Beverage class which holds the abstract information of a beverage.

01.Beverage.java

package com.v1;

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

public abstract class Beverage {
  String description ;
	List<ICondiment> condiments = new ArrayList<ICondiment>();
	
	public void addCondiment(ICondiment condiment){
		condiments.add(condiment);
	}
	
	public int getCondimentCost(){
		int cost = 0;
		for (ICondiment condCB : condiments) {
			cost += condCB.cost();
		}
		return cost;
	}
	
	public String getDescription() {
		return description;
	}
	
	public abstract int cost();
}

02.HouseBlend.java

package com.v1;

public class HouseBlend extends Beverage {

  public HouseBlend() {
		super();
		this.description = "This is house blend...";
	}

	@Override
	public int cost() {
		return 6 + getCondimentCost();
	}
}

03.DarkRoast.java

package com.v1;

public class DarkRoast extends Beverage {

  public DarkRoast() {
		super();
		this.description = "This is dark roast...";
	}

	@Override
	public int cost() {
		return 7 + getCondimentCost();
	}
}

04.Decaf.java

package com.v1;

public class Decaf extends Beverage {

  public Decaf() {
		super();
		this.description = "This is decaf. It is decafed...";
	}

	@Override
	public int cost() {
		return 8 + getCondimentCost();
	}

}

05.Espresso.java

package com.v1;

public class Espresso extends Beverage {

  public Espresso() {
		super();
		this.description = "This is espresso. It is the most expensive...";
	}

	@Override
	public int cost() {
		return 10 + getCondimentCost();
	}

}

06.ICondiment.java

package com.v1;

public interface ICondiment {
  int cost();
}

07.Milk.java

package com.v1.condiments;

import com.v1.ICondiment;

public class Milk implements ICondiment {

  @Override
	public int cost() {
		return 1;
	}

}

08.Mocha.java

package com.v1.condiments;

import com.v1.ICondiment;

public class Mocha implements ICondiment{

  @Override
	public int cost() {
		return 3;
	}

}

09.Soy.java

package com.v1.condiments;

import com.v1.ICondiment;

public class Soy implements ICondiment {

  @Override
	public int cost() {
		return 2;
	}

}

10.Impl.java

package com.v1;

import com.v1.condiments.Milk;
import com.v1.condiments.Mocha;
public class Impl {

  public static void main(String[] args) {
		HouseBlend hb = new HouseBlend();
		System.out.println("Add three unit of milk and mocha.");
		hb.addCondiment(new Milk());
		hb.addCondiment(new Milk());
		hb.addCondiment(new Milk());
		hb.addCondiment(new Mocha());
		System.out.println("House Blend : " + hb.getDescription() + " Cost : " + hb.cost() );
	}

}