diff --git a/README.md b/README.md
index 9e0034c..0e45575 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,29 @@
-# DesignPatternsJava9
-This repo consists Gang of Four Design patterns code on Java 9. Each branch in the repository has code of 1 design pattern. Switch repository to try out different design patterns.
+# What is Builder Design Pattern
+* The Builder pattern is a GOF Creational design pattern. Builder pattern hide the complexity of object creation.It Encapsulates creating and assembling the parts of a complex object in a separate Builder object.
+* A class delegates object creation to a Builder object instead of creating the objects directly.
+
+## Diagram
+
+
+### When to use Builder Design Pattern
+When application needs to create complex objects with mutliple steps involved in creation and expect final object as outcome.
+
+### Learn Design Patterns with Java by Aseem Jain
+This repository contains working project code used in video Course by Packt Publication with title "Learn Design Patterns with Java " authored by "Aseem Jain".
+
+### Course link:
+https://www.packtpub.com/application-development/learn-design-patterns-java-9-video
+
+###  Profile: http://in.linkedin.com/in/premaseem
+
+### Authors blog on design patterns:
+https://premaseem.wordpress.com/category/computers/design-patterns/
+
+### Software Design pattern community face book page:
+https://www.facebook.com/DesignPatternGuru/
+
+### Note:
+* This code base will work on Java 9 and above versions.
+* `diagrams` folders carry UML diagrams.
+* `pattern` folder has code of primary example.
+* `patternBonus` folder has code of secondary or bonus example.
diff --git a/diagrams/3.3 Builder Design pattern.png b/diagrams/3.3 Builder Design pattern.png
new file mode 100644
index 0000000..a831d23
Binary files /dev/null and b/diagrams/3.3 Builder Design pattern.png differ
diff --git a/pattern/src/com/premaseem/Client.java b/pattern/src/com/premaseem/Client.java
index 15f05df..17f964e 100644
--- a/pattern/src/com/premaseem/Client.java
+++ b/pattern/src/com/premaseem/Client.java
@@ -1,13 +1,25 @@
package com.premaseem;
+import com.premaseem.builder.House;
+import com.premaseem.builder.OneBedroomHouseBuilder;
+import com.premaseem.builder.TwoBedroomHouseBuilder;
+import com.premaseem.director.Architect;
+
/*
@author: Aseem Jain
@title: Design Patterns with Java 9
@link: https://premaseem.wordpress.com/category/computers/design-patterns/
-@copyright: 2018 Packt Publication
*/
public class Client {
public static void main (String[] args) {
- System.out.println("Singleton cook example ");
+ System.out.println("Builder Design pattern example ");
+ Architect architect = new Architect();
+
+ // Hiding complexity and building one bed room house
+ architect.setHouseBuilder(new OneBedroomHouseBuilder());
+ architect.buildHouse();
+ House house = architect.getFinishedHouse();
+ System.out.println(house);
+
}
}
diff --git a/pattern/src/com/premaseem/builder/House.java b/pattern/src/com/premaseem/builder/House.java
new file mode 100644
index 0000000..799981a
--- /dev/null
+++ b/pattern/src/com/premaseem/builder/House.java
@@ -0,0 +1,32 @@
+package com.premaseem.builder;
+
+import com.premaseem.room.Room;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/*
+@author: Aseem Jain
+@title: Design Patterns with Java 9
+@link: https://premaseem.wordpress.com/category/computers/design-patterns/
+*/
+/* "Product" */
+public class House {
+ List<Room> rooms = new ArrayList<>();
+ private String exteriorColor = "while";
+
+ public String getExteriorColor () {
+ return exteriorColor;
+ }
+
