extra-assignment/src/AmusementParks.java

import java.util.Scanner;

abstract class Themepark {
    int afee = 500, cfee = 300;

    int calc(int n, int m) {
        return (n * afee) + (m * cfee);
    }

    abstract void playGame(int j);
}

class Queensland extends Themepark {
    int i;
    Boolean games[] = new Boolean[30];

    Queensland() {
        System.out.println("Welcome to Queensland!");
        for (i = 0; i < games.length; i++) {
            games[i] = false;
        }
    }

    void playGame(int j) {
        if (games[j] == true) {
            System.out.println("Error: You've already played this game");
        } else {
            System.out.println("Playing Game " + j + " at Queensland");
            games[j] = true;
        }
    }
}

class Wonderla extends Themepark {
    int i;
    Boolean games[] = new Boolean[40];

    Wonderla() {
        System.out.println("Welcome to Wonderla!");
        for (i = 0; i < games.length; i++) {
            games[i] = false;
        }
    }

    void playGame(int j) {
        if (games[j] == true) {
            System.out.println("Error: You've already played this game");
        } else {
            System.out.println("Playing Game " + j + " at Queensland");
            games[j] = true;
        }
    }

}

public class AmusementParks {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int i;

        System.out.println("----Welcome to the Amusement Park----");
        System.out.println("Select a park:\n1. Queensland\n2. Wonderla");
        int c = sc.nextInt();

        switch (c) {
            case 1:
                Queensland q = new Queensland();
                System.out.print("Select a game (0 - 29): ");
                while (sc.hasNextInt()) {
                    i = sc.nextInt();
                    q.playGame(i);
                }
                break;

            case 2:
                Wonderla w = new Wonderla();
                System.out.print("Select a game (0 - 39): ");
                while (sc.hasNextInt()) {
                    i = sc.nextInt();
                    w.playGame(i);
                }
                break;

            default:
                System.out.println("Invalid");
                break;
        }
    }
}