Test

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.util.ArrayList;

public class Test {
    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new FileReader(args[0]));
        String entry;
        ArrayList<Samples> samplesArrayList = new ArrayList<>();
        while((entry = br.readLine()) != null) {
            Samples samples = new Samples(entry);
            samplesArrayList.add(samples);
        }

        for(int index = 1; index < samplesArrayList.size(); ++index) {
            if(merge(index, samplesArrayList)) --index;
        }

        for(Samples samples: samplesArrayList) {
            System.out.println(samples.toString());
        }
    }

    private static boolean merge(int index, ArrayList<Samples> list) {
        Samples prev = list.get(index - 1);
        Samples curr = list.get(index);
        if(curr.getStartTime() == curr.getEndTime() || prev.getStatus().equals(curr.getStatus())) {
            if(prev.getStatus().equals("PENDING") || curr.getStatus().equals("PENDING")) {
                prev.setStatus("PENDING");
            } else prev.setStatus("DONE");
            prev.setEndTime(curr.getEndTime());
            prev.setLastWordIndex(curr.getLastWordIndex());
            list.remove(index);
            return true;
        }
        return false;
    }
}