+ public void setExteriorColor (String exteriorColor) {
+ this.exteriorColor = exteriorColor;
+ }
+
+ @Override
+ public String toString () {
+ System.out.println("house has total rooms " + rooms.size());
+ System.out.println("house has color " + getExteriorColor());
+ return "";
+ }
+}
diff --git a/pattern/src/com/premaseem/builder/HouseBuilder.java b/pattern/src/com/premaseem/builder/HouseBuilder.java
new file mode 100644
index 0000000..1243c45
--- /dev/null
+++ b/pattern/src/com/premaseem/builder/HouseBuilder.java
@@ -0,0 +1,39 @@
+package com.premaseem.builder;
+
+/*
+@author: Aseem Jain
+@title: Design Patterns with Java 9
+@link: https://premaseem.wordpress.com/category/computers/design-patterns/
+*/
+/* "Abstract Builder" */
+public abstract class HouseBuilder {
+ public House getHouse () {
+ return house;
+ }
+
+ private House house =null;
+
+ public HouseBuilder(){
+ house = new House();
+ }
+
+ public abstract void addRooms();
+
+ public void addSecuritySystem(){
+ System.out.println("adding security system");
+ }
+
+ public void addPlumbingSystem(){
+ System.out.println("adding plumbing system");
+ }
+
+ public void addAirConditionerSystem(){
+ System.out.println("adding air conditioning system");
+ }
+
+ public void paintHouse(String color){
+ System.out.println("paiting house with color " + color);
+ house.setExteriorColor(color);
+ }
+
+}
diff --git a/pattern/src/com/premaseem/builder/OneBedroomHouseBuilder.java b/pattern/src/com/premaseem/builder/OneBedroomHouseBuilder.java
new file mode 100644
index 0000000..2fb4fdf
--- /dev/null
+++ b/pattern/src/com/premaseem/builder/OneBedroomHouseBuilder.java
@@ -0,0 +1,22 @@
+package com.premaseem.builder;
+
+import com.premaseem.room.BathRoom;
+import com.premaseem.room.BedRoom;
+import com.premaseem.room.LivingRoom;
+
+/*
+@author: Aseem Jain
+@title: Design Patterns with Java 9
+@link: https://premaseem.wordpress.com/category/computers/design-patterns/
+*/
+
+/* "ConcreteBuilder" */
+public class OneBedroomHouseBuilder extends HouseBuilder{
+
+ @Override
+ public void addRooms () {
+ getHouse().rooms.add(new BathRoom());
+ getHouse().rooms.add(new BedRoom());
+ getHouse().rooms.add(new LivingRoom());
+ }
+}
diff --git a/pattern/src/com/premaseem/builder/TwoBedroomHouseBuilder.java b/pattern/src/com/premaseem/builder/TwoBedroomHouseBuilder.java
new file mode 100644
index 0000000..8a671b1
--- /dev/null
+++ b/pattern/src/com/premaseem/builder/TwoBedroomHouseBuilder.java
@@ -0,0 +1,22 @@
+package com.premaseem.builder;
+
+import com.premaseem.room.BathRoom;
+import com.premaseem.room.BedRoom;
+import com.premaseem.room.LivingRoom;
+
+/*
+@author: Aseem Jain
+@title: Design Patterns with Java 9
+@link: https://premaseem.wordpress.com/category/computers/design-patterns/
+*/
+
+/* "ConcreteBuilder" */
+public class TwoBedroomHouseBuilder extends HouseBuilder{
+
+ @Override
+ public void addRooms () {
+ getHouse().rooms.add(new BathRoom());
+ getHouse().rooms.add(new BedRoom());
+ getHouse().rooms.add(new LivingRoom());
+ }
+}
diff --git a/pattern/src/com/premaseem/director/Architect.java b/pattern/src/com/premaseem/director/Architect.java
new file mode 100644
index 0000000..1d6263a
--- /dev/null
+++ b/pattern/src/com/premaseem/director/Architect.java
@@ -0,0 +1,32 @@
+package com.premaseem.director;
+
+import com.premaseem.builder.House;
+import com.premaseem.builder.HouseBuilder;
+
+/*
+@author: Aseem Jain
+@title: Design Patterns with Java 9
+@link: https://premaseem.wordpress.com/category/computers/design-patterns/
+*/
+
+/* "Director" */
+public class Architect {
+
+ private HouseBuilder houseBuilder;
+
