// Java Program to Illustrate Difference between Aggregation and Composition // Class 1 // Engine class which will be used by car // and Car class will have a field/attribute of Engine type.

class Engine { // Method to starting an engine public void work(){ System.out.println("Engine of car has been started "); } }

// Class 2 // Engine class

class Car { // Composition private Engine engine; // Constructor Car(Engine engine){ this.engine = engine; } public void move(){ engine.work(); System.out.println("Car is moving "); } }

// Class 3 // Main class

public class Main{ public static void main(String[] args) { // Making an engine by creating // an instance of Engine class. Engine engine = new Engine(); // Making a car with engine // passing a engine instance as an argument // while creating instance of Car Car car = new Car(engine); // Making car to move //by calling move() method inside main() car.move(); } }

1. Compile and run the program to get the output. Explain the output.

2. Draw the UML class diagram relationships for the program.