Code not skipping two words in wordcount program - hadoop

Question

This code counts words and skips two given words(in & of) form a file:-
Please help why it is not skipping these words.
import java.io.IOException;
import java.util.StringTokenizer;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.IntWritable;
import org.apache.hadoop.io.LongWritable;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.Job;
import org.apache.hadoop.mapreduce.Mapper;
import org.apache.hadoop.mapreduce.Reducer;
import org.apache.hadoop.mapreduce.lib.input.FileInputFormat;
import org.apache.hadoop.mapreduce.lib.input.TextInputFormat;
import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
import org.apache.hadoop.mapreduce.lib.output.TextOutputFormat;
class skipwc_mapper extends
Mapper<LongWritable, Text, Text, IntWritable> {
protected void map(LongWritable key, Text value, Context context)
throws IOException, InterruptedException {
String line = value.toString();
StringTokenizer t = new StringTokenizer(line);
Text word = null;
while (t.hasMoreTokens()) {
word = new Text(t.nextToken());
context.write(word, new IntWritable(1));
}
}
}
class skipwc_reducer extends
Reducer<Text, IntWritable, Text, IntWritable> {
protected void reduce(Text key, Iterable<IntWritable> values,
Context context) throws IOException, InterruptedException {
int tot = 0;
if (key.toString() != "in" && key.toString() != "of") {
while (values.iterator().hasNext()) {
tot += values.iterator().next().get();
}
context.write(key, new IntWritable(tot));
}
}
}
public static class skipwc_runner {
public static void main(String[] args) throws IOException,
InterruptedException, ClassNotFoundException {
Configuration conf = new Configuration();
Job job = new Job(conf);
job.setJarByClass(skipwc_runner.class);
job.setOutputKeyClass(Text.class);
job.setOutputValueClass(IntWritable.class);
job.setMapperClass(skipwc_mapper.class);
job.setReducerClass(skipwc_reducer.class);
job.setInputFormatClass(TextInputFormat.class);
job.setOutputFormatClass(TextOutputFormat.class);
FileInputFormat.addInputPath(job, new Path(args[0]));
FileOutputFormat.setOutputPath(job, new Path(args[1]));
System.exit(job.waitForCompletion(true) ? 0 : 1);
}
}
}

Answer 1

Use equals method to compare String like:
if (!"in".equals(key.toString()) && !"of".equals(key.toString()))
Also it would be beneficial if you skip of/in in the mapper rather than reducer as it would efficient to remove the data before sorting and shuffling phase, so you avoid additional IO.