Builder Design Pattern

README.md

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-# 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
+![Diagram](https://github.com/premaseem/DesignPatternsJava9/blob/builder/diagrams/3.3%20Builder%20Design%20pattern.png "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
+
+### ![ http://in.linkedin.com/in/premaseem](https://github.com/premaseem/DesignPatternsJava9/blob/master/linkedin.png "http://in.linkedin.com/in/premaseem") 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.

pattern/src/com/premaseem/Client.java

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 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);
+
     }
 }

pattern/src/com/premaseem/builder/House.java

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+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 "";
+    }
+}

pattern/src/com/premaseem/builder/HouseBuilder.java

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+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);
+    }
+
+}

pattern/src/com/premaseem/builder/OneBedroomHouseBuilder.java

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+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());
+    }
+}

pattern/src/com/premaseem/builder/TwoBedroomHouseBuilder.java

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+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());
+    }
+}

pattern/src/com/premaseem/director/Architect.java

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+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();
+    }
+}

pattern/src/com/premaseem/room/BathRoom.java

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+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);
+}
+}

pattern/src/com/premaseem/room/BedRoom.java

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+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);
+}
+}

pattern/src/com/premaseem/room/LivingRoom.java

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+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);
+}
+}

pattern/src/com/premaseem/room/Room.java

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+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;
+    }
+}
+

patternBonus/src/com/premaseem/McDonaldsMealBuilder/ClientFile.java

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+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 ");
+
+	}
+}