Formatted all files to the same standard

abstract-factory/src/main/java/com/iluwatar/App.java

@@ -1,29 +1,29 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * The essence of the Abstract Factory pattern is a factory interface
  * (KingdomFactory) and its implementations (ElfKingdomFactory,
  * OrcKingdomFactory).
- *
+ * 
  * The example uses both concrete implementations to create a king, a castle and
  * an army.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        createKingdom(new ElfKingdomFactory());
+		createKingdom(new ElfKingdomFactory());
-        createKingdom(new OrcKingdomFactory());
+		createKingdom(new OrcKingdomFactory());
-    }
+	}
 
-    public static void createKingdom(KingdomFactory factory) {
+	public static void createKingdom(KingdomFactory factory) {
-        King king = factory.createKing();
+		King king = factory.createKing();
-        Castle castle = factory.createCastle();
+		Castle castle = factory.createCastle();
-        Army army = factory.createArmy();
+		Army army = factory.createArmy();
-        System.out.println("The kingdom was created.");
+		System.out.println("The kingdom was created.");
-        System.out.println(king);
+		System.out.println(king);
-        System.out.println(castle);
+		System.out.println(castle);
-        System.out.println(army);
+		System.out.println(army);
-    }
+	}
 }

abstract-factory/src/main/java/com/iluwatar/ElfArmy.java

@@ -6,5 +6,5 @@ public class ElfArmy implements Army {
 	public String toString() {
 		return "This is the Elven Army!";
 	}
-	
+
 }

abstract-factory/src/main/java/com/iluwatar/ElfCastle.java

@@ -6,5 +6,5 @@ public class ElfCastle implements Castle {
 	public String toString() {
 		return "This is the Elven castle!";
 	}
-	
+
 }

abstract-factory/src/main/java/com/iluwatar/ElfKing.java

@@ -6,5 +6,5 @@ public class ElfKing implements King {
 	public String toString() {
 		return "This is the Elven king!";
 	}
-	
+
 }

abstract-factory/src/main/java/com/iluwatar/ElfKingdomFactory.java

@@ -3,7 +3,7 @@ package com.iluwatar;
 /**
  * 
  * Concrete factory.
- *
+ * 
  */
 public class ElfKingdomFactory implements KingdomFactory {
 

abstract-factory/src/main/java/com/iluwatar/KingdomFactory.java

@@ -3,12 +3,14 @@ package com.iluwatar;
 /**
  * 
  * The factory interface.
- *
+ * 
  */
 public interface KingdomFactory {
 
 	Castle createCastle();
+
 	King createKing();
+
 	Army createArmy();
-	
+
 }

abstract-factory/src/main/java/com/iluwatar/OrcArmy.java

@@ -6,5 +6,5 @@ public class OrcArmy implements Army {
 	public String toString() {
 		return "This is the Orcish Army!";
 	}
-	
+
 }

abstract-factory/src/main/java/com/iluwatar/OrcCastle.java

@@ -6,5 +6,5 @@ public class OrcCastle implements Castle {
 	public String toString() {
 		return "This is the Orcish castle!";
 	}
-	
+
 }

abstract-factory/src/main/java/com/iluwatar/OrcKing.java

@@ -6,5 +6,5 @@ public class OrcKing implements King {
 	public String toString() {
 		return "This is the Orc king!";
 	}
-	
+
 }

abstract-factory/src/main/java/com/iluwatar/OrcKingdomFactory.java

@@ -3,7 +3,7 @@ package com.iluwatar;
 /**
  * 
  * Concrete factory.
- *
+ * 
  */
 public class OrcKingdomFactory implements KingdomFactory {
 

adapter/src/main/java/com/iluwatar/App.java

@@ -1,21 +1,21 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * There are two variations of the Adapter pattern: The class adapter implements
  * the adaptee's interface whereas the object adapter uses composition to
  * contain the adaptee in the adapter object. This example uses the object
  * adapter approach.
- *
+ * 
  * The Adapter (GnomeEngineer) converts the interface of the target class
  * (GoblinGlider) into a suitable one expected by the client
  * (GnomeEngineeringManager).
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        GnomeEngineeringManager manager = new GnomeEngineeringManager();
+		GnomeEngineeringManager manager = new GnomeEngineeringManager();
-        manager.operateDevice();
+		manager.operateDevice();
-    }
+	}
 }

adapter/src/main/java/com/iluwatar/Engineer.java

@@ -3,10 +3,10 @@ package com.iluwatar;
 /**
  * 
  * Engineers can operate devices.
- *
+ * 
  */
 public interface Engineer {
 
 	void operateDevice();
-	
+
 }

adapter/src/main/java/com/iluwatar/GnomeEngineer.java

@@ -2,15 +2,14 @@ package com.iluwatar;
 
 /**
  * 
- * Adapter class. Adapts the interface of the device
+ * Adapter class. Adapts the interface of the device (GoblinGlider) into
- * (GoblinGlider) into Engineer interface expected 
+ * Engineer interface expected by the client (GnomeEngineeringManager).
- * by the client (GnomeEngineeringManager).
+ * 
- *
  */
 public class GnomeEngineer implements Engineer {
 
 	private GoblinGlider glider;
-	
+
 	public GnomeEngineer() {
 		glider = new GoblinGlider();
 	}
@@ -21,5 +20,5 @@ public class GnomeEngineer implements Engineer {
 		glider.gainSpeed();
 		glider.takeOff();
 	}
-	
+
 }

adapter/src/main/java/com/iluwatar/GnomeEngineeringManager.java

@@ -2,18 +2,17 @@ package com.iluwatar;
 
 /**
  * 
- * GnomeEngineering manager uses Engineer to
+ * GnomeEngineering manager uses Engineer to operate devices.
- * operate devices.
+ * 
- *
  */
 public class GnomeEngineeringManager implements Engineer {
 
 	private Engineer engineer;
-	
+
 	public GnomeEngineeringManager() {
 		engineer = new GnomeEngineer();
 	}
-	
+
 	@Override
 	public void operateDevice() {
 		engineer.operateDevice();

adapter/src/main/java/com/iluwatar/GoblinGlider.java

@@ -3,18 +3,18 @@ package com.iluwatar;
 /**
  * 
  * Device class (adaptee in the pattern).
- *
+ * 
  */
 public class GoblinGlider {
 
 	public void attachGlider() {
 		System.out.println("Glider attached.");
 	}
-	
+
 	public void gainSpeed() {
 		System.out.println("Gaining speed.");
 	}
-	
+
 	public void takeOff() {
 		System.out.println("Lift-off!");
 	}

bridge/src/main/java/com/iluwatar/App.java

@@ -1,32 +1,35 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * In Bridge pattern both abstraction (MagicWeapon) and implementation
  * (MagicWeaponImp) have their own class hierarchies. The interface of the
  * implementations can be changed without affecting the clients.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        BlindingMagicWeapon blindingMagicWeapon = new BlindingMagicWeapon(new Excalibur());
+		BlindingMagicWeapon blindingMagicWeapon = new BlindingMagicWeapon(
-        blindingMagicWeapon.wield();
+				new Excalibur());
-        blindingMagicWeapon.blind();
+		blindingMagicWeapon.wield();
-        blindingMagicWeapon.swing();
+		blindingMagicWeapon.blind();
-        blindingMagicWeapon.unwield();
+		blindingMagicWeapon.swing();
+		blindingMagicWeapon.unwield();
 
-        FlyingMagicWeapon flyingMagicWeapon = new FlyingMagicWeapon(new Mjollnir());
+		FlyingMagicWeapon flyingMagicWeapon = new FlyingMagicWeapon(
-        flyingMagicWeapon.wield();
+				new Mjollnir());
-        flyingMagicWeapon.fly();
+		flyingMagicWeapon.wield();
-        flyingMagicWeapon.swing();
+		flyingMagicWeapon.fly();
-        flyingMagicWeapon.unwield();
+		flyingMagicWeapon.swing();
+		flyingMagicWeapon.unwield();
 
-        SoulEatingMagicWeapon soulEatingMagicWeapon = new SoulEatingMagicWeapon(new Stormbringer());
+		SoulEatingMagicWeapon soulEatingMagicWeapon = new SoulEatingMagicWeapon(
-        soulEatingMagicWeapon.wield();
+				new Stormbringer());
-        soulEatingMagicWeapon.swing();
+		soulEatingMagicWeapon.wield();
-        soulEatingMagicWeapon.eatSoul();
+		soulEatingMagicWeapon.swing();
-        soulEatingMagicWeapon.unwield();
+		soulEatingMagicWeapon.eatSoul();
+		soulEatingMagicWeapon.unwield();
 
