Activity.java

package ESGI;

/**
 * Created by Vincent on 23/01/2017.
 */
public class Activity {
    String type;
    int begin;
    int end;

    public Activity(String type, int begin, int end) {
        this.type = type;
        this.begin = begin;
        this.end = end;
    }

    @Override
    public String toString() {
        return type + " : from " + begin + " to " + end;
    }
}

Affectation.java

package ESGI;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Vincent on 03/01/2017.
 */
public class Affectation {
    Worker worker;
    String date;
    String task;

    public Affectation(Worker worker, String date, String task) {
        this.worker = worker;
        this.date = date;
        this.task = task;
    }
}

CSVLog.java

package ESGI;

/**
 * Created by Vincent on 23/01/2017.
 */
public class CSVLog {

    public Factory factory;

    public CSVLog(Factory factory){
        this.factory = factory;
    }

    public void writeCSVLog(){
        for(Affectation affectation : factory.list) {
            for(Activity activity : affectation.worker.activities){
                System.out.println(affectation.task+";"+affectation.date+";"+affectation.worker.name+";"+activity.type+";"+activity.begin+";"+activity.end);
            }
        }
    }
}

Factory.java

package ESGI;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Vincent on 03/01/2017.
 */
public class Factory {

    public List<Affectation> list;

    public Factory () {
        list = new ArrayList<Affectation>();
    }

    public void affect(Worker worker, String date, String task){
        for(Affectation a : list){
            if(worker.name.equals(a.worker.name)){
                a.date = date;
                a.task = task;
                return;
            }
        }
        list.add(new Affectation(worker, date, task));
    }

    public void task1(Worker worker, String date) {
        affect(worker, date, "task1");
    }

    public void task2(Worker worker, String date) {
        affect(worker, date, "task2") ;
    }

    public void task3(Worker worker, String date){
        affect(worker, date, "task3");
    }
}

HumanWorker.java

package ESGI;

/**
 * Created by Vincent on 23/01/2017.
 */
public class HumanWorker extends Worker {

    public HumanWorker(String name){
        super(name);
    }

    @Override
    public void work(int begin, int end) {
        addActivity("work", begin, end);
    }

    public void eat(int begin, int end) {
        addActivity("eat", begin, end);
    }

    public void sleep(int begin, int end) {
        addActivity("sleep", begin, end);
    }

    public void other(int begin, int end) {
        addActivity("other", begin, end);
    }

    public void addActivity(String type, int begin, int end){
        activities.add(new Activity(type, begin, end));
    }
}

Main.java

package ESGI;

/*
https://gist.github.com/rhwy/dddf59092302df5b4a54951ab61576ca
https://gist.github.com/rhwy/077d216484487672fd3c029af4a601a2
 */

public class Main {

    public static void main(String[] args) {
	    Factory factory = new Factory();
        HumanWorker Charles = new HumanWorker("Charles");
        factory.affect(Charles, "01/12/2017", "task1");
        Charles.work(8, 20);
        Charles.sleep(20, 8);
        RobotWorker BB8 = new RobotWorker("BB8");
        factory.affect(BB8, "01/12/2017", "task2");
        BB8.work(8, 20);
        BB8.standby(20, 8);

        CSVLog csvLog = new CSVLog(factory);
        csvLog.writeCSVLog();
    }
}

RobotWorker.java

package ESGI;

/**
 * Created by Vincent on 23/01/2017.
 */
public class RobotWorker extends Worker {

    public RobotWorker(String name){
        super(name);
    }

    @Override
    public void work(int begin, int end) {
        addActivity("work", begin, end);
    }

    public void standby(int begin, int end) {
        addActivity("standby", begin, end);
    }

    public void addActivity(String type, int begin, int end){
        activities.add(new Activity(type, begin, end));
    }
}

Worker.java

package ESGI;

import java.util.ArrayList;
import java.util.List;

/**
 * Created by Vincent on 03/01/2017.
 */
public abstract class Worker {

    public String name;
    public List<Activity> activities;

    public Worker(String name) {
        this.name = name;
        activities = new ArrayList<Activity>();
    }

    public abstract void work(int begin, int end);
}