2018-HL-HotelPoints — IB CS HL P2 Option D

Points

public class Points {
    private String memberId;
    private int totalPoints;
    private int bonusPoints;
    private String statusNow;
    private String statusNextYear;
    private Visits[] allVisits = new Visits[366];
    int y; // number of visits this year

// Constructor for new member
    public Points(String id) {
        memberId = id;
        bonusPoints = 0;
        y = 0;
        statusNow = "Bronze";
    }

// Constructor for new member with bonus points
    public Points(String id, int bp) {
        memberId = id;
        bonusPoints = bp;
        y = 0;
        statusNow = "Bronze";
    }

// Accessor methods
    public String getMemberId() { return memberId; }
    public int getBonusPoints() { return bonusPoints; }
    public String getStatusNow() { return statusNow; }

public Visits getAllVisits(int v) {
        return allVisits[v];
    }

public void addVisit(Visits v) {
        allVisits[y] = v;
        y = y + 1;
    }

// Q15(e): isGold() — returns true if current status is "Gold"
    public boolean isGold() {
        return statusNow.equals("Gold");
    }

// Q16(c): calculateTotalPoints()
    // Each day = 1000 points, plus any bonus points
    public int calculateTotalPoints() {
        int total = bonusPoints;
        for (int i = 0; i < y; i++) {
            total += allVisits[i].getDays() * 1000;
        }
        return total;
    }

// Q16(d): daysMissing()
    // Returns extra days needed to keep same status next year
    // Bronze: < 10000 | Silver: 10000-49999 | Gold: >= 50000
    public int daysMissing() {
        int total = calculateTotalPoints();
        int pointsNeeded = 0;
        if (statusNow.equals("Gold")) {
            if (total >= 50000) return 0;
            pointsNeeded = 50000 - total;
        } else if (statusNow.equals("Silver")) {
            if (total >= 10000) return 0;
            pointsNeeded = 10000 - total;
        } else { // Bronze
            return 0; // Can always stay Bronze (no lower tier)
        }
        // Convert points to days (rounding up)
        return (pointsNeeded + 999) / 1000;
    }
}

Visits

Customer

⚡ Java Execution Console

import java.util.ArrayList;
import java.util.LinkedList;

public class Main {
    public static void main(String[] args) {
        System.out.println("===== Hotel Points Demo =====");

// === Create Points objects ===
        Points[] allPoints = new Points[10000];
        allPoints[0] = new Points("m100");
        allPoints[1] = new Points("m101", 5000);
        allPoints[2] = new Points("m102", 2000);

System.out.println("Created Points array with 3 members.");

// === Create Visits and add to Points ===
        Visits v1 = new Visits("h003", 3);
        Visits v2 = new Visits("h013", 1);
        Visits v3 = new Visits("h013", 2);
        Visits v4 = new Visits("h005", 6);
        allPoints[0].addVisit(v1);
        allPoints[0].addVisit(v2);
        allPoints[0].addVisit(v3);
        allPoints[0].addVisit(v4);
        allPoints[1].addVisit(v1);
        allPoints[1].addVisit(new Visits("h004", 6));

allPoints[0].addVisit(new Visits("h001", 2));
        allPoints[1].addVisit(new Visits("h002", 4));
        allPoints[2].addVisit(new Visits("h003", 3));
        allPoints[2].addVisit(new Visits("h005", 8));

// === Q16(b)(i): Trace outputs ===
        System.out.println("\n--- Q16(b): Trace outputs ---");
        System.out.println("Q16(b)(i) allPoints[2].getMemberId(): " + allPoints[2].getMemberId());
        System.out.println("Q16(b)(ii) allPoints[0].getBonusPoints(): " + allPoints[0].getBonusPoints());
        Visits v = allPoints[1].getAllVisits(1);
        System.out.println("Q16(b)(iii) allPoints[1].getAllVisits(1).getDays(): " + (v != null ? v.getDays() : "null"));

// === Q15(e): isGold() ===
        System.out.println("\n--- Q15(e): isGold() ---");
        System.out.println("m100 is Gold? " + allPoints[0].isGold());

// === Q16(c): calculateTotalPoints() ===
        System.out.println("\n--- Q16(c): calculateTotalPoints() ---");
        System.out.println("m100 total points: " + allPoints[0].calculateTotalPoints()
            + " (bonus=" + allPoints[0].getBonusPoints() + ", visits=" + allPoints[0].y + ")");
        System.out.println("m101 total points: " + allPoints[1].calculateTotalPoints()
            + " (bonus=" + allPoints[1].getBonusPoints() + ", visits=" + allPoints[1].y + ")");
        System.out.println("m102 total points: " + allPoints[2].calculateTotalPoints()
            + " (bonus=" + allPoints[2].getBonusPoints() + ", visits=" + allPoints[2].y + ")");

// === Q15(c): Tim's status level ===
        System.out.println("\n--- Q15(c): Tim's status (bonus=1000, stays=2+1+6=9 days) ---");
        Points tim = new Points("tim01", 1000);
        tim.addVisit(new Visits("h001", 2));
        tim.addVisit(new Visits("h002", 1));
        tim.addVisit(new Visits("h003", 6));
        System.out.println("Tim's total points: " + tim.calculateTotalPoints()
            + " → needs >=50000 for Gold, >=10000 for Silver");
        // 1000(bonus) + 9*1000 = 10000 → Silver

// === Q16(d): daysMissing() ===
        System.out.println("\n--- Q16(d): daysMissing() ---");
        Points silverMember = new Points("silver01");
        silverMember.addVisit(new Visits("h001", 5)); // 5000 points
        System.out.println("silver01 (5000pts, status=" + silverMember.getStatusNow()
            + "): need " + silverMember.daysMissing() + " more days for Silver");

Points goldMember = new Points("gold01");
        goldMember.addVisit(new Visits("h001", 20)); // 20000 points
        System.out.println("gold01 (20000pts, status=" + goldMember.getStatusNow()
            + "): need " + goldMember.daysMissing() + " days (but needs 50000 for Gold)");

// === Q18(b): goldMails() demo ===
        System.out.println("\n--- Q18(b): goldMails() demo ---");
        LinkedList<Customer> allCustomers = new LinkedList<>();
        allCustomers.add(new Customer("m100", "m100@hotel.com"));
        allCustomers.add(new Customer("m101", "m101@hotel.com"));
        allCustomers.add(new Customer("m102", "m102@hotel.com"));
        ArrayList<String> goldList = goldMails(allCustomers, allPoints);
        System.out.println("Gold members' emails: " + goldList.size() + " found");

System.out.println("\n=== Demo Complete ===");
    }

// Q18(b): goldMails() — returns emails of all current Gold members
    public static ArrayList<String> goldMails(
            LinkedList<Customer> allCustomers, Points[] allPoints) {
        ArrayList<String> result = new ArrayList<>();
        for (Customer c : allCustomers) {
            for (int i = 0; i < allPoints.length; i++) {
                if (allPoints[i] != null
                        && allPoints[i].getMemberId().equals(c.getMemberId())
                        && allPoints[i].isGold()) {
                    result.add(c.getEmail());
                }
            }
        }
        return result;
    }
}

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