-    }
+	}
 }

bridge/src/main/java/com/iluwatar/BlindingMagicWeapon.java

@@ -10,7 +10,7 @@ public class BlindingMagicWeapon extends MagicWeapon {
 	public BlindingMagicWeaponImp getImp() {
 		return (BlindingMagicWeaponImp) imp;
 	}
-	
+
 	@Override
 	public void wield() {
 		getImp().wieldImp();
@@ -29,5 +29,5 @@ public class BlindingMagicWeapon extends MagicWeapon {
 	public void blind() {
 		getImp().blindImp();
 	}
-	
+
 }

bridge/src/main/java/com/iluwatar/Excalibur.java

@@ -19,7 +19,8 @@ public class Excalibur extends BlindingMagicWeaponImp {
 
 	@Override
 	public void blindImp() {
-		System.out.println("bright light streams from Excalibur blinding the enemy");
+		System.out
+				.println("bright light streams from Excalibur blinding the enemy");
 	}
 
 }

bridge/src/main/java/com/iluwatar/FlyingMagicWeapon.java

@@ -5,11 +5,11 @@ public class FlyingMagicWeapon extends MagicWeapon {
 	public FlyingMagicWeapon(FlyingMagicWeaponImp imp) {
 		super(imp);
 	}
-	
+
 	public FlyingMagicWeaponImp getImp() {
 		return (FlyingMagicWeaponImp) imp;
 	}
-	
+
 	@Override
 	public void wield() {
 		getImp().wieldImp();
@@ -28,5 +28,5 @@ public class FlyingMagicWeapon extends MagicWeapon {
 	public void fly() {
 		getImp().flyImp();
 	}
-	
+
 }

bridge/src/main/java/com/iluwatar/MagicWeapon.java

@@ -3,24 +3,24 @@ package com.iluwatar;
 /**
  * 
  * Abstraction interface.
- *
+ * 
  */
 public abstract class MagicWeapon {
 
 	protected MagicWeaponImp imp;
-	
+
 	public MagicWeapon(MagicWeaponImp imp) {
 		this.imp = imp;
 	}
-	
+
 	public abstract void wield();
-	
+
 	public abstract void swing();
-	
+
 	public abstract void unwield();
-	
+
 	public MagicWeaponImp getImp() {
 		return imp;
 	}
-	
+
 }

bridge/src/main/java/com/iluwatar/MagicWeaponImp.java

@@ -3,14 +3,14 @@ package com.iluwatar;
 /**
  * 
  * Implementation interface.
- *
+ * 
  */
 public abstract class MagicWeaponImp {
 
 	public abstract void wieldImp();
-	
+
 	public abstract void swingImp();
-	
+
 	public abstract void unwieldImp();
-	
+
 }

bridge/src/main/java/com/iluwatar/Mjollnir.java

@@ -19,7 +19,8 @@ public class Mjollnir extends FlyingMagicWeaponImp {
 
 	@Override
 	public void flyImp() {
-		System.out.println("Mjollnir hits the enemy in the air and returns back to the owner's hand");
+		System.out
+				.println("Mjollnir hits the enemy in the air and returns back to the owner's hand");
 	}
 
 }

bridge/src/main/java/com/iluwatar/SoulEatingMagicWeapon.java

@@ -5,12 +5,12 @@ public class SoulEatingMagicWeapon extends MagicWeapon {
 	public SoulEatingMagicWeapon(SoulEatingMagicWeaponImp imp) {
 		super(imp);
 	}
-	
+
 	@Override
 	public SoulEatingMagicWeaponImp getImp() {
 		return (SoulEatingMagicWeaponImp) imp;
 	}
-	
+
 	@Override
 	public void wield() {
 		getImp().wieldImp();
@@ -29,5 +29,5 @@ public class SoulEatingMagicWeapon extends MagicWeapon {
 	public void eatSoul() {
 		getImp().eatSoulImp();
 	}
-	
+
 }

bridge/src/main/java/com/iluwatar/SoulEatingMagicWeaponImp.java

@@ -3,5 +3,5 @@ package com.iluwatar;
 public abstract class SoulEatingMagicWeaponImp extends MagicWeaponImp {
 
 	public abstract void eatSoulImp();
-	
+
 }

builder/src/main/java/com/iluwatar/App.java

@@ -3,41 +3,36 @@ package com.iluwatar;
 import com.iluwatar.Hero.HeroBuilder;
 
 /**
- *
+ * 
  * This is the Builder pattern variation as described by Joshua Bloch in
  * Effective Java 2nd Edition.
- *
+ * 
  * We want to build Hero objects, but its construction is complex because of the
  * many parameters needed. To aid the user we introduce HeroBuilder class.
  * HeroBuilder takes the minimum parameters to build Hero object in its
  * constructor. After that additional configuration for the Hero object can be
  * done using the fluent HeroBuilder interface. When configuration is ready the
  * build method is called to receive the final Hero object.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
 
-        Hero mage = new HeroBuilder(Profession.MAGE, "Riobard")
+		Hero mage = new HeroBuilder(Profession.MAGE, "Riobard")
-                .withHairColor(HairColor.BLACK)
+				.withHairColor(HairColor.BLACK).withWeapon(Weapon.DAGGER)
-                .withWeapon(Weapon.DAGGER)
+				.build();
-                .build();
+		System.out.println(mage);
-        System.out.println(mage);
 
-        Hero warrior = new HeroBuilder(Profession.WARRIOR, "Amberjill")
+		Hero warrior = new HeroBuilder(Profession.WARRIOR, "Amberjill")
-                .withHairColor(HairColor.BLOND)
+				.withHairColor(HairColor.BLOND)
-                .withHairType(HairType.LONG_CURLY)
+				.withHairType(HairType.LONG_CURLY).withArmor(Armor.CHAIN_MAIL)
-                .withArmor(Armor.CHAIN_MAIL)
+				.withWeapon(Weapon.SWORD).build();
-                .withWeapon(Weapon.SWORD)
+		System.out.println(warrior);
-                .build();
-        System.out.println(warrior);
 
-        Hero thief = new HeroBuilder(Profession.THIEF, "Desmond")
+		Hero thief = new HeroBuilder(Profession.THIEF, "Desmond")
-                .withHairType(HairType.BALD)
+				.withHairType(HairType.BALD).withWeapon(Weapon.BOW).build();
-                .withWeapon(Weapon.BOW)
+		System.out.println(thief);
-                .build();
-        System.out.println(thief);
 
-    }
+	}
 }

builder/src/main/java/com/iluwatar/Armor.java

@@ -3,17 +3,25 @@ package com.iluwatar;
 public enum Armor {
 
 	CLOTHES, LEATHER, CHAIN_MAIL, PLATE_MAIL;
-	
+
 	@Override
 	public String toString() {
 		String s = "";
-		switch(this) {
+		switch (this) {
-		case CLOTHES: s = "clothes"; break;
+		case CLOTHES:
-		case LEATHER: s = "leather armor"; break;
+			s = "clothes";
-		case CHAIN_MAIL: s = "chain mail"; break;
+			break;
-		case PLATE_MAIL: s = "plate mail"; break;
+		case LEATHER:
+			s = "leather armor";
+			break;
+		case CHAIN_MAIL:
+			s = "chain mail";
+			break;
+		case PLATE_MAIL:
+			s = "plate mail";
+			break;
 		}
 		return s;
 	}
-	
+
 }

builder/src/main/java/com/iluwatar/HairColor.java

@@ -3,18 +3,28 @@ package com.iluwatar;
 public enum HairColor {
 
 	WHITE, BLOND, RED, BROWN, BLACK;
-	
+
 	@Override
 	public String toString() {
 		String s = "";
-		switch(this) {
+		switch (this) {
-		case WHITE: s = "white"; break;
+		case WHITE:
-		case BLOND: s = "blond"; break;
+			s = "white";
-		case RED: s = "red"; break;
+			break;
-		case BROWN: s = "brown"; break;
+		case BLOND:
-		case BLACK: s = "black"; break;
+			s = "blond";
+			break;
+		case RED:
+			s = "red";
+			break;
+		case BROWN:
+			s = "brown";
+			break;
+		case BLACK:
+			s = "black";
+			break;
 		}
 		return s;
 	}
-	
+
 }

builder/src/main/java/com/iluwatar/HairType.java

@@ -7,14 +7,24 @@ public enum HairType {
 	@Override
 	public String toString() {
 		String s = "";
-		switch(this) {
+		switch (this) {
-		case BALD: s = "bold"; break;
+		case BALD:
-		case SHORT: s = "short"; break;
+			s = "bold";
-		case CURLY: s = "curly"; break;
+			break;
-		case LONG_STRAIGHT: s = "long straight"; break;
+		case SHORT:
-		case LONG_CURLY: s = "long curly"; break;
+			s = "short";
+			break;
+		case CURLY:
+			s = "curly";
+			break;
+		case LONG_STRAIGHT:
+			s = "long straight";
+			break;
+		case LONG_CURLY:
+			s = "long curly";
+			break;
 		}
 		return s;
 	}
-	
+
 }

builder/src/main/java/com/iluwatar/Hero.java

@@ -3,7 +3,7 @@ package com.iluwatar;
 /**
  * 
  * The class with many parameters.
- *
+ * 
  */
 public class Hero {
 
