Advanced Data Analytics Using Python_ With Machine Learning, Deep Learning and NLP Examples ( 2023)

Chapter 7
Analytics at Scale
public abstract class RootBDAS {
abstract HashMap<String, ArrayList<String>>
mapper_task(String line);
abstract HashMap<String, ArrayList<String>>
reducer_task(String key, ArrayList<String> values);
}
Here is the child class:
import java.util.ArrayList;
import java.util.HashMap;
/**
*
*/
/**
* @author SayanM
*
*/
public final class WordCounterBDAS extends RootBDAS{
@Override
HashMap<String, ArrayList<String>> mapper_task
(String line) {
// TODO Auto-generated method stub
String[] words = line.split(" ");
HashMap<String, ArrayList<String>> result = new
HashMap<String, ArrayList<String>>();
for(String w : words)
{
if(result.containsKey(w))
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