Added code for hadoop.

Codes/Code-1.4/CharacterCountMapper.java

@@ -0,0 +1,21 @@
+import java.io.IOException;
+import org.apache.hadoop.io.IntWritable;
+import org.apache.hadoop.io.Text;
+import org.apache.hadoop.mapreduce.Mapper;
+
+public class CharacterCountMapper extends Mapper<Object, Text, Text, IntWritable> {
+    private final static IntWritable one = new IntWritable(1);
+    private Text character = new Text();
+
+    @Override
+    protected void map(Object key, Text value, Context context) throws IOException, InterruptedException {
+        String line = value.toString().toLowerCase();
+        for (char c : line.toCharArray()) {
+            if (Character.isAlphabetic(c)) {
+                character.set(String.valueOf(c));
+                context.write(character, one);
+            }
+        }
+    }
+}
+