So i am making a little program and having trouble setting the length of the String array to the size a user specifies, how are you mean to assign the value that a user enters to the array length? I have the main class for user input which passes onto a demonstration class to store and run a few different calculations etc. The input of mac_attendee_limit will be the size of the array
Main Class
public class ProgMgmtSys {
private static Scanner sc = new Scanner(System.in);
public static void displayMenu() {
System.out.println("\nMoolort Heritage Railway Demonstration Booking System\n");
System.out.println("Menu");
System.out.println("A: Add Demonstration");
System.out.println("B: Add Attendee");
System.out.println("C: Print Demonstration");
System.out.println("D: Print Attendee");
System.out.println("E: Select & Print Cost");
System.out.println("Q: quit");
System.out.print("Please enter your selection: ");
}
public static void addNewDemonstration(Demonstration demonstration) {
String identifier, title;
double base_fee;
int max_attendee_limit, start_time, duration;
System.out.println("New Demonstration Creater");
System.out.println("Enter an Identifier");
identifier = sc.nextLine();
System.out.println("Enter a Title");
title = sc.nextLine();
System.out.println("Enter the Base Fee");
base_fee = sc.nextDouble();
System.out.println("Enter the Macimum Attendee Limit");
max_attendee_limit = sc.nextInt();
System.out.println("Enter the Start Time");
start_time = sc.nextInt();
System.out.println("Enter the Duration");
duration = sc.nextInt();
demonstration.newDemonstration(identifier, title, base_fee, max_attendee_limit, start_time, duration);
}
public static void newAttendeeBooking(Demonstration demonstration) {
String attendeeName, attendeePhoneNumber, membershipType;
System.out.println("New Attendee Booking");
System.out.println("Enter Attendee Name: ");
attendeeName = sc.nextLine();
System.out.println("Enter Attendee Phone Number: ");
attendeePhoneNumber = sc.nextLine();
System.out.println("Please enter discount type if applicable [concession, fsrs, arhs, mhr]: ");
membershipType = sc.nextLine().toLowerCase();
demonstration.newAttendee(attendeeName, attendeePhoneNumber, membershipType);
}
public static void selectDemonstrationsCost(Demonstration demonstration) {
String discountType;
System.out.println("Please Select the type of discount to see the cost for all demonstrations:");
System.out.print("concession, fsrs, arhs, mhr");
discountType = sc.nextLine().toLowerCase();
demonstration.printDemonstrationsCost(discountType);
}
public static void main(String[] args) {
String choice;
Demonstration demonstration = new Demonstration();
do {
displayMenu();
choice = sc.nextLine().toUpperCase();
switch(choice) {
case "A":
addNewDemonstration(demonstration);
break;
case "B":
newAttendeeBooking(demonstration);
break;
case "C":
demonstration.printDemonstration();
break;
case "D":
demonstration.printAttendee();
break;
case "E":
selectDemonstrationsCost(demonstration);
break;
case "Q":
System.out.println("Goodbye");
break;
default:
System.out.println("Invalid selection. Please try again.");
}
} while (!choice.equals("Q"));
}
}
Demonstration Class
public class Demonstration {
private String identifier;
private String title;
private double base_fee;
private int max_attendee_limit = 0;
private int start_time;
private int duration;
private int newAttendee = 5;
private String attendeeName[] = new String[max_attendee_limit];
private String attendeePhoneNumber[] = new String[max_attendee_limit];
private String membershipType[] = new String[max_attendee_limit];
//Discount charges for all different societies & concession
static final double concession_disc = .10; //10% Disc
static final double fsrs_disc = .20; // 20% Discount
static final double arhs_disc = .25; // 25% Discount
static final double mhr_disc = 1.00; // 100% Discount - FREE
private int i = 0;
public Demonstration() {
}
public void newDemonstration(String identifier, String title, double base_fee, int max_attendee_limit, int start_time, int duration) {
this.identifier = identifier;
this.title = title;
this.base_fee = base_fee;
this.max_attendee_limit = max_attendee_limit;
this.start_time = start_time;
this.duration = duration;
}
public void newAttendee(String attendeeName, String attendeePhoneNumber, String membershipType) {
if (i < newAttendee) {
this.attendeeName[i] = attendeeName;
this.attendeePhoneNumber[i] = attendeePhoneNumber;
this.membershipType[i] = membershipType;
i++;
}
}
public void printDemonstration() {
System.out.println("Identifier: " + identifier);
System.out.println("Title: " + title);
System.out.println("Base Fee: $" + base_fee);
System.out.println("Maximum Attendee Limit: " + max_attendee_limit);
System.out.println("Start Time: " + start_time);
System.out.println("Duration: " + duration);
}
public void printAttendee() {
for (int j=0;j< i;j++){
System.out.println("Attendee Name: " + attendeeName[j]);
System.out.println("Attendee Phone number: " + attendeePhoneNumber[j]);
System.out.println("Membership Type: $" + membershipType[j]);
}
}
}
