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| Builder Design pattern - Implementation [Beverage] |
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| Builder Design pattern - Implementation [Beverage] - Class Diagram |
Beverage.java
public class Beverage
{
private int water;
private int milk;
private int sugar;
private int powderQuantity;
private String beverageName;
public int getWater()
{
return water;
}
public void setWater( int water )
{
this.water = water;
}
public int getMilk()
{
return milk;
}
public void setMilk( int milk )
{
this.milk = milk;
}
public int getSugar()
{
return sugar;
}
public void setSugar( int sugar )
{
this.sugar = sugar;
}
public int getPowderQuantity()
{
return powderQuantity;
}
public void setPowderQuantity( int powderQuantity )
{
this.powderQuantity = powderQuantity;
}
public String getBeverageName()
{
return beverageName;
}
public void setBeverageName( String beverageName )
{
this.beverageName = beverageName;
}
public String toString()
{
return "Hot " + beverageName + "!!!! [" + water + " ml of water, " + milk + "ml of milk, " + sugar
+ " gm of sugar, " + powderQuantity + " gm of " + beverageName + "]\n";
}
}
BeverageBuilder.java
/**
*
* BeverageBuilder is a blue print for any Class that wants to create
* Beverage. It will have different subClass implementations of BeverageBuilder
* for different beverages[e.g. coffee,tea,Horlicks etc].
*/
public abstract class BeverageBuilder
{
private Beverage beverage;
public Beverage getBeverage()
{
return beverage;
}
public void setBeverage( Beverage beverage )
{
this.beverage = beverage;
}
/*
* Template method that creates Beverage Object and returns Beverage
* Object after adding components in required proportion.
*/
public final Beverage buildBeverage()
{
Beverage beverage = createBeverage();
setBeverage(beverage);
setBeverageType();
setWater();
setMilk();
setSugar();
setPowderQuantity();
return beverage;
}
abstract void setBeverageType();
abstract void setWater();
abstract void setMilk();
abstract void setSugar();
abstract void setPowderQuantity();
abstract Beverage createBeverage();
}
CoffeeBuilder.java
/*
* CoffeeBuilder creates coffee by mixing the components[water,milk,sugar,coffee powder].
* CoffeeBuilder implements BeverageBuilder which is bluePrint for creating beverage objects.
* */
public class CoffeeBuilder extends BeverageBuilder
{
Beverage createBeverage()
{
return new Beverage();
}
public void setWater()
{
System.out.println("Step 1 : Boiling water");
getBeverage().setWater(40);
}
public void setMilk()
{
System.out.println("Step 2 : Adding milk");
getBeverage().setMilk(50);
}
void setSugar()
{
System.out.println("Step 3 : Adding sugar");
getBeverage().setSugar(10);
}
void setPowderQuantity()
{
System.out.println("Step 4 : Adding 9 Grams of coffee powder");
getBeverage().setPowderQuantity(9);
}
void setBeverageType()
{
System.out.println("Coffee");
getBeverage().setBeverageName("Coffee");
}
}
TeaBuider.java
/*
* TeaBuilder creates Tea by mixing the components[water,milk,sugar,tea powder].
* It implements BeverageBuilder which is bluePrint for creating beverage objects.
* */
public class TeaBuider extends BeverageBuilder
{
Beverage createBeverage()
{
return new Beverage();
}
public void setWater()
{
System.out.println("Step 1 : Boiling water");
getBeverage().setWater(40);
}
public void setMilk()
{
System.out.println("Step 2 : Adding milk");
getBeverage().setMilk(50);
}
void setSugar()
{
System.out.println("Step 3 : Adding sugar");
getBeverage().setSugar(10);
}
void setPowderQuantity()
{
System.out.println("Step 4 : Adding 9 Grams of tea powder");
getBeverage().setPowderQuantity(9);
}
void setBeverageType()
{
System.out.println("Tea");
getBeverage().setBeverageName("Tea");
}
}
HotelWaiter.java
public class HotelWaiter
{
public static Beverage takeOrder( String beverageType )
{
BeverageBuilder beverageBuilder = null;
if( beverageType.equalsIgnoreCase("tea") )
{
beverageBuilder = new TeaBuider();
}
else if( beverageType.equalsIgnoreCase("coffee") )
{
beverageBuilder = new CoffeeBuilder();
}
else
{
System.out.println("Sorry we don't take order for " + beverageType);
}
return beverageBuilder.buildBeverage();
}
}
BuilderClient.java
/*
* Customer who is in hotel and customer can place order to
* HotelWaiter or Servant.
*/
public class BuilderClient
{
public static void main( String[] args )
{
Beverage tea = HotelWaiter.takeOrder("tea");
System.out.println(tea);
Beverage coffee = HotelWaiter.takeOrder("coffee");
System.out.println(coffee);
}
}
Output
Tea
Step 1 : Boiling water
Step 2 : Adding milk
Step 3 : Adding sugar
Step 4 : Adding 9 Grams of tea powder
Hot Tea!!!! [40 ml of water, 50ml of milk, 10 gm of sugar, 9 gm of Tea]
Coffee
Step 1 : Boiling water
Step 2 : Adding milk
Step 3 : Adding sugar
Step 4 : Adding 9 Grams of coffee powder
Hot Coffee!!!! [40 ml of water, 50ml of milk, 10 gm of sugar, 9 gm of Coffee]
See also:
