//package PS2;
import javax.swing.*;

public class ElevatorTest {
    public static void main(String[] args) {
        String text= JOptionPane.showInputDialog("Enter max floor served by elevator");
        int elevatorFloor= Integer.parseInt(text);
        Elevator south= new Elevator(elevatorFloor);
        while (true) {
            text= JOptionPane.showInputDialog("Enter floor to request elevator (-1 to quit)");
            int elevatorRequest= Integer.parseInt(text);
            if (elevatorRequest == -1)
                break;
            else
                south.request(elevatorRequest);
        }
        System.exit(0);
    }
}

class Elevator {
    private int curFloor;
    private int maxFloor;
    private int minFloor;
    
    public Elevator(int maxF, int minF, int curF) {
        maxFloor= maxF;
        minFloor= minF;
        curFloor= curF;
    }
    public Elevator(int maxF, int minF) {      
        maxFloor= maxF;
        minFloor= minF;
        curFloor= minF;
        // Or this(maxF, minF, minF);          
    }
    public Elevator(int maxF) {
        maxFloor= maxF;
        minFloor= 1;
        curFloor= 1;
        // Or this(maxF, 1, 1);
    }
    public void request(int f) {
        if (f < minFloor || f > maxFloor || f == curFloor)
            ;       // Do nothing
        else if (f < curFloor) {     // Elevator must descend
            System.out.println("At floor: " + curFloor);
            while (f < curFloor) {
                curFloor--;
                System.out.println("   Going down past floor: " + curFloor);
            }
            System.out.println("Stop at floor: " + f);
        }
        else {       // Elevator must ascend
            System.out.println("At floor: " + curFloor);
            while (f > curFloor) {
                curFloor++;
                System.out.println("   Going up past floor: " + curFloor);
            }
            System.out.println("Stop at floor: " + f);
        }
    }
}