@@ -13,7 +13,7 @@ public class Hero {
 	private final HairColor hairColor;
 	private final Armor armor;
 	private final Weapon weapon;
-	
+
 	public Profession getProfession() {
 		return profession;
 	}
@@ -37,7 +37,7 @@ public class Hero {
 	public Weapon getWeapon() {
 		return weapon;
 	}
-	
+
 	@Override
 	public String toString() {
 
@@ -81,7 +81,7 @@ public class Hero {
 	/**
 	 * 
 	 * The builder class.
-	 *
+	 * 
 	 */
 	public static class HeroBuilder {
 
@@ -91,20 +91,21 @@ public class Hero {
 		private HairColor hairColor;
 		private Armor armor;
 		private Weapon weapon;
-		
+
 		public HeroBuilder(Profession profession, String name) {
 			if (profession == null || name == null) {
-				throw new NullPointerException("profession and name can not be null");
+				throw new NullPointerException(
+						"profession and name can not be null");
 			}
 			this.profession = profession;
 			this.name = name;
 		}
-		
+
 		public HeroBuilder withHairType(HairType hairType) {
 			this.hairType = hairType;
 			return this;
 		}
-		
+
 		public HeroBuilder withHairColor(HairColor hairColor) {
 			this.hairColor = hairColor;
 			return this;
@@ -114,12 +115,12 @@ public class Hero {
 			this.armor = armor;
 			return this;
 		}
-		
+
 		public HeroBuilder withWeapon(Weapon weapon) {
 			this.weapon = weapon;
 			return this;
 		}
-		
+
 		public Hero build() {
 			return new Hero(this);
 		}

builder/src/main/java/com/iluwatar/Profession.java

@@ -1,19 +1,27 @@
 package com.iluwatar;
 
 public enum Profession {
-	
+
 	WARRIOR, THIEF, MAGE, PRIEST;
 
 	@Override
 	public String toString() {
 		String s = "";
-		switch(this) {
+		switch (this) {
-		case WARRIOR: s = "Warrior"; break;
+		case WARRIOR:
-		case THIEF: s = "Thief"; break;
+			s = "Warrior";
-		case MAGE: s = "Mage"; break;
+			break;
-		case PRIEST: s = "Priest"; break;
+		case THIEF:
+			s = "Thief";
+			break;
+		case MAGE:
+			s = "Mage";
+			break;
+		case PRIEST:
+			s = "Priest";
+			break;
 		}
 		return s;
 	}
-	
+
 }

builder/src/main/java/com/iluwatar/Weapon.java

@@ -3,18 +3,28 @@ package com.iluwatar;
 public enum Weapon {
 
 	DAGGER, SWORD, AXE, WARHAMMER, BOW;
-	
+
 	@Override
 	public String toString() {
 		String s = "";
-		switch(this) {
+		switch (this) {
-		case DAGGER: s = "dagger"; break;
+		case DAGGER:
-		case SWORD: s = "sword"; break;
+			s = "dagger";
-		case AXE: s = "axe"; break;
+			break;
-		case WARHAMMER: s = "warhammer"; break;
+		case SWORD:
-		case BOW: s = "bow"; break;
+			s = "sword";
+			break;
+		case AXE:
+			s = "axe";
+			break;
+		case WARHAMMER:
+			s = "warhammer";
+			break;
+		case BOW:
+			s = "bow";
+			break;
 		}
 		return s;
 	}
-	
+
 }

chain/src/main/java/com/iluwatar/App.java

@@ -1,21 +1,22 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * Chain of Responsibility organizes request handlers (RequestHandler) into a
  * chain where each handler has a chance to act on the request on its turn. In
  * this example the king (OrcKing) makes requests and the military orcs
  * (OrcCommander, OrcOfficer, OrcSoldier) form the handler chain.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
 
-        OrcKing king = new OrcKing();
+		OrcKing king = new OrcKing();
-        king.makeRequest(new Request(RequestType.DEFEND_CASTLE, "defend castle"));
+		king.makeRequest(new Request(RequestType.DEFEND_CASTLE, "defend castle"));
-        king.makeRequest(new Request(RequestType.TORTURE_PRISONER, "torture prisoner"));
+		king.makeRequest(new Request(RequestType.TORTURE_PRISONER,
-        king.makeRequest(new Request(RequestType.COLLECT_TAX, "collect tax"));
+				"torture prisoner"));
+		king.makeRequest(new Request(RequestType.COLLECT_TAX, "collect tax"));
 
-    }
+	}
 }

chain/src/main/java/com/iluwatar/OrcCommander.java

@@ -5,7 +5,7 @@ public class OrcCommander extends RequestHandler {
 	public OrcCommander(RequestHandler handler) {
 		super(handler);
 	}
-	
+
 	@Override
 	public void handleRequest(Request req) {
 		if (req.getRequestType().equals(RequestType.DEFEND_CASTLE)) {

chain/src/main/java/com/iluwatar/OrcKing.java

@@ -3,22 +3,22 @@ package com.iluwatar;
 /**
  * 
  * Makes requests that are handled by the chain.
- *
+ * 
  */
 public class OrcKing {
 
 	RequestHandler chain;
-	
+
 	public OrcKing() {
 		buildChain();
 	}
-	
+
 	private void buildChain() {
 		chain = new OrcCommander(new OrcOfficer(new OrcSoldier(null)));
 	}
-	
+
 	public void makeRequest(Request req) {
 		chain.handleRequest(req);
 	}
-	
+
 }

chain/src/main/java/com/iluwatar/OrcOfficer.java

@@ -5,7 +5,7 @@ public class OrcOfficer extends RequestHandler {
 	public OrcOfficer(RequestHandler handler) {
 		super(handler);
 	}
-	
+
 	@Override
 	public void handleRequest(Request req) {
 		if (req.getRequestType().equals(RequestType.TORTURE_PRISONER)) {

chain/src/main/java/com/iluwatar/RequestHandler.java

@@ -1,13 +1,13 @@
 package com.iluwatar;
 
 public abstract class RequestHandler {
-	
+
 	private RequestHandler next;
 
 	public RequestHandler(RequestHandler next) {
 		this.next = next;
 	}
-	
+
 	public void handleRequest(Request req) {
 		if (next != null) {
 			next.handleRequest(req);

chain/src/main/java/com/iluwatar/RequestType.java

@@ -2,8 +2,6 @@ package com.iluwatar;
 
 public enum RequestType {
 
-	DEFEND_CASTLE,
+	DEFEND_CASTLE, TORTURE_PRISONER, COLLECT_TAX
-	TORTURE_PRISONER,
+
-	COLLECT_TAX
-	
 }

command/src/main/java/com/iluwatar/App.java

@@ -1,25 +1,25 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * In Command pattern actions are objects that can be executed and undone. The
  * commands in this example are spells cast by the wizard on the goblin.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        Wizard wizard = new Wizard();
+		Wizard wizard = new Wizard();
-        Goblin goblin = new Goblin();
+		Goblin goblin = new Goblin();
 
-        goblin.printStatus();
+		goblin.printStatus();
 
-        wizard.castSpell(new ShrinkSpell(), goblin);
+		wizard.castSpell(new ShrinkSpell(), goblin);
-        goblin.printStatus();
+		goblin.printStatus();
 
-        wizard.castSpell(new InvisibilitySpell(), goblin);
+		wizard.castSpell(new InvisibilitySpell(), goblin);
-        goblin.printStatus();
+		goblin.printStatus();
-        wizard.undoLastSpell();
+		wizard.undoLastSpell();
-        goblin.printStatus();
+		goblin.printStatus();
-    }
+	}
 }

command/src/main/java/com/iluwatar/Command.java

@@ -3,15 +3,15 @@ package com.iluwatar;
 /**
  * 
  * Interface for spells.
- *
+ * 
  */
 public abstract class Command {
 
 	public abstract void execute(Target target);
-	
+
 	public abstract void undo();
 