+ public void setHouseBuilder (HouseBuilder houseBuilder) {
+ this.houseBuilder = houseBuilder;
+ }
+
+ public void buildHouse() {
+ houseBuilder.addRooms();
+ houseBuilder.addPlumbingSystem();
+ houseBuilder.addAirConditionerSystem();
+ houseBuilder.addSecuritySystem();
+ houseBuilder.paintHouse("white");
+ }
+
+ public House getFinishedHouse(){
+ return houseBuilder.getHouse();
+ }
+}
diff --git a/pattern/src/com/premaseem/room/BathRoom.java b/pattern/src/com/premaseem/room/BathRoom.java
new file mode 100644
index 0000000..0e31541
--- /dev/null
+++ b/pattern/src/com/premaseem/room/BathRoom.java
@@ -0,0 +1,14 @@
+package com.premaseem.room;
+
+/*
+@author: Aseem Jain
+@title: Design Patterns with Java 9
+@link: https://premaseem.wordpress.com/category/computers/design-patterns/
+*/
+public class BathRoom extends Room {
+
+public BathRoom (){
+ setNumberOfWindows(0);
+ setNumberOfWalls(3);
+}
+}
diff --git a/pattern/src/com/premaseem/room/BedRoom.java b/pattern/src/com/premaseem/room/BedRoom.java
new file mode 100644
index 0000000..cc75783
--- /dev/null
+++ b/pattern/src/com/premaseem/room/BedRoom.java
@@ -0,0 +1,14 @@
+package com.premaseem.room;
+
+/*
+@author: Aseem Jain
+@title: Design Patterns with Java 9
+@link: https://premaseem.wordpress.com/category/computers/design-patterns/
+*/
+public class BedRoom extends Room {
+
+public BedRoom(){
+ setNumberOfWindows(2);
+ setNumberOfWalls(4);
+}
+}
diff --git a/pattern/src/com/premaseem/room/LivingRoom.java b/pattern/src/com/premaseem/room/LivingRoom.java
new file mode 100644
index 0000000..e401f64
--- /dev/null
+++ b/pattern/src/com/premaseem/room/LivingRoom.java
@@ -0,0 +1,14 @@
+package com.premaseem.room;
+
+/*
+@author: Aseem Jain
+@title: Design Patterns with Java 9
+@link: https://premaseem.wordpress.com/category/computers/design-patterns/
+*/
+public class LivingRoom extends Room {
+
+public LivingRoom (){
+ setNumberOfWindows(2);
+ setNumberOfWalls(3);
+}
+}
diff --git a/pattern/src/com/premaseem/room/Room.java b/pattern/src/com/premaseem/room/Room.java
new file mode 100644
index 0000000..0de4757
--- /dev/null
+++ b/pattern/src/com/premaseem/room/Room.java
@@ -0,0 +1,30 @@
+package com.premaseem.room;
+
+/*
+@author: Aseem Jain
+@title: Design Patterns with Java 9
+@link: https://premaseem.wordpress.com/category/computers/design-patterns/
+*/
+public class Room {
+
+ private Integer numberOfWindows = 1;
+ private Integer numberOfWalls = 4;
+
+
+ public Integer getNumberOfWindows () {
+ return numberOfWindows;
+ }
+
+ public void setNumberOfWindows (Integer numberOfWindows) {
+ this.numberOfWindows = numberOfWindows;
+ }
+
+ public Integer getNumberOfWalls () {
+ return numberOfWalls;
+ }
+
+ public void setNumberOfWalls (Integer numberOfWalls) {
+ this.numberOfWalls = numberOfWalls;
+ }
+}
+
diff --git a/patternBonus/src/com/premaseem/Client.java b/patternBonus/src/com/premaseem/Client.java
deleted file mode 100644
index 15f05df..0000000
--- a/patternBonus/src/com/premaseem/Client.java
+++ /dev/null
@@ -1,13 +0,0 @@
-package com.premaseem;
-
-/*
-@author: Aseem Jain
-@title: Design Patterns with Java 9
-@link: https://premaseem.wordpress.com/category/computers/design-patterns/
-@copyright: 2018 Packt Publication
-*/
-public class Client {
- public static void main (String[] args) {
- System.out.println("Singleton cook example ");
- }
-}
diff --git a/patternBonus/src/com/premaseem/McDonaldsMealBuilder/ClientFile.java b/patternBonus/src/com/premaseem/McDonaldsMealBuilder/ClientFile.java
new file mode 100644
index 0000000..66585ed
--- /dev/null
+++ b/patternBonus/src/com/premaseem/McDonaldsMealBuilder/ClientFile.java
@@ -0,0 +1,44 @@
