 * Reference declaration
 * This program is referenced from http://hadoop.apache.org/docs/r1.0.4/cn/mapred_tutorial.html
 */
package com.tutorialpro.hadoop;
import java.io.IOException;
import java.util.*;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.*;
import org.apache.hadoop.mapred.*;
/**
 * Methods related to `Map`
 */
class Map extends MapReduceBase implements Mapper<LongWritable, Text, Text, IntWritable> {
    private final static IntWritable one = new IntWritable(1);
    private Text word = new Text();
    public void map(LongWritable key,
                    Text value,
                    OutputCollector<Text, IntWritable> output,
                    Reporter reporter)
            throws IOException {
        String line = value.toString();
        StringTokenizer tokenizer = new StringTokenizer(line);
        while (tokenizer.hasMoreTokens()) {
            word.set(tokenizer.nextToken());
            output.collect(word, one);
        }
    }
}
/**
 * Methods related to `Reduce`
 */
class Reduce extends MapReduceBase implements Reducer<Text, IntWritable, Text, IntWritable> {
    public void reduce(Text key,
                       Iterator<IntWritable> values,
                       OutputCollector&lt;Text, IntWritable> output,
                       Reporter reporter)
           throws IOException {
        int sum = 0;
        while (values.hasNext()) {
            sum += values.next().get();
        }
        output.collect(key, new IntWritable(sum));
    }
}
public class MyWordCount {
    public static void main(String[] args) throws Exception {
        JobConf conf = new JobConf(MyWordCount.class);
        conf.setJobName("my_word_count");
        conf.setOutputKeyClass(Text.class);
        conf.setOutputValueClass(IntWritable.class);
        conf.setMapperClass(Map.class);
        conf.setCombinerClass(Reduce.class);
        conf.setReducerClass(Reduce.class);
        conf.setInputFormat(TextInputFormat.class);
        conf.setOutputFormat(TextOutputFormat.class);
        // The first argument represents the input
        FileInputFormat.setInputPaths(conf, new Path(args[0]));
        // The second argument represents the output
        FileOutputFormat.setOutputPath(conf, new Path(args[1]));
        JobClient.runJob(conf);
    }
}

/home/hadoop/MyWordCount/com/tutorialpro/hadoop/MyWordCount.java

cd /home/hadoop/MyWordCount

javac -classpath ${HADOOP_HOME}/share/hadoop/mapreduce/hadoop-mapreduce-client-core-3.1.4.jar -classpath ${HADOOP_HOME}/share/hadoop/client/hadoop-client-api-3.1.4.jar com/tutorialpro/hadoop/MyWordCount.java

jar -cf my-word-count.jar com

hadoop jar my-word-count.jar com.tutorialpro.hadoop.MyWordCount /wordcount/input /wordcount/output2

hadoop fs -cat /wordcount/output2/part-00000

I       4
hadoop  2
like    2
love    2
tutorialpro  2