 	@Override
-	public abstract String toString();	
+	public abstract String toString();
-	
+
 }

command/src/main/java/com/iluwatar/Goblin.java

@@ -6,7 +6,7 @@ public class Goblin extends Target {
 		this.setSize(Size.NORMAL);
 		this.setVisibility(Visibility.VISIBLE);
 	}
-	
+
 	@Override
 	public String toString() {
 		return "Goblin";

command/src/main/java/com/iluwatar/InvisibilitySpell.java

@@ -3,11 +3,11 @@ package com.iluwatar;
 public class InvisibilitySpell extends Command {
 
 	private Target target;
-	
+
 	public InvisibilitySpell() {
 		target = null;
 	}
-	
+
 	@Override
 	public void execute(Target target) {
 		target.setVisibility(Visibility.INVISIBLE);

command/src/main/java/com/iluwatar/ShrinkSpell.java

@@ -3,14 +3,14 @@ package com.iluwatar;
 public class ShrinkSpell extends Command {
 
 	private Size oldSize;
-	
+
 	private Target target;
-	
+
 	public ShrinkSpell() {
 		oldSize = null;
 		target = null;
 	}
-	
+
 	@Override
 	public void execute(Target target) {
 		oldSize = target.getSize();

command/src/main/java/com/iluwatar/Size.java

@@ -2,15 +2,13 @@ package com.iluwatar;
 
 public enum Size {
 
-	SMALL,
+	SMALL, NORMAL, LARGE;
-	NORMAL,
-	LARGE;
 
 	@Override
 	public String toString() {
-		
+
 		String s = "";
-		
+
 		switch (this) {
 		case LARGE:
 			s = "large";
@@ -27,5 +25,4 @@ public enum Size {
 		return s;
 	}
 
-	
 }

command/src/main/java/com/iluwatar/Target.java

@@ -5,7 +5,7 @@ public abstract class Target {
 	private Size size;
 
 	private Visibility visibility;
-	
+
 	public Size getSize() {
 		return size;
 	}
@@ -24,8 +24,9 @@ public abstract class Target {
 
 	@Override
 	public abstract String toString();
-	
+
 	public void printStatus() {
-		System.out.println(String.format("%s, size=%s visibility=%s", this, getSize(), getVisibility()));
+		System.out.println(String.format("%s, size=%s visibility=%s", this,
+				getSize(), getVisibility()));
 	}
 }

command/src/main/java/com/iluwatar/Visibility.java

@@ -2,14 +2,13 @@ package com.iluwatar;
 
 public enum Visibility {
 
-	VISIBLE,
+	VISIBLE, INVISIBLE;
-	INVISIBLE;
 
 	@Override
 	public String toString() {
-		
+
 		String s = "";
-		
+
 		switch (this) {
 		case INVISIBLE:
 			s = "invisible";
@@ -19,7 +18,7 @@ public enum Visibility {
 			break;
 		default:
 			break;
-		
+
 		}
 		return s;
 	}

command/src/main/java/com/iluwatar/Wizard.java

@@ -3,13 +3,13 @@ package com.iluwatar;
 public class Wizard extends Target {
 
 	private Command previousSpell;
-	
+
 	public Wizard() {
 		this.setSize(Size.NORMAL);
 		this.setVisibility(Visibility.VISIBLE);
 		previousSpell = null;
 	}
-	
+
 	public void castSpell(Command command, Target target) {
 		System.out.println(this + " casts " + command + " at " + target);
 		command.execute(target);
@@ -22,10 +22,10 @@ public class Wizard extends Target {
 			previousSpell.undo();
 		}
 	}
-	
+
 	@Override
 	public String toString() {
 		return "Wizard";
 	}
-	
+
 }

composite/src/main/java/com/iluwatar/App.java

@@ -1,25 +1,25 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * With Composite we can treat tree hierarchies of objects with uniform
  * interface (LetterComposite). In this example we have sentences composed of
  * words composed of letters.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        System.out.println("Message from the orcs: ");
+		System.out.println("Message from the orcs: ");
 
-        LetterComposite orcMessage = new Messenger().messageFromOrcs();
+		LetterComposite orcMessage = new Messenger().messageFromOrcs();
-        orcMessage.print();
+		orcMessage.print();
 
-        System.out.println("\n");
+		System.out.println("\n");
 
-        System.out.println("Message from the elves: ");
+		System.out.println("Message from the elves: ");
 
-        LetterComposite elfMessage = new Messenger().messageFromElves();
+		LetterComposite elfMessage = new Messenger().messageFromElves();
-        elfMessage.print();
+		elfMessage.print();
-    }
+	}
 }

composite/src/main/java/com/iluwatar/LetterComposite.java

@@ -6,7 +6,7 @@ import java.util.List;
 /**
  * 
  * Composite interface.
- *
+ * 
  */
 public abstract class LetterComposite {
 
@@ -15,18 +15,18 @@ public abstract class LetterComposite {
 	public void add(LetterComposite letter) {
 		children.add(letter);
 	}
-	
+
 	public int count() {
 		return children.size();
 	}
-	
+
 	protected abstract void printThisBefore();
 
 	protected abstract void printThisAfter();
-	
+
 	public void print() {
 		printThisBefore();
-		for (LetterComposite letter: children) {
+		for (LetterComposite letter : children) {
 			letter.print();
 		}
 		printThisAfter();

composite/src/main/java/com/iluwatar/Messenger.java

@@ -7,36 +7,47 @@ import java.util.List;
 public class Messenger {
 
 	LetterComposite messageFromOrcs() {
-		
+
 		List<Word> words = new ArrayList<Word>();
-		
+
-		words.add(new Word(Arrays.asList(new Letter('W'), new Letter('h'), new Letter('e'), new Letter('r'), new Letter('e'))));
+		words.add(new Word(Arrays.asList(new Letter('W'), new Letter('h'),
-		words.add(new Word(Arrays.asList(new Letter('t'), new Letter('h'), new Letter('e'), new Letter('r'), new Letter('e'))));
+				new Letter('e'), new Letter('r'), new Letter('e'))));
+		words.add(new Word(Arrays.asList(new Letter('t'), new Letter('h'),
+				new Letter('e'), new Letter('r'), new Letter('e'))));
 		words.add(new Word(Arrays.asList(new Letter('i'), new Letter('s'))));
 		words.add(new Word(Arrays.asList(new Letter('a'))));
-		words.add(new Word(Arrays.asList(new Letter('w'), new Letter('h'), new Letter('i'), new Letter('p'))));
+		words.add(new Word(Arrays.asList(new Letter('w'), new Letter('h'),
-		words.add(new Word(Arrays.asList(new Letter('t'), new Letter('h'), new Letter('e'), new Letter('r'), new Letter('e'))));
+				new Letter('i'), new Letter('p'))));
+		words.add(new Word(Arrays.asList(new Letter('t'), new Letter('h'),
+				new Letter('e'), new Letter('r'), new Letter('e'))));
 		words.add(new Word(Arrays.asList(new Letter('i'), new Letter('s'))));
 		words.add(new Word(Arrays.asList(new Letter('a'))));
-		words.add(new Word(Arrays.asList(new Letter('w'), new Letter('a'), new Letter('y'))));
+		words.add(new Word(Arrays.asList(new Letter('w'), new Letter('a'),
-		
+				new Letter('y'))));
+
 		return new Sentence(words);
-		
+
 	}
 
 	LetterComposite messageFromElves() {
-		
+
 		List<Word> words = new ArrayList<Word>();
-		
+
-		words.add(new Word(Arrays.asList(new Letter('M'), new Letter('u'), new Letter('c'), new Letter('h'))));
+		words.add(new Word(Arrays.asList(new Letter('M'), new Letter('u'),
-		words.add(new Word(Arrays.asList(new Letter('w'), new Letter('i'), new Letter('n'), new Letter('d'))));
+				new Letter('c'), new Letter('h'))));
-		words.add(new Word(Arrays.asList(new Letter('p'), new Letter('o'), new Letter('u'), new Letter('r'), new Letter('s'))));
+		words.add(new Word(Arrays.asList(new Letter('w'), new Letter('i'),
-		words.add(new Word(Arrays.asList(new Letter('f'), new Letter('r'), new Letter('o'), new Letter('m'))));
+				new Letter('n'), new Letter('d'))));
-		words.add(new Word(Arrays.asList(new Letter('y'), new Letter('o'), new Letter('u'), new Letter('r'))));
+		words.add(new Word(Arrays.asList(new Letter('p'), new Letter('o'),
-		words.add(new Word(Arrays.asList(new Letter('m'), new Letter('o'), new Letter('u'), new Letter('t'), new Letter('h'))));
+				new Letter('u'), new Letter('r'), new Letter('s'))));
-		
+		words.add(new Word(Arrays.asList(new Letter('f'), new Letter('r'),
+				new Letter('o'), new Letter('m'))));
+		words.add(new Word(Arrays.asList(new Letter('y'), new Letter('o'),
+				new Letter('u'), new Letter('r'))));
+		words.add(new Word(Arrays.asList(new Letter('m'), new Letter('o'),
+				new Letter('u'), new Letter('t'), new Letter('h'))));
+
 		return new Sentence(words);
-		
+
 	}
-	
+
 }

composite/src/main/java/com/iluwatar/Sentence.java

@@ -5,11 +5,11 @@ import java.util.List;
 public class Sentence extends LetterComposite {
 
 	public Sentence(List<Word> words) {
-		for (Word w: words) {
+		for (Word w : words) {
 			this.add(w);
 		}
 	}
-	
+
 	@Override
 	protected void printThisBefore() {
 		// nop
@@ -20,5 +20,4 @@ public class Sentence extends LetterComposite {
 		System.out.print(".");
 	}
 