+package com.premaseem.McDonaldsMealBuilder;
+
+import java.util.Scanner;
+
+public class ClientFile {
+
+ public static void main(String[] args) {
+
+ System.out.println("Welcome to the Mc Donal which uses Builder Design pattern to build their Meals ");
+ Scanner scan = new Scanner(System.in);
+
+ int repeatRunFlag = 1;
+ MealBuilder mealBuilder = new MealBuilder();
+ Meal meal = null;
+ while (repeatRunFlag == 1) {
+ System.out.println("Which Meal would you like to order ? ");
+ System.out.println("press 1 for Veg Meal");
+ System.out.println("press 2 for Non Veg Meal ");
+
+ int type = scan.nextInt();
+ if (type == 1) {
+ meal = mealBuilder.buildVegMeal();
+ } else {
+ meal = mealBuilder.buildNonVegMeal();
+ }
+
+
+ System.out.println(meal);
+ System.out.println("=============================");
+
+ System.out.println("Press 1 to Repeat .... ");
+ try {
+ repeatRunFlag = scan.nextInt();
+ } catch (Exception e) {
+ repeatRunFlag = 0;
+ }
+
+ }
+
+ System.out.println("\n $$$$$$$$$$$$$$$$$$$$ Thanks by Prem Aseem $$$$$$$$$$$$$$$$$$$$$$ \n ");
+ System.out.println("\n $$$$$$$$$$$$$$$$$$$$$ www.premaseem.me $$$$$$$$$$$$$$$$$$$$$$ \n ");
+
+ }
+}
diff --git a/patternBonus/src/com/premaseem/McDonaldsMealBuilder/Meal.java b/patternBonus/src/com/premaseem/McDonaldsMealBuilder/Meal.java
new file mode 100644
index 0000000..aa98337
--- /dev/null
+++ b/patternBonus/src/com/premaseem/McDonaldsMealBuilder/Meal.java
@@ -0,0 +1,77 @@
+package com.premaseem.McDonaldsMealBuilder;
+
+import java.util.ArrayList;
+import java.util.List;
+
+
+public class Meal{
+ int cost;
+ List<Item> meal = new ArrayList<Item>();
+ void addItem(Item item){
+ cost += item.cost;
+ meal.add(item);
+ }
+ @Override
+ public String toString() {
+ System.out.println("You meal is ");
+ for(Item itm: meal){
+ System.out.print (itm.name + " ");
+ }
+ System.out.println();
+ System.out.println("Toal cost - " + cost);
+ return " ";
+ }
+}
+
+abstract class Item{
+ Wrap warp;
+ int cost =2;
+ String name;
+}
+
+class Burger extends Item{
+}
+
+class VegBurger extends Burger {
+ public VegBurger() {
+ this.name = "VegBurger";
+ }
+}
+
+class ChikenBurger extends Burger {
+ public ChikenBurger() {
+ this.name = "ChikenBurger";
+ }
+}
+
+class Wrap {
+ public String name;
+}
+
+class Bottle extends Wrap {
+ public Bottle() {
+ this.name = "Bottle";
+ }
+}
+
+class Box extends Wrap {
+ public Box() {
+ this.name = "Box";
+ }
+}
+
+class Drink extends Item {
+}
+
+class Milk extends Drink {
+ public Milk() {
+ this.name = "Milk";
+ cost = 10;
+ }
+}
+
+class Blood extends Drink {
+ public Blood() {
+ this.name = "Blood";
+ }
+}
diff --git a/patternBonus/src/com/premaseem/McDonaldsMealBuilder/MealBuilder.java b/patternBonus/src/com/premaseem/McDonaldsMealBuilder/MealBuilder.java
new file mode 100644
index 0000000..67c2792
--- /dev/null
+++ b/patternBonus/src/com/premaseem/McDonaldsMealBuilder/MealBuilder.java
@@ -0,0 +1,36 @@
+package com.premaseem.McDonaldsMealBuilder;
+
+
+public class MealBuilder {
+
+ public Meal buildVegMeal() {
+ Meal meal = new Meal();
+ Wrap bottle = new Bottle();
+ Wrap box = new Box();
+ VegBurger veg = new VegBurger();
+ veg.warp = box;
+ Drink milk = new Milk();
+ milk.warp=bottle;
+
+ meal.addItem(veg);
+ meal.addItem(milk);
+ return meal;
+ }
+
+ public Meal buildNonVegMeal() {
+ Meal meal = new Meal();
+ Wrap bottle = new Bottle();
+ Wrap box = new Box();
+ Burger veg = new ChikenBurger();
+ veg.warp = box;
+ Drink milk = new Blood();
+ milk.warp=bottle;
+
+ meal.addItem(veg);
+ meal.addItem(milk);
+ return meal;
+
+ }
+}
+
+
