import java.util.*;

public class BuilderPattern {

public static void main(String args[])

{

// Create director and builders

Director tDirector = new Director();

Builder tBuilder1 = new ConcreteBuilder1();

Builder tBuilder2 = new ConcreteBuilder2();

// Construct two products

tDirector.Construct(tBuilder1);

Product tProduct1 = tBuilder1.GetResult();

tProduct1.Show();

tDirector.Construct(tBuilder2);

Product tProduct2 = tBuilder2.GetResult();

tProduct2.Show();

}

}

class Director

{

public void Construct(Builder builder)

{

builder.BuildPartA();

builder.BuildPartB();

}

}

abstract class Builder

{

public abstract void BuildPartA();

public abstract void BuildPartB();

public abstract Product GetResult();

}

class ConcreteBuilder1 extends Builder

{

private Product mProduct = new Product();

public void BuildPartA()

{

mProduct.Add("Part A");

}

public void BuildPartB()

{

mProduct.Add("Part B");

}

public Product GetResult()

{

return mProduct;

}

}

class ConcreteBuilder2 extends Builder

{

private Product mProduct = new Product();

public void BuildPartA()

{

mProduct.Add("Part X");

}

public void BuildPartB()

{

mProduct.Add("Part Y");

}

public Product GetResult()

{

return mProduct;

}

}

class Product

{

private ArrayList<String> szParts = new ArrayList<String>();

public void Add(String pPart)

{

szParts.add(pPart);

}

public void Show()

{

System.out.println("\nParts on product:");

for(int i = 0; i < szParts.size(); ++i)

System.out.println(szParts.get(i));

}

}