-
 }

composite/src/main/java/com/iluwatar/Word.java

@@ -5,11 +5,11 @@ import java.util.List;
 public class Word extends LetterComposite {
 
 	public Word(List<Letter> letters) {
-		for (Letter l: letters) {
+		for (Letter l : letters) {
 			this.add(l);
 		}
 	}
-	
+
 	@Override
 	protected void printThisBefore() {
 		System.out.print(" ");

decorator/src/main/java/com/iluwatar/App.java

@@ -1,24 +1,24 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * Decorator pattern is more flexible alternative to subclassing. The decorator
  * class implements the same interface as the target and uses composition to
  * "decorate" calls to the target.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
 
-        System.out.println("A simple looking troll approaches.");
+		System.out.println("A simple looking troll approaches.");
-        Hostile troll = new Troll();
+		Hostile troll = new Troll();
-        troll.attack();
+		troll.attack();
-        troll.fleeBattle();
+		troll.fleeBattle();
 
-        System.out.println("\nA smart looking troll surprises you.");
+		System.out.println("\nA smart looking troll surprises you.");
-        Hostile smart = new SmartTroll(new Troll());
+		Hostile smart = new SmartTroll(new Troll());
-        smart.attack();
+		smart.attack();
-        smart.fleeBattle();
+		smart.fleeBattle();
-    }
+	}
 }

decorator/src/main/java/com/iluwatar/Hostile.java

@@ -3,6 +3,7 @@ package com.iluwatar;
 public interface Hostile {
 
 	void attack();
+
 	void fleeBattle();
-	
+
 }

decorator/src/main/java/com/iluwatar/SmartTroll.java

@@ -7,7 +7,7 @@ public class SmartTroll implements Hostile {
 	public SmartTroll(Hostile decorated) {
 		this.decorated = decorated;
 	}
-	
+
 	@Override
 	public void attack() {
 		System.out.println("The troll throws a rock at you!");
@@ -19,5 +19,5 @@ public class SmartTroll implements Hostile {
 		System.out.println("The troll calls for help!");
 		decorated.fleeBattle();
 	}
-	
+
 }

decorator/src/main/java/com/iluwatar/Troll.java

@@ -5,9 +5,9 @@ public class Troll implements Hostile {
 	public void attack() {
 		System.out.println("The troll swings at you with a club!");
 	}
-	
+
 	public void fleeBattle() {
 		System.out.println("The troll shrieks in horror and runs away!");
 	}
-	
+
 }

double-checked-locking/src/main/java/com/iluwatar/App.java

@@ -4,7 +4,7 @@ import java.util.concurrent.ExecutorService;
 import java.util.concurrent.Executors;
 
 /**
- *
+ * 
  * In Inventory we store the items with a given size. However, we do not store
  * more items than the inventory size. To address concurrent access problems we
  * use double checked locking to add item to inventory. In this method, the
@@ -12,16 +12,17 @@ import java.util.concurrent.Executors;
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        final Inventory inventory = new Inventory(1000);
+		final Inventory inventory = new Inventory(1000);
-        ExecutorService executorService = Executors.newFixedThreadPool(3);
+		ExecutorService executorService = Executors.newFixedThreadPool(3);
-        for (int i = 0; i < 3; i++) {
+		for (int i = 0; i < 3; i++) {
-            executorService.execute(new Runnable() {
+			executorService.execute(new Runnable() {
-                @Override
+				@Override
-                public void run() {
+				public void run() {
-                    while (inventory.addItem(new Item()));
+					while (inventory.addItem(new Item()))
-                }
+						;
-            });
+				}
-        }
+			});
-    }
+		}
+	}
 }

double-checked-locking/src/main/java/com/iluwatar/Inventory.java

@@ -5,9 +5,8 @@ import java.util.List;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 
-
 public class Inventory {
-	
+
 	private int inventorySize;
 	private List<Item> items;
 	private Lock lock = new ReentrantLock();
@@ -16,17 +15,17 @@ public class Inventory {
 		this.inventorySize = inventorySize;
 		this.items = new ArrayList<Item>(inventorySize);
 	}
-	
+
-	public boolean addItem(Item item){
+	public boolean addItem(Item item) {
-		if(items.size()<inventorySize){
+		if (items.size() < inventorySize) {
 			lock.lock();
-			try{
+			try {
-				if(items.size()<inventorySize){
+				if (items.size() < inventorySize) {
 					items.add(item);
 					System.out.println(Thread.currentThread());
 					return true;
 				}
-			}finally{
+			} finally {
 				lock.unlock();
 			}
 		}

facade/src/main/java/com/iluwatar/App.java

@@ -1,16 +1,16 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * Facade (DwarvenGoldmineFacade) provides simpler interface to subsystem.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        DwarvenGoldmineFacade facade = new DwarvenGoldmineFacade();
+		DwarvenGoldmineFacade facade = new DwarvenGoldmineFacade();
-        facade.startNewDay();
+		facade.startNewDay();
-        facade.digOutGold();
+		facade.digOutGold();
-        facade.endDay();
+		facade.endDay();
-    }
+	}
 }

facade/src/main/java/com/iluwatar/DwarvenGoldmineFacade.java

@@ -6,32 +6,32 @@ import java.util.List;
 public class DwarvenGoldmineFacade {
 
 	List<DwarvenMineWorker> workers;
-	
+
 	public DwarvenGoldmineFacade() {
 		workers = new ArrayList<>();
 		workers.add(new DwarvenGoldDigger());
 		workers.add(new DwarvenCartOperator());
 		workers.add(new DwarvenTunnelDigger());
 	}
-	
+
 	public void startNewDay() {
-		for (DwarvenMineWorker worker: workers) {
+		for (DwarvenMineWorker worker : workers) {
 			worker.wakeUp();
 			worker.goToMine();
 		}
 	}
-	
+
 	public void digOutGold() {
-		for (DwarvenMineWorker worker: workers) {
+		for (DwarvenMineWorker worker : workers) {
 			worker.work();
 		}
 	}
-	
+
 	public void endDay() {
-		for (DwarvenMineWorker worker: workers) {
+		for (DwarvenMineWorker worker : workers) {
 			worker.goHome();
 			worker.goToSleep();
 		}
 	}
-	
+
 }

facade/src/main/java/com/iluwatar/DwarvenMineWorker.java

@@ -5,21 +5,21 @@ public abstract class DwarvenMineWorker {
 	public void goToSleep() {
 		System.out.println(name() + " goes to sleep.");
 	}
-	
+
 	public void wakeUp() {
 		System.out.println(name() + " wakes up.");
 	}
-	
+
 	public void goHome() {
 		System.out.println(name() + " goes home.");
 	}
-	
+
 	public void goToMine() {
 		System.out.println(name() + " goes to the mine.");
 	}
-	
+
 	public abstract void work();
-	
+
 	public abstract String name();
-	
+
 }

factory-method/src/main/java/com/iluwatar/App.java

@@ -1,28 +1,28 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * In Factory Method we have an interface (Blacksmith) with a method for
  * creating objects (manufactureWeapon). The concrete subclasses (OrcBlacksmith,
  * ElfBlacksmith) then override the method to produce objects of their liking.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        Blacksmith blacksmith;
+		Blacksmith blacksmith;
-        Weapon weapon;
+		Weapon weapon;
 
-        blacksmith = new OrcBlacksmith();
+		blacksmith = new OrcBlacksmith();
-        weapon = blacksmith.manufactureWeapon(WeaponType.SPEAR);
+		weapon = blacksmith.manufactureWeapon(WeaponType.SPEAR);
-        System.out.println(weapon);
+		System.out.println(weapon);
-        weapon = blacksmith.manufactureWeapon(WeaponType.AXE);
+		weapon = blacksmith.manufactureWeapon(WeaponType.AXE);
-        System.out.println(weapon);
+		System.out.println(weapon);
 
-        blacksmith = new ElfBlacksmith();
+		blacksmith = new ElfBlacksmith();
-        weapon = blacksmith.manufactureWeapon(WeaponType.SHORT_SWORD);
+		weapon = blacksmith.manufactureWeapon(WeaponType.SHORT_SWORD);
-        System.out.println(weapon);
+		System.out.println(weapon);
-        weapon = blacksmith.manufactureWeapon(WeaponType.SPEAR);
+		weapon = blacksmith.manufactureWeapon(WeaponType.SPEAR);
-        System.out.println(weapon);
+		System.out.println(weapon);
-    }
+	}
 }

factory-method/src/main/java/com/iluwatar/Blacksmith.java

@@ -3,10 +3,10 @@ package com.iluwatar;
 /**
  * 
  * The interface containing method for producing objects.
- *
+ * 
  */
 public interface Blacksmith {
 
