I have three classes in my program. Ship.java, Cabin.java and Passenger.java. According to the program a single cabin should hold up to 3 passengers only. But I'm stuck on how to do this. I have created an array of cabin objects in my Ship.java class. I can only add one passenger into a cabin with below mentioned addCustomer method
Cabin[] cruiseShip = new Cabin[12];
for (int i = 0; i < cruiseShip.length; i++) {
cruiseShip[i] = new Cabin();
}
public static void addCustomer(Cabin[] cruiseShip, String firstName, String surName, int expenses, int cabinNumber){
if (cruiseShip[cabinNumber].getCabinName().equals("empty")){
cruiseShip[cabinNumber].setFirstName(firstName);
cruiseShip[cabinNumber].setSurName(surName);
cruiseShip[cabinNumber].setExpenses(expenses);
cruiseShip[cabinNumber].setCabinName("not empty");
System.out.println("Cabin number " + cruiseShip[cabinNumber].getCabinNumber() + " is occupied by " + cruiseShip[cabinNumber].getFirstName() + " " + cruiseShip[cabinNumber].getSurName() );
}
}
This is how Cabin.java looks :
public class Cabin extends Passenger {
int cabinNumber;
String cabinName;
public String getCabinName() {
return cabinName;
}
public void setCabinName(String cabinName) {
this.cabinName = cabinName;
}
public int getCabinNumber() {
return cabinNumber;
}
public void setCabinNumber(int cabinNumber) {
this.cabinNumber = cabinNumber;
}
}
This is how Passenger.java looks :
public class Passenger {
String firstName;
String surName;
int expenses;
public String getFirstName() {
return firstName;
}
public void setFirstName(String firstName) {
this.firstName = firstName;
}
public String getSurName() {
return surName;
}
public void setSurName(String surName) {
this.surName = surName;
}
public int getExpenses() {
return expenses;
}
public void setExpenses(int expenses) {
this.expenses = expenses;
}
}
Cabin should contain a data-structure which holds passengers.(association 1-n, from 1_cabin-N_passengers) You could also restrict the no. of passengers regarding to cabin type (up to 2-3-n passengers) and also check not to add n-times the same passenger in the same cabin for a specific time. Same logic with Ship which have Cabins.
class Cabin
{
... etc ... as u did
List<Passenger> listP = new ArrayList<Passenger>();
}
listP.add(new Passenger(...));
class Ship
{
...
List<Cabin> listC = new ArrayList<Cabin>();
}
listC.add(new Cabin(...));
//get a specific cabin from the ship and add a new Passenger
//note maybe it's better to do your custom methods for add,get_Ship, Cabin (based on the requiremts).
//Standard List Methods usually do not fit exactly custom requirements, so need to be enhanced
ship.getlistC().get(i_specificCabin).listP.add(new Passenger(...));
Be carefully not to mix semantics, think how in real world things works (see @Jim Garrison).
Note: Maybe a Map<String/Integer,CustomObject> can fit well for ease of access based on key(id).