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Semantic Precision** Relationships encode meaning. The difference between "a Car *has* an Engine" (composition) versus "a Car *uses* a GasStation" (dependency) affects how we reason about the system, what invariants we can guarantee, and how the system evolves. **2. Lifecycle Management** Relationships determine object lifecycles. In composition, destroying the whole destroys the parts. In aggregation, parts outlive the container. Getting this wrong leads to memory leaks, dangling references, or inconsistent state. **3. Coupling Control** Different relationship types create different levels of coupling. Dependency is weaker than association, which is weaker than inheritance. Choosing the right relationship type directly affects maintainability and testability. **4. API Design** Relationships dictate your public interfaces. Should `Order.getCustomer()` return a full `Customer` object or just a customer ID? The relationship type guides this decision.73:T505,// Association: Student and Course exist independently // A student can enroll in courses; courses can have students class Course { private courseName: string; private enrolledStudents: Student[] = []; constructor(courseName: string) { this.courseName = courseName; } enrollStudent(student: Student): void { this.enrolledStudents.push(student); // Note: We don't create the student - they exist independently } getEnrolledStudents(): Student[] { return [...this.enrolledStudents]; } } class Student { private studentId: string; private enrolledCourses: Course[] = []; constructor(studentId: string) { this.studentId = studentId; } enrollInCourse(course: Course): void { this.enrolledCourses.push(course); course.enrollStudent(this); } // Student continues to exist even if dropped from all courses dropAllCourses(): void { this.enrolledCourses = []; } } // Usage: Both objects have independent lifecycles const student = new Student("S001"); const course = new Course("Data Structures"); student.enrollInCourse(course); // Deleting the course doesn't delete the student // Deleting the student doesn't delete the course74:T43b,// Association: Doctor and Patient exist independently public class Patient { private String patientId; private String name; private List treatingDoctors = new ArrayList<>(); public Patient(String patientId, String name) { this.patientId = patientId; this.name = name; } public void addDoctor(Doctor doctor) { treatingDoctors.add(doctor); } public List getTreatingDoctors() { return Collections.unmodifiableList(treatingDoctors); } } public class Doctor { private String doctorId; private String specialization; private List patients = new ArrayList<>(); public Doctor(String doctorId, String specialization) { this.doctorId = doctorId; this.specialization = specialization; } public void treatPatient(Patient patient) { patients.add(patient); patient.addDoctor(this); } // Doctor continues to exist even without patients public void retireFromPractice() { patients.clear(); } }75:T5b6,// Aggregation: Playlist aggregates Songs // Songs exist independently and can belong to multiple playlists class Song { constructor( public readonly id: string, public readonly title: string, public readonly artist: string, public readonly durationSeconds: number ) {} } class Playlist { private name: string; private songs: Song[] = []; constructor(name: string) { this.name = name; } // Aggregation: we receive an existing song, we don't create it addSong(song: Song): void { if (!this.songs.find(s => s.id === song.id)) { this.songs.push(song); } } removeSong(songId: string): void { this.songs = this.songs.filter(s => s.id !== songId); // Note: Song still exists after removal from playlist } getTotalDuration(): number { return this.songs.reduce((sum, song) => sum + song.durationSeconds, 0); } } // Usage: Songs have independent lifecycles const song1 = new Song("1", "Bohemian Rhapsody", "Queen", 354); const song2 = new Song("2", "Stairway to Heaven", "Led Zeppelin", 482); const rockPlaylist = new Playlist("Classic Rock"); const favoritesPlaylist = new Playlist("My Favorites"); // Same song in multiple playlists (shared ownership) rockPlaylist.addSong(song1); favoritesPlaylist.addSong(song1); // Deleting playlist doesn't delete songs // Songs persist across playlist deletions76:T524,// Aggregation: Department aggregates Employees // Employees exist independently and can move between departments public class Employee { private final String employeeId; private String name; private Department currentDepartment; public Employee(String employeeId, String name) { this.employeeId = employeeId; this.name = name; } public void setDepartment(Department dept) { this.currentDepartment = dept; } public String getEmployeeId() { return employeeId; } } public class Department { private String name; private List employees = new ArrayList<>(); public Department(String name) { this.name = name; } // Aggregation: Employee passed in, not created here public void addEmployee(Employee employee) { employees.add(employee); employee.setDepartment(this); } public void removeEmployee(Employee employee) { employees.remove(employee); employee.setDepartment(null); // Employee still exists after removal! } // Even if department is dissolved, employees continue to exist public void dissolve() { for (Employee emp : employees) { emp.setDepartment(null); } employees.clear(); } }77:T614,// Composition: Order owns OrderItems exclusively // OrderItems cannot exist without their parent Order class OrderItem { constructor( public readonly productId: string, public readonly productName: string, public readonly quantity: number, public readonly unitPrice: number ) {} getSubtotal(): number { return this.quantity * this.unitPrice; } } class Order { private readonly orderId: string; private readonly items: OrderItem[] = []; private readonly createdAt: Date; constructor(orderId: string) { this.orderId = orderId; this.createdAt = new Date(); } // Composition: We CREATE the OrderItem here // It's not passed in from outside addItem(productId: string, name: string, qty: number, price: number): void { const item = new OrderItem(productId, name, qty, price); this.items.push(item); } getTotal(): number { return this.items.reduce((sum, item) => sum + item.getSubtotal(), 0); } getItems(): ReadonlyArray { return this.items; } // When order is cancelled/deleted, all items are gone // There's no separate "delete item and it still