 	Weapon manufactureWeapon(WeaponType weaponType);
-	
+
 }

factory-method/src/main/java/com/iluwatar/ElfBlacksmith.java

@@ -3,7 +3,7 @@ package com.iluwatar;
 /**
  * 
  * Concrete subclass for creating new objects.
- *
+ * 
  */
 public class ElfBlacksmith implements Blacksmith {
 

factory-method/src/main/java/com/iluwatar/ElfWeapon.java

@@ -12,5 +12,5 @@ public class ElfWeapon implements Weapon {
 	public String toString() {
 		return "Elven " + weaponType;
 	}
-	
+
 }

factory-method/src/main/java/com/iluwatar/OrcBlacksmith.java

@@ -3,7 +3,7 @@ package com.iluwatar;
 /**
  * 
  * Concrete subclass for creating new objects.
- *
+ * 
  */
 public class OrcBlacksmith implements Blacksmith {
 

factory-method/src/main/java/com/iluwatar/OrcWeapon.java

@@ -12,5 +12,5 @@ public class OrcWeapon implements Weapon {
 	public String toString() {
 		return "Orcish " + weaponType;
 	}
-	
+
 }

factory-method/src/main/java/com/iluwatar/WeaponType.java

@@ -7,13 +7,18 @@ public enum WeaponType {
 	@Override
 	public String toString() {
 		String s = "";
-		switch(this) {
+		switch (this) {
-		case SHORT_SWORD: s = "short sword"; break;
+		case SHORT_SWORD:
-		case SPEAR: s = "spear"; break;
+			s = "short sword";
-		case AXE: s = "axe"; break;
+			break;
+		case SPEAR:
+			s = "spear";
+			break;
+		case AXE:
+			s = "axe";
+			break;
 		}
 		return s;
 	}
-	
+
-	
 }

flyweight/src/main/java/com/iluwatar/AlchemistShop.java

@@ -6,13 +6,13 @@ import java.util.List;
 /**
  * 
  * The class that needs many objects.
- *
+ * 
  */
 public class AlchemistShop {
 
 	List<Potion> topShelf;
 	List<Potion> bottomShelf;
-	
+
 	public AlchemistShop() {
 		topShelf = new ArrayList<>();
 		bottomShelf = new ArrayList<>();
@@ -20,9 +20,9 @@ public class AlchemistShop {
 	}
 
 	private void fillShelves() {
-		
+
 		PotionFactory factory = new PotionFactory();
-		
+
 		topShelf.add(factory.createPotion(PotionType.INVISIBILITY));
 		topShelf.add(factory.createPotion(PotionType.INVISIBILITY));
 		topShelf.add(factory.createPotion(PotionType.STRENGTH));
@@ -31,27 +31,27 @@ public class AlchemistShop {
 		topShelf.add(factory.createPotion(PotionType.STRENGTH));
 		topShelf.add(factory.createPotion(PotionType.HEALING));
 		topShelf.add(factory.createPotion(PotionType.HEALING));
-		
+
 		bottomShelf.add(factory.createPotion(PotionType.POISON));
 		bottomShelf.add(factory.createPotion(PotionType.POISON));
 		bottomShelf.add(factory.createPotion(PotionType.POISON));
 		bottomShelf.add(factory.createPotion(PotionType.HOLY_WATER));
 		bottomShelf.add(factory.createPotion(PotionType.HOLY_WATER));
 	}
-	
+
 	public void enumerate() {
 
 		System.out.println("Enumerating top shelf potions\n");
-		
+
-		for (Potion p: topShelf) {
+		for (Potion p : topShelf) {
 			p.drink();
 		}
-		
+
 		System.out.println("\nEnumerating bottom shelf potions\n");
-		
+
-		for (Potion p: bottomShelf) {
+		for (Potion p : bottomShelf) {
 			p.drink();
 		}
-		
+
 	}
 }

flyweight/src/main/java/com/iluwatar/App.java

@@ -1,16 +1,16 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * Flyweight (PotionFactory) is useful when there is plethora of objects
  * (Potion). It provides means to decrease resource usage by sharing object
  * instances.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        AlchemistShop alchemistShop = new AlchemistShop();
+		AlchemistShop alchemistShop = new AlchemistShop();
-        alchemistShop.enumerate();
+		alchemistShop.enumerate();
-    }
+	}
 }

flyweight/src/main/java/com/iluwatar/HealingPotion.java

@@ -4,7 +4,8 @@ public class HealingPotion implements Potion {
 
 	@Override
 	public void drink() {
-		System.out.println("You feel healed. (Potion=" + System.identityHashCode(this) + ")");
+		System.out.println("You feel healed. (Potion="
+				+ System.identityHashCode(this) + ")");
 	}
 
 }

flyweight/src/main/java/com/iluwatar/HolyWaterPotion.java

@@ -4,7 +4,8 @@ public class HolyWaterPotion implements Potion {
 
 	@Override
 	public void drink() {
-		System.out.println("You feel blessed. (Potion=" + System.identityHashCode(this) + ")");
+		System.out.println("You feel blessed. (Potion="
+				+ System.identityHashCode(this) + ")");
 	}
 
 }

flyweight/src/main/java/com/iluwatar/InvisibilityPotion.java

@@ -4,7 +4,8 @@ public class InvisibilityPotion implements Potion {
 
 	@Override
 	public void drink() {
-		System.out.println("You become invisible. (Potion=" + System.identityHashCode(this) + ")");
+		System.out.println("You become invisible. (Potion="
+				+ System.identityHashCode(this) + ")");
 	}
 
 }

flyweight/src/main/java/com/iluwatar/PoisonPotion.java

@@ -4,7 +4,8 @@ public class PoisonPotion implements Potion {
 
 	@Override
 	public void drink() {
-		System.out.println("Urgh! This is poisonous. (Potion=" + System.identityHashCode(this) + ")");
+		System.out.println("Urgh! This is poisonous. (Potion="
+				+ System.identityHashCode(this) + ")");
 	}
 
 }

flyweight/src/main/java/com/iluwatar/Potion.java

@@ -3,10 +3,10 @@ package com.iluwatar;
 /**
  * 
  * Interface for objects.
- *
+ * 
  */
 public interface Potion {
 
 	public void drink();
-	
+
 }

flyweight/src/main/java/com/iluwatar/PotionFactory.java

@@ -5,16 +5,16 @@ import java.util.EnumMap;
 /**
  * 
  * Flyweight.
- *
+ * 
  */
 public class PotionFactory {
 
 	private EnumMap<PotionType, Potion> potions;
-	
+
 	public PotionFactory() {
 		potions = new EnumMap<>(PotionType.class);
 	}
-	
+
 	Potion createPotion(PotionType type) {
 		Potion potion = potions.get(type);
 		if (potion == null) {
@@ -45,5 +45,5 @@ public class PotionFactory {
 		}
 		return potion;
 	}
-	
+
 }

flyweight/src/main/java/com/iluwatar/PotionType.java

@@ -2,10 +2,6 @@ package com.iluwatar;
 
 public enum PotionType {
 
-	HEALING,
+	HEALING, INVISIBILITY, STRENGTH, HOLY_WATER, POISON;
-	INVISIBILITY,
+
-	STRENGTH,
-	HOLY_WATER,
-	POISON;
-	
 }

flyweight/src/main/java/com/iluwatar/StrengthPotion.java

@@ -4,7 +4,8 @@ public class StrengthPotion implements Potion {
 
 	@Override
 	public void drink() {
-		System.out.println("You feel strong. (Potion=" + System.identityHashCode(this) + ")");
+		System.out.println("You feel strong. (Potion="
+				+ System.identityHashCode(this) + ")");
 	}
 
 }

interpreter/src/main/java/com/iluwatar/App.java

@@ -3,64 +3,70 @@ package com.iluwatar;
 import java.util.Stack;
 
 /**
- *
+ * 
  * Interpreter pattern breaks sentences into expressions (Expression) that can
  * be evaluated and as a whole form the result.
- *
+ * 
  */
 public class App {
 
-    /**
+	/**
-     *
+	 * 
-     * Expressions can be evaluated using prefix, infix or postfix notations
+	 * Expressions can be evaluated using prefix, infix or postfix notations
-     * This sample uses postfix, where operator comes after the operands
+	 * This sample uses postfix, where operator comes after the operands
-     *
+	 * 
-     */
+	 */
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        String tokenString = "4 3 2 - 1 + *";
+		String tokenString = "4 3 2 - 1 + *";
-        Stack<Expression> stack = new Stack<>();
+		Stack<Expression> stack = new Stack<>();
 
