Is coding ok for coursework?

Question

So i have a class with the specifications as so
The Aircraft
This must be an object which contains the passengers.  You must use a Java Collection object (not an array) to hold the Passengers and this must limit the number of passengers either when the maximum seat number is reached (250 for this demo) or if the maximum weight is reached (21300). The aircraft should calculate the fare for each passenger as they are added and keep track of the revenue being generated (total fares of all the passengers).  There are also other things like the aircraft seat number is dependant on the aircraft wait, and there is a rule for the price the Person pays depending on their total weight. This is what i have done
import java.util.*;
public class Aircraft
     private List<Passenger> passengers = new ArrayList<Passenger>();
          public Aircraft(Passenger element)
               this.addPassenger(element);
          public void addPassenger(Passenger element)
               try
                    if (passengers.size()<numberOfSeats() && aircraftWeight()<21300.00)
                         passengers.add(element);
               catch(Exception e)
                    System.out.println(e);
                    System.out.println("Passenger number reached or Passenger total weight reached");
          public double passengerTotalWeight()
               double weight = 0.0;
                    for(Passenger a: passengers)
                         weight = a.getWeight() + a.getLuggage().getWeight();
               return weight;
          public double aircraftWeight()
               double weight = 0.0;
                    for(Passenger a: passengers)
                         weight += passengerTotalWeight();
               return weight;
          public double passengerFair()
               double fair = 400.0;
               double weight = passengerTotalWeight();
                    for(Passenger a: passengers)
                         if(weight >= 50 && weight < 100)
                              fair = 400 + ((weight - 50) * 5);
                         else if(weight >= 100 && weight < 150)
                              fair = 650 + ((weight - 100) * 10);
                         else if(weight > 150)
                              fair = 1150;
               return fair;
          public int numberOfSeats()
               int seats = 250;
               double weight = passengerTotalWeight();
                    if(weight>100)
                         seats = 213;
                    else if(weight>150)
                         seats = 142;
               return seats;
}I just basically wanted to know if the programming and style is ok. I am just a bit unsure whether sections like this
if (passengers.size()<numberOfSeats() && aircraftWeight()<21300.00)Where i am doing it with methods is ok. I am basically looking for the best way to do this class as a professional programmer would. Any advise would be great
cheers

Answer 1

Looking at it, i would say that it is adding 0.0 each time or its going to produce too high a value due to it not being assigned the weight of just one Passenger each time, but the total weight. I havnt got a tester going yet, but i think its really about time i work on that so i can do some println's.
I just thought of somthing else, so i changed my code slightly. The passengerTotalWeight method returns the total weight (their weight plus luggage weight) for a single Passenger (not for all passengers). Its the aircraftWeight method which returns the passengerTotalWeight for all passengers. So for the aircraftWeight method, i didnt think an extended for loop was needed. I also added a new variable. This is how it looks at the moment
public double passengerTotalWeight()
               double weight = 0.0;
                    for(Passenger a: passengers)
                         weight = a.getWeight() + a.getLuggage().getWeight();
               return weight;
          public double aircraftWeight()
               double weight = 0.0;
               double totalWeight = 0.0;
                    for(int x=0; x<=passengers.size(); x++)
                         double newWeight = passengerTotalWeight();
                         totalWeight = weight + newWeight;
               return totalWeight;
          }   Not too sure if i am getting closer. I will start working on a tester.