Elevator Sim, Java

Elevator Sim

//'main' method must be in a class 'Rextester'.
//Compiler version 1.8.0_111

import java.util.*;
import java.lang.*;

class Rextester
{  
    public static void main(String args[])
    {
        System.out.println("Hello, World!");
        
        //create object
        ElevatorOperations obj = new ElevatorOperations("mode1");
        //set mode
        //getRequests
        obj.getRequests();
        //process requests
        obj.processRequests();
        obj.publishResults();
    }
}

class Elevator{
    public int floors_supported;
    private int position;
    public String direction;
    public int floors_travelled;
    public int getPosition(){
        return position;
    }
    public void setPosition(int position){
        this.position = position;
    }
    //returns distance (in floors) from current elevator position
    public int getFloorDistance(int floor){
        return Math.abs(position-floor);
    }
}

class Passenger{
    private int start_floor;
    private int end_floor;
    private int wait_time;
    private int travel_time;
    public Passenger(int start_floor,int end_floor){
        this.start_floor = start_floor;
        this.end_floor = end_floor;
    }
    public int getStartFloor(){
        return start_floor;
    }
    public void setStartFloor(int start_floor){
        this.start_floor = start_floor;
    }
    public int getEndFloor(){
        return end_floor;
    }
    public void setEndFloor(int end_floor){
        this.end_floor = end_floor;
    }
    public int getWaitTime(){
        return end_floor;
    }
    public int getTravelTime(){
        return end_floor;
    }    
}

class ElevatorOperations{
    private String mode;
    List<Passenger> passengers;
    Elevator elevator;
    public ElevatorOperations(String mode){
        this.mode = mode;
        passengers = new ArrayList<>();
        elevator = new Elevator();
    }
    public String getMode(){
        return this.mode;
    }
    public void setMode(String mode){
        this.mode = mode;
    }
    public void getRequests(){
        //Read requests from STDIN/FileSystem
        String requests = "10:8-3;4-6;5-9;5-8";
        
        //add elevator's initial floor
        elevator.setPosition(Integer.parseInt(requests.substring(0,requests.indexOf(":"))));
        System.out.println("Initial Pos: "+elevator.getPosition());
        //get requests
        List<String> req_lst = new ArrayList<>(Arrays.asList(requests.substring(requests.indexOf(":")+1,requests.length()).split(";")));
        
        
        //add passengers to list
        for(String entry:req_lst){
            int start_floor = Integer.parseInt(entry.substring(0,entry.indexOf("-")));
            int end_floor = Integer.parseInt(entry.substring(entry.indexOf("-")+1,entry.length()));
            passengers.add(new Passenger(start_floor,end_floor));
        }
        
    }
    public void processRequests(){
        int floor_count = 0;
        for(Passenger p:passengers){
            floor_count+=elevator.getFloorDistance(p.getStartFloor());
            elevator.setPosition(p.getStartFloor());
            System.out.println("Elevator Pos: "+elevator.getPosition());
            floor_count+=elevator.getFloorDistance(p.getEndFloor());
            elevator.setPosition(p.getEndFloor());
            System.out.println("Elevator Pos: "+elevator.getPosition());
        }
        elevator.floors_travelled = floor_count;
    }
    public void publishResults(){
        System.out.println("Mode "+mode);
        System.out.println("Floors travelled="+elevator.floors_travelled);
    }
}


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