-        String[] tokenList = tokenString.split(" ");
+		String[] tokenList = tokenString.split(" ");
-        for (String s : tokenList) {
+		for (String s : tokenList) {
-            if (isOperator(s)) {
+			if (isOperator(s)) {
-                Expression rightExpression = stack.pop();
+				Expression rightExpression = stack.pop();
-                Expression leftExpression = stack.pop();
+				Expression leftExpression = stack.pop();
-                System.out.println(String.format("popped from stack left: %d right: %d",
+				System.out
-                        leftExpression.interpret(), rightExpression.interpret()));
+						.println(String.format(
-                Expression operator = getOperatorInstance(s, leftExpression,
+								"popped from stack left: %d right: %d",
-                        rightExpression);
+								leftExpression.interpret(),
-                System.out.println(String.format("operator: %s", operator));
+								rightExpression.interpret()));
-                int result = operator.interpret();
+				Expression operator = getOperatorInstance(s, leftExpression,
-                NumberExpression resultExpression = new NumberExpression(result);
+						rightExpression);
-                stack.push(resultExpression);
+				System.out.println(String.format("operator: %s", operator));
-                System.out.println(String.format("push result to stack: %d", resultExpression.interpret()));
+				int result = operator.interpret();
-            } else {
+				NumberExpression resultExpression = new NumberExpression(result);
-                Expression i = new NumberExpression(s);
+				stack.push(resultExpression);
-                stack.push(i);
+				System.out.println(String.format("push result to stack: %d",
-                System.out.println(String.format("push to stack: %d", i.interpret()));
+						resultExpression.interpret()));
-            }
+			} else {
-        }
+				Expression i = new NumberExpression(s);
-        System.out.println(String.format("result: %d", stack.pop().interpret()));
+				stack.push(i);
-    }
+				System.out.println(String.format("push to stack: %d",
+						i.interpret()));
+			}
+		}
+		System.out
+				.println(String.format("result: %d", stack.pop().interpret()));
+	}
 
-    public static boolean isOperator(String s) {
+	public static boolean isOperator(String s) {
-        if (s.equals("+") || s.equals("-") || s.equals("*")) {
+		if (s.equals("+") || s.equals("-") || s.equals("*")) {
-            return true;
+			return true;
-        } else {
+		} else {
-            return false;
+			return false;
-        }
+		}
-    }
+	}
 
-    public static Expression getOperatorInstance(String s, Expression left,
+	public static Expression getOperatorInstance(String s, Expression left,
-            Expression right) {
+			Expression right) {
-        switch (s) {
+		switch (s) {
-            case "+":
+		case "+":
-                return new PlusExpression(left, right);
+			return new PlusExpression(left, right);
-            case "-":
+		case "-":
-                return new MinusExpression(left, right);
+			return new MinusExpression(left, right);
-            case "*":
+		case "*":
-                return new MultiplyExpression(left, right);
+			return new MultiplyExpression(left, right);
-        }
+		}
-        return null;
+		return null;
-    }
+	}
 }

interpreter/src/main/java/com/iluwatar/Expression.java

@@ -3,7 +3,7 @@ package com.iluwatar;
 public abstract class Expression {
 
 	public abstract int interpret();
-	
+
 	@Override
 	public abstract String toString();
 }

interpreter/src/main/java/com/iluwatar/MinusExpression.java

@@ -9,7 +9,7 @@ public class MinusExpression extends Expression {
 		this.leftExpression = leftExpression;
 		this.rightExpression = rightExpression;
 	}
-	
+
 	@Override
 	public int interpret() {
 		return leftExpression.interpret() - rightExpression.interpret();

interpreter/src/main/java/com/iluwatar/MultiplyExpression.java

@@ -5,11 +5,12 @@ public class MultiplyExpression extends Expression {
 	private Expression leftExpression;
 	private Expression rightExpression;
 
-	public MultiplyExpression(Expression leftExpression, Expression rightExpression) {
+	public MultiplyExpression(Expression leftExpression,
+			Expression rightExpression) {
 		this.leftExpression = leftExpression;
 		this.rightExpression = rightExpression;
 	}
-	
+
 	@Override
 	public int interpret() {
 		return leftExpression.interpret() * rightExpression.interpret();

interpreter/src/main/java/com/iluwatar/NumberExpression.java

@@ -7,11 +7,11 @@ public class NumberExpression extends Expression {
 	public NumberExpression(int number) {
 		this.number = number;
 	}
-	
+
 	public NumberExpression(String s) {
 		this.number = Integer.parseInt(s);
 	}
-	
+
 	@Override
 	public int interpret() {
 		return number;

interpreter/src/main/java/com/iluwatar/PlusExpression.java

@@ -9,7 +9,7 @@ public class PlusExpression extends Expression {
 		this.leftExpression = leftExpression;
 		this.rightExpression = rightExpression;
 	}
-	
+
 	@Override
 	public int interpret() {
 		return leftExpression.interpret() + rightExpression.interpret();

iterator/src/main/java/com/iluwatar/App.java

@@ -1,41 +1,41 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * Iterator (ItemIterator) adds abstraction layer on top of a collection
  * (TreasureChest). This way the collection can change its internal
  * implementation without affecting its clients.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        TreasureChest chest = new TreasureChest();
+		TreasureChest chest = new TreasureChest();
 
-        ItemIterator ringIterator = chest.Iterator(ItemType.RING);
+		ItemIterator ringIterator = chest.Iterator(ItemType.RING);
-        while (ringIterator.hasNext()) {
+		while (ringIterator.hasNext()) {
-            System.out.println(ringIterator.next());
+			System.out.println(ringIterator.next());
-        }
+		}
 
-        System.out.println("----------");
+		System.out.println("----------");
 
-        ItemIterator potionIterator = chest.Iterator(ItemType.POTION);
+		ItemIterator potionIterator = chest.Iterator(ItemType.POTION);
-        while (potionIterator.hasNext()) {
+		while (potionIterator.hasNext()) {
-            System.out.println(potionIterator.next());
+			System.out.println(potionIterator.next());
-        }
+		}
 
-        System.out.println("----------");
+		System.out.println("----------");
 
-        ItemIterator weaponIterator = chest.Iterator(ItemType.WEAPON);
+		ItemIterator weaponIterator = chest.Iterator(ItemType.WEAPON);
-        while (weaponIterator.hasNext()) {
+		while (weaponIterator.hasNext()) {
-            System.out.println(weaponIterator.next());
+			System.out.println(weaponIterator.next());
-        }
+		}
 
-        System.out.println("----------");
+		System.out.println("----------");
 
-        ItemIterator it = chest.Iterator(ItemType.ANY);
+		ItemIterator it = chest.Iterator(ItemType.ANY);
-        while (it.hasNext()) {
+		while (it.hasNext()) {
-            System.out.println(it.next());
+			System.out.println(it.next());
-        }
+		}
-    }
+	}
 }

iterator/src/main/java/com/iluwatar/Item.java

@@ -9,7 +9,7 @@ public class Item {
 		this.setType(type);
 		this.name = name;
 	}
-	
+
 	@Override
 	public String toString() {
 		return name;

iterator/src/main/java/com/iluwatar/ItemIterator.java

@@ -3,11 +3,11 @@ package com.iluwatar;
 /**
  * 
  * Iterator interface.
- *
+ * 
  */
 public interface ItemIterator {
 
 	boolean hasNext();
-	
+
 	Item next();
 }

iterator/src/main/java/com/iluwatar/ItemType.java

@@ -2,9 +2,6 @@ package com.iluwatar;
 
 public enum ItemType {
 
-	ANY,
+	ANY, WEAPON, RING, POTION
-	WEAPON,
+
-	RING,
-	POTION
-	
 }

iterator/src/main/java/com/iluwatar/TreasureChest.java

@@ -6,12 +6,12 @@ import java.util.List;
 /**
  * 
  * Collection class.
- *
+ * 
  */
 public class TreasureChest {
 
 	private List<Item> items;
-	
+
 	public TreasureChest() {
 		items = new ArrayList<>();
 		items.add(new Item(ItemType.POTION, "Potion of courage"));
@@ -25,7 +25,7 @@ public class TreasureChest {
 		items.add(new Item(ItemType.WEAPON, "Steel halberd"));
 		items.add(new Item(ItemType.WEAPON, "Dagger of poison"));
 	}
-	
+
 	ItemIterator Iterator(ItemType type) {
 		return new TreasureChestItemIterator(this, type);
 	}
@@ -35,5 +35,5 @@ public class TreasureChest {
 		list.addAll(items);
 		return list;
 	}
-	
+
 }

iterator/src/main/java/com/iluwatar/TreasureChestItemIterator.java

@@ -13,7 +13,7 @@ public class TreasureChestItemIterator implements ItemIterator {
 		this.type = type;
 		this.idx = -1;
 	}
-	
+
 	@Override
 	public boolean hasNext() {
 		return findNextIdx() != -1;
@@ -27,9 +27,9 @@ public class TreasureChestItemIterator implements ItemIterator {
 		}
 		return null;
 	}
-	
+
 	private int findNextIdx() {
-		
+
 		List<Item> items = chest.getItems();
 		boolean found = false;
 		int tempIdx = idx;
@@ -39,7 +39,8 @@ public class TreasureChestItemIterator implements ItemIterator {
 				tempIdx = -1;
 				break;
 			}
-			if (type.equals(ItemType.ANY) || items.get(tempIdx).getType().equals(type)) {
+			if (type.equals(ItemType.ANY)
+					|| items.get(tempIdx).getType().equals(type)) {
 				break;
 			}
 		}

mediator/src/main/java/com/iluwatar/Action.java

@@ -5,7 +5,7 @@ public enum Action {
 	HUNT, TALE, GOLD, ENEMY;
 
 	public String toString() {
-		
+
 		String s = "";
 		switch (this) {
 		case ENEMY:

mediator/src/main/java/com/iluwatar/App.java

@@ -1,28 +1,28 @@
 package com.iluwatar;
 