exists" operation } // Usage demonstrates exclusive ownership const order = new Order("ORD-001"); order.addItem("PROD-1", "Keyboard", 2, 49.99); order.addItem("PROD-2", "Mouse", 1, 29.99); // Items are PART OF the order // If order is deleted, items are deleted // Items cannot be "moved" to another order78:T52a,// Composition: House owns Rooms exclusively // Rooms cannot exist without their containing House public class Room { private final String name; private final double areaSqFt; private final RoomType type; // Package-private: only House can create rooms Room(String name, double areaSqFt, RoomType type) { this.name = name; this.areaSqFt = areaSqFt; this.type = type; } public String getName() { return name; } public double getAreaSqFt() { return areaSqFt; } } public class House { private final String address; private final List rooms = new ArrayList<>(); public House(String address) { this.address = address; } // Composition: House creates and owns the room public Room addRoom(String name, double area, RoomType type) { Room room = new Room(name, area, type); rooms.add(room); return room; } public double getTotalArea() { return rooms.stream() .mapToDouble(Room::getAreaSqFt) .sum(); } public List getRooms() { return Collections.unmodifiableList(rooms); } // When house is demolished, all rooms cease to exist // There's no concept of "moving a room to another house" }79:T604,// Dependency: ReportGenerator uses DateFormatter // No persistent reference - just uses it when needed interface DateFormatter { format(date: Date): string; } class ISODateFormatter implements DateFormatter { format(date: Date): string { return date.toISOString(); } } class HumanReadableDateFormatter implements DateFormatter { format(date: Date): string { return date.toLocaleDateString('en-US', { weekday: 'long', year: 'numeric', month: 'long', day: 'numeric' }); } } class ReportGenerator { // No field storing DateFormatter - that would be association // Dependency: DateFormatter is received as parameter generateReport(data: ReportData, formatter: DateFormatter): string { const formattedDate = formatter.format(new Date()); return `Report generated on: ${formattedDate} ${data.content}`; } // Another form of dependency: using a static method generateQuickReport(data: ReportData): string { // Depends on Date class const timestamp = new Date().getTime(); return `Quick Report [${timestamp}]: ${data.summary}`; } } // Dependency allows flexibility - different formatters can be used const generator = new ReportGenerator(); const data = { content: "Sales figures...", summary: "Q4 Report" }; const isoReport = generator.generateReport(data, new ISODateFormatter()); const readableReport = generator.generateReport(data, new HumanReadableDateFormatter());7a:T4f5,// Dependency: OrderService uses EmailSender // Transient relationship - no field reference public interface EmailSender { void send(String to, String subject, String body); } public class SmtpEmailSender implements EmailSender { @Override public void send(String to, String subject, String body) { // SMTP implementation } } public class OrderService { // Note: No EmailSender field - pure dependency // Dependency via method parameter public void processOrder(Order order, EmailSender emailSender) { // Process the order... order.setStatus(OrderStatus.CONFIRMED); // Use the email sender (dependency) emailSender.send( order.getCustomerEmail(), "Order Confirmed", "Your order " + order.getId() + " has been confirmed." ); // EmailSender is not stored - relationship ends when method returns } // Dependency via local variable public void generateInvoice(Order order) { // Depends on InvoiceFormatter InvoiceFormatter formatter = InvoiceFormatterFactory.create(); String invoice = formatter.format(order); // formatter goes out of scope - no persistent relationship } }7b:T6ba,// Inheritance: Different payment methods inherit from base abstract class PaymentMethod { protected readonly id: string; protected readonly createdAt: Date; constructor(id: string) { this.id = id; this.createdAt = new Date(); } abstract processPayment(amount: number): Promise; abstract validate(): boolean; // Shared behavior getPaymentMethodId(): string { return this.id; } } class CreditCard extends PaymentMethod { constructor( id: string, private cardNumber: string, private expiryMonth: number, private expiryYear: number, private cvv: string ) { super(id); } validate(): boolean { const now = new Date(); const expiry = new Date(this.expiryYear, this.expiryMonth - 1); return expiry > now && this.cardNumber.length === 16; } async processPayment(amount: number): Promise { // Credit card specific processing return { success: true, transactionId: `CC-${Date.now()}` }; } // Credit card specific method getMaskedNumber(): string { return `****-****-****-${this.cardNumber.slice(-4)}`; } } class BankTransfer extends PaymentMethod { constructor( id: string, private routingNumber: string, private accountNumber: string ) { super(id); } validate(): boolean { return this.routingNumber.length === 9; } async processPayment(amount: number): Promise { // Bank transfer specific processing return { success: true, transactionId: `BT-${Date.now()}` }; } }7c:T67c,// Realization: Classes implement the Repository interface interface Repository { findById(id: ID): Promise; findAll(): Promise; save(entity: T): Promise; delete(id: ID): Promise; } // PostgreSQL implementation class PostgresUserRepository implements Repository { constructor(private pool: Pool) {} async findById(id: string): Promise { const result = await this.pool.query( 'SELECT * FROM users WHERE id = $1', [id] ); return result.rows[0] ?? null; } async findAll(): Promise { const result = await this.pool.query('SELECT * FROM users'); return result.rows; } async save(user: User): Promise { // PostgreSQL-specific save logic return user; } async delete(id: string): Promise { const result = await this.pool.query( 'DELETE FROM users WHERE id = $1', [id] ); return result.rowCount > 0; } } // In-memory implementation for testing class InMemoryUserRepository implements Repository { private users: Map = new Map(); async findById(id: string): Promise { return this.users.get(id) ?? null; } async findAll(): Promise { return Array.from(this.users.values()); } async save(user: User): Promise { this.users.set(user.id, user); return user; } async delete(id: string): Promise { return this.users.delete(id); } 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