import java.util.ArrayList;
import java.util.List;

public class Test {
public static void main(String[] args) {

Order order = new Order();

Product product = new Product();
product.setName(”BMAW”);
product.setPrice(9786);

order.addOrderLine(product);

order = null; // OrderLines are destroyed along with order
//Because orderLine and Order have strong relationships i.e. composition.
//But Product will exist, even orderLine is deleted because it have weaker relationship
//i.e. Composition.
}
}

class OrderLine {
Product product;
int quantity;

// Add many attribute per you order line.

public Product getProduct() {
return this.product;
}

public void setProduct(Product product) {
this.product = product;
}

}

class Product {
private String name;
private int price;
// Add many attributes as you need.
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public int getPrice() {
return price;
}
public void setPrice(int price) {
this.price = price;
}
}

class Order {
private List lines = new ArrayList();
String customerName;

// Add many order attributes as you need.
public boolean addOrderLine(Product product) {
OrderLine line = new OrderLine();
line.setProduct(product);
lines.add(line);
return true;
}
}

public class Composition {
public static void main(String[] args) {
// Frame objects life-cycle is totally under container class controll
Car car = new Car();
}
}

class Car {
private ArrayList frames;

public Car() {
frames = new ArrayList();
frames.add(new CarFrame());
}
}

class CarFrame {}

import java.util.ArrayList;

public class Aggregation {
public static void main(String[] args)
{
MusicPlayer player = new MusicPlayer();
Car car = new Car();
car.addPlayer(player);
}
}

/**
* Client, Aggregate, Whole
*/
class Car {
private ArrayList players;

public Car() {
// players list is empty, we can attach players via addPlayer(), so
// that car CONTAINS players, however our car object is not dependant
// on player for initialization – we can initialize car objects even
// if we have no intention to put player into them
players = new ArrayList();
}

public void addPlayer(MusicPlayer p)
{
players.add(p);
}
}

/**
* Dump MusicPlayer class
*/
class MusicPlayer {}