 /**
- *
+ * 
  * Mediator encapsulates how set of objects (PartyMember) interact. Instead of
  * referring to each other directly they use the mediator (Party) interface.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        Party party = new PartyImpl();
+		Party party = new PartyImpl();
-        Hobbit hobbit = new Hobbit();
+		Hobbit hobbit = new Hobbit();
-        Wizard wizard = new Wizard();
+		Wizard wizard = new Wizard();
-        Rogue rogue = new Rogue();
+		Rogue rogue = new Rogue();
-        Hunter hunter = new Hunter();
+		Hunter hunter = new Hunter();
 
-        party.addMember(hobbit);
+		party.addMember(hobbit);
-        party.addMember(wizard);
+		party.addMember(wizard);
-        party.addMember(rogue);
+		party.addMember(rogue);
-        party.addMember(hunter);
+		party.addMember(hunter);
 
-        hobbit.act(Action.ENEMY);
+		hobbit.act(Action.ENEMY);
-        wizard.act(Action.TALE);
+		wizard.act(Action.TALE);
-        rogue.act(Action.GOLD);
+		rogue.act(Action.GOLD);
-        hunter.act(Action.HUNT);
+		hunter.act(Action.HUNT);
-    }
+	}
 }

mediator/src/main/java/com/iluwatar/Party.java

@@ -3,12 +3,12 @@ package com.iluwatar;
 /**
  * 
  * Mediator interface.
- *
+ * 
  */
 public interface Party {
 
 	void addMember(PartyMember member);
-	
+
 	void act(PartyMember actor, Action action);
-	
+
 }

mediator/src/main/java/com/iluwatar/PartyImpl.java

@@ -6,14 +6,14 @@ import java.util.List;
 public class PartyImpl implements Party {
 
 	private List<PartyMember> members;
-	
+
 	public PartyImpl() {
 		members = new ArrayList<>();
 	}
-	
+
 	@Override
 	public void act(PartyMember actor, Action action) {
-		for (PartyMember member: members) {
+		for (PartyMember member : members) {
 			if (member != actor) {
 				member.partyAction(action);
 			}
@@ -25,13 +25,13 @@ public class PartyImpl implements Party {
 		members.add(member);
 		member.joinedParty(this);
 	}
-	
+
 	// somebody hunts for food, call for dinner
-	
+
 	// somebody spots enemy, alert everybody
-	
+
 	// somebody finds gold, deal the gold with everybody
-	
+
 	// somebody tells a tale, call everybody to listen
-	
+
 }

mediator/src/main/java/com/iluwatar/PartyMember.java

@@ -3,12 +3,12 @@ package com.iluwatar;
 /**
  * 
  * Interface for party members interacting with Party.
- *
+ * 
  */
 public interface PartyMember {
 
 	void joinedParty(Party party);
-	
+
 	void partyAction(Action action);
 
 	void act(Action action);

mediator/src/main/java/com/iluwatar/PartyMemberBase.java

@@ -31,7 +31,7 @@ public abstract class PartyMemberBase implements PartyMember {
 		}
 		System.out.println(s);
 	}
-	
+
 	@Override
 	public void act(Action action) {
 		if (party != null) {
@@ -42,5 +42,5 @@ public abstract class PartyMemberBase implements PartyMember {
 
 	@Override
 	public abstract String toString();
-	
+
 }

memento/src/main/java/com/iluwatar/App.java

@@ -3,34 +3,34 @@ package com.iluwatar;
 import java.util.Stack;
 
 /**
- *
+ * 
  * Memento pattern is for storing and restoring object state. The object (Star)
  * gives out a "memento" (StarMemento) that contains the state of the object.
  * Later on the memento can be set back to the object restoring the state.
- *
+ * 
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        Stack<StarMemento> states = new Stack<>();
+		Stack<StarMemento> states = new Stack<>();
 
-        Star star = new Star(StarType.SUN, 10000000, 500000);
+		Star star = new Star(StarType.SUN, 10000000, 500000);
-        System.out.println(star);
+		System.out.println(star);
-        states.add(star.getMemento());
+		states.add(star.getMemento());
-        star.timePasses();
+		star.timePasses();
-        System.out.println(star);
+		System.out.println(star);
-        states.add(star.getMemento());
+		states.add(star.getMemento());
-        star.timePasses();
+		star.timePasses();
-        System.out.println(star);
+		System.out.println(star);
-        states.add(star.getMemento());
+		states.add(star.getMemento());
-        star.timePasses();
+		star.timePasses();
-        System.out.println(star);
+		System.out.println(star);
-        states.add(star.getMemento());
+		states.add(star.getMemento());
-        star.timePasses();
+		star.timePasses();
-        System.out.println(star);
+		System.out.println(star);
-        while (states.size() > 0) {
+		while (states.size() > 0) {
-            star.setMemento(states.pop());
+			star.setMemento(states.pop());
-            System.out.println(star);
+			System.out.println(star);
-        }
+		}
-    }
+	}
 }

memento/src/main/java/com/iluwatar/Star.java

@@ -3,20 +3,20 @@ package com.iluwatar;
 /**
  * 
  * Star uses "mementos" to store and restore state.
- *
+ * 
  */
 public class Star {
-	
+
 	private StarType type;
 	private int ageYears;
 	private int massTons;
-	
+
 	public Star(StarType startType, int startAge, int startMass) {
 		this.type = startType;
 		this.ageYears = startAge;
 		this.massTons = startMass;
 	}
-	
+
 	public void timePasses() {
 		ageYears *= 2;
 		massTons *= 8;
@@ -41,7 +41,7 @@ public class Star {
 			break;
 		}
 	}
-	
+
 	StarMemento getMemento() {
 
 		StarMementoInternal state = new StarMementoInternal();
@@ -49,20 +49,21 @@ public class Star {
 		state.setMassTons(massTons);
 		state.setType(type);
 		return state;
-		
+
 	}
-	
+
 	void setMemento(StarMemento memento) {
-		
+
 		StarMementoInternal state = (StarMementoInternal) memento;
 		this.type = state.getType();
 		this.ageYears = state.getAgeYears();
 		this.massTons = state.getMassTons();
-		
+
 	}
-	
+
 	@Override
 	public String toString() {
-		return String.format("%s age: %d years mass: %d tons", type.toString(), ageYears, massTons);
+		return String.format("%s age: %d years mass: %d tons", type.toString(),
+				ageYears, massTons);
 	}
 }

memento/src/main/java/com/iluwatar/StarMemento.java

@@ -3,7 +3,7 @@ package com.iluwatar;
 /**
  * 
  * External interface to memento.
- *
+ * 
  */
 public interface StarMemento {
 

memento/src/main/java/com/iluwatar/StarMementoInternal.java

@@ -3,29 +3,34 @@ package com.iluwatar;
 /**
  * 
  * Internal interface to memento.
- *
+ * 
  */
 public class StarMementoInternal implements StarMemento {
 
 	private StarType type;
 	private int ageYears;
 	private int massTons;
-	
+
 	public StarType getType() {
 		return type;
 	}
+
 	public void setType(StarType type) {
 		this.type = type;
 	}
+
 	public int getAgeYears() {
 		return ageYears;
 	}
+
 	public void setAgeYears(int ageYears) {
 		this.ageYears = ageYears;
 	}
+
 	public int getMassTons() {
 		return massTons;
 	}
+
 	public void setMassTons(int massTons) {
 		this.massTons = massTons;
 	}

memento/src/main/java/com/iluwatar/StarType.java

@@ -2,11 +2,7 @@ package com.iluwatar;
 
 public enum StarType {
 
-	SUN,
+	SUN, RED_GIANT, WHITE_DWARF, SUPERNOVA, DEAD;
-	RED_GIANT,
-	WHITE_DWARF,
-	SUPERNOVA,
-	DEAD;
 
 	@Override
 	public String toString() {
@@ -32,5 +28,5 @@ public enum StarType {
 		}
 		return s;
 	}
-	
+
 }