diff --git a/patternBonus/src/com/premaseem/ambulanceBuilder/AmbulanceBuilder.java b/patternBonus/src/com/premaseem/ambulanceBuilder/AmbulanceBuilder.java
new file mode 100644
index 0000000..8e82f40
--- /dev/null
+++ b/patternBonus/src/com/premaseem/ambulanceBuilder/AmbulanceBuilder.java
@@ -0,0 +1,38 @@
+package com.premaseem.ambulanceBuilder;
+
+public class AmbulanceBuilder {
+
+ Ambulance buildAmbulance(int numberOfWheel, String label){
+ Ambulance ambulance=new Ambulance();
+ VanFactory vanFactory = new VanFactory();
+ ambulance.setVan(vanFactory.getVan(numberOfWheel));
+ ambulance.setLabel(label);
+ return ambulance;
+ }
+}
+
+class Ambulance{
+ Van van;
+ String label;
+
+ Van getVan() {
+ return van;
+ }
+ void setVan(Van van) {
+ this.van = van;
+ }
+ String getLabel() {
+ return label;
+ }
+ void setLabel(String label) {
+ this.label = label;
+ }
+
+
+ @Override
+ public String toString() {
+ return "Ambulance for " + label + " with number of wheels " + van.noOfWheels;
+ }
+
+
+}
\ No newline at end of file
diff --git a/patternBonus/src/com/premaseem/ambulanceBuilder/ClientForAmbulanceBuilder.java b/patternBonus/src/com/premaseem/ambulanceBuilder/ClientForAmbulanceBuilder.java
new file mode 100644
index 0000000..851fd02
--- /dev/null
+++ b/patternBonus/src/com/premaseem/ambulanceBuilder/ClientForAmbulanceBuilder.java
@@ -0,0 +1,49 @@
+package com.premaseem.ambulanceBuilder;
+
+import java.util.Scanner;
+
+
+public class ClientForAmbulanceBuilder {
+
+ public static void main(String[] args) {
+
+ System.out.println("Welcome to Abmulance Builder project ");
+ Scanner scan = new Scanner(System.in);
+
+ int repeatRunFlag = 1;
+ AmbulanceBuilder ambulanceBuilder = new AmbulanceBuilder();
+ Ambulance ambulance = null;
+ while (repeatRunFlag == 1) {
+ System.out.println("What kind of Ambulance you want ? ");
+ System.out.println("press 1 for 4 Wheeler");
+ System.out.println("press 2 for 6 Wheeler ");
+ System.out.println("press 3 for 8 Wheeler ");
+
+ int numberOfWheel = scan.nextInt();
+
+ System.out.println("What kind lable you want for Ambulance ? ");
+ String label = scan.next();
+
+ ambulance = ambulanceBuilder.buildAmbulance(numberOfWheel, label);
+
+
+ System.out.println("Ambulanc is build " + ambulance);
+ System.out.println("=============================");
+
+ System.out.println("Press 1 to Repeat .... ");
+ try {
+ repeatRunFlag = scan.nextInt();
+ } catch (Exception e) {
+ repeatRunFlag = 0;
+ }
+
+ }
+
+ System.out.println("\n $$$$$$$$$$$$$$$$$$$$ Thanks by Prem Aseem $$$$$$$$$$$$$$$$$$$$$$ \n ");
+ System.out.println("\n $$$$$$$$$$$$$$$$$$$$$ www.premaseem.com $$$$$$$$$$$$$$$$$$$$$$ \n ");
+
+ }
+
+
+
+}
diff --git a/patternBonus/src/com/premaseem/ambulanceBuilder/VanFactory.java b/patternBonus/src/com/premaseem/ambulanceBuilder/VanFactory.java
new file mode 100644
index 0000000..213472d
--- /dev/null
+++ b/patternBonus/src/com/premaseem/ambulanceBuilder/VanFactory.java
@@ -0,0 +1,52 @@
+package com.premaseem.ambulanceBuilder;
+
+public class VanFactory {
+
+ // factory method
+ Van createVan(int noOfWheel) {
+ Van van = new Van();
+ van.noOfWheels = noOfWheel;
+ return van;
+ }
+
+ // simple factory
+ Van getVan(int noOfWheel) {
+
+ switch (noOfWheel) {
+ case 1:
+ return new FourWheelerVan();
+ case 2:
+ return new FourWheelerVan();
+ default:
+ return new EightWheelerVan();
+ }
+
+ }
+
+}
+
+
+
+
+
+class Van {
+ int noOfWheels;
+}
+
+class SixWheelerVan extends Van {
+ public SixWheelerVan() {
+ noOfWheels = 6;
+ }
+}
+
+class FourWheelerVan extends Van {
+ public FourWheelerVan() {
+ noOfWheels = 4;
+ }
+}
+
+class EightWheelerVan extends Van {
+ public EightWheelerVan() {
+ noOfWheels = 8;
+ }
+}