Formatted all files to the same standard

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

@@ -12,18 +12,18 @@ package com.iluwatar;
  */
 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/KingdomFactory.java

@@ -8,7 +8,9 @@ package com.iluwatar;
 public interface KingdomFactory {
 
 	Castle createCastle();
+
 	King createKing();
+
 	Army createArmy();
 
 }

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

@@ -14,8 +14,8 @@ package com.iluwatar;
  */
 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/GnomeEngineer.java

@@ -2,9 +2,8 @@ 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 {

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

@@ -2,8 +2,7 @@ package com.iluwatar;
 
 /**
  * 
- * GnomeEngineering manager uses Engineer to
+ * GnomeEngineering manager uses Engineer to operate devices.
- * operate devices.
  * 
  */
 public class GnomeEngineeringManager implements Engineer {

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

@@ -9,24 +9,27 @@ package com.iluwatar;
  */
 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/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/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");
 	}
 
 }

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

@@ -17,27 +17,22 @@ import com.iluwatar.Hero.HeroBuilder;
  */
 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

@@ -7,11 +7,19 @@ public enum Armor {
 	@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

@@ -7,12 +7,22 @@ public enum HairColor {
 	@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

@@ -7,12 +7,22 @@ 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

@@ -94,7 +94,8 @@ public class Hero {
 
 		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;

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

@@ -7,11 +7,19 @@ public enum Profession {
 	@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

@@ -7,12 +7,22 @@ public enum Weapon {
 	@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

@@ -10,12 +10,13 @@ package com.iluwatar;
  */
 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/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

@@ -8,18 +8,18 @@ package com.iluwatar;
  */
 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/Size.java

@@ -2,9 +2,7 @@ package com.iluwatar;
 
 public enum Size {
 
-	SMALL,
+	SMALL, NORMAL, LARGE;
-	NORMAL,
-	LARGE;
 
 	@Override
 	public String toString() {
@@ -27,5 +25,4 @@ public enum Size {
 		return s;
 	}
 
-	
 }

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

@@ -26,6 +26,7 @@ public abstract class Target {
 	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

@@ -2,8 +2,7 @@ package com.iluwatar;
 
 public enum Visibility {
 
-	VISIBLE,
+	VISIBLE, INVISIBLE;
-	INVISIBLE;
 
 	@Override
 	public String toString() {

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

@@ -9,17 +9,17 @@ package com.iluwatar;
  */
 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

@@ -26,7 +26,7 @@ public abstract class LetterComposite {
 
 	public void print() {
 		printThisBefore();
-		for (LetterComposite letter: children) {
+		for (LetterComposite letter : children) {
 			letter.print();
 		}
 		printThisAfter();

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

@@ -10,15 +10,20 @@ public class Messenger {
 
 		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);
 
@@ -28,12 +33,18 @@ public class Messenger {
 
 		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

@@ -5,7 +5,7 @@ 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);
 		}
 	}
@@ -20,5 +20,4 @@ public class Sentence extends LetterComposite {
 		System.out.print(".");
 	}
 
-
 }

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

@@ -5,7 +5,7 @@ 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);
 		}
 	}

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

@@ -9,16 +9,16 @@ package com.iluwatar;
  */
 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();
 
 }

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

@@ -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

@@ -5,7 +5,6 @@ import java.util.List;
 import java.util.concurrent.locks.Lock;
 import java.util.concurrent.locks.ReentrantLock;
 
-
 public class Inventory {
 
 	private int inventorySize;
@@ -17,16 +16,16 @@ public class Inventory {
 		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

@@ -7,10 +7,10 @@ package com.iluwatar;
  */
 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

@@ -15,20 +15,20 @@ public class DwarvenGoldmineFacade {
 	}
 
 	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();
 		}

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

@@ -9,20 +9,20 @@ package com.iluwatar;
  */
 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/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

@@ -43,13 +43,13 @@ public class AlchemistShop {
 
 		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

@@ -9,8 +9,8 @@ package com.iluwatar;
  */
 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/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

@@ -10,57 +10,63 @@ import java.util.Stack;
  */
 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/MultiplyExpression.java

@@ -5,7 +5,8 @@ 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;
 	}

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

@@ -9,33 +9,33 @@ package com.iluwatar;
  */
 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/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/TreasureChestItemIterator.java

@@ -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/App.java

@@ -8,21 +8,21 @@ package com.iluwatar;
  */
 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/PartyImpl.java

@@ -13,7 +13,7 @@ public class PartyImpl implements Party {
 
 	@Override
 	public void act(PartyMember actor, Action action) {
-		for (PartyMember member: members) {
+		for (PartyMember member : members) {
 			if (member != actor) {
 				member.partyAction(action);
 			}

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

@@ -11,26 +11,26 @@ import java.util.Stack;
  */
 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

@@ -63,6 +63,7 @@ public class Star {
 
 	@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/StarMementoInternal.java

@@ -14,18 +14,23 @@ public class StarMementoInternal implements StarMemento {
 	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() {

model-view-presenter/src/main/java/com/iluwatar/FileLoader.java

@@ -5,8 +5,8 @@ import java.io.File;
 import java.io.FileReader;
 
 /**
- * Every instance of this class represents the Model component
+ * Every instance of this class represents the Model component in the
- * in the Model-View-Presenter architectural pattern.
+ * Model-View-Presenter architectural pattern.
  * 
  * It is responsible for reading and loading the contents of a given file.
  */
@@ -27,11 +27,12 @@ public class FileLoader {
 	 */
 	public String loadData() {
 		try {
-			BufferedReader br = new BufferedReader(new FileReader(new File(this.fileName)));
+			BufferedReader br = new BufferedReader(new FileReader(new File(
+					this.fileName)));
 			String text = "";
 			String line = "";
 
-			while( (line = br.readLine()) != null ) {
+			while ((line = br.readLine()) != null) {
 				text += line + "\n";
 			}
 
@@ -41,7 +42,7 @@ public class FileLoader {
 			return text;
 		}
 
-		catch(Exception e) {
+		catch (Exception e) {
 			e.printStackTrace();
 		}
 
@@ -51,7 +52,8 @@ public class FileLoader {
 	/**
 	 * Sets the path of the file to be loaded, to the given value.
 	 * 
-	 * @param fileName The path of the file to be loaded.
+	 * @param fileName
+	 *            The path of the file to be loaded.
 	 */
 	public void setFileName(String fileName) {
 		this.fileName = fileName;

model-view-presenter/src/main/java/com/iluwatar/FileSelectorJFrame.java

@@ -14,10 +14,11 @@ import javax.swing.JTextArea;
 import javax.swing.JTextField;
 
 /**
- * This class is the GUI implementation of the View component
+ * This class is the GUI implementation of the View component In the
- * In the Model-View-Presenter pattern.
+ * Model-View-Presenter pattern.
  */
-public class FileSelectorJFrame extends JFrame implements FileSelectorView, ActionListener {
+public class FileSelectorJFrame extends JFrame implements FileSelectorView,
+		ActionListener {
 
 	/**
 	 * Default serial version ID.
@@ -45,8 +46,7 @@ public class FileSelectorJFrame extends JFrame implements FileSelectorView, Acti
 	private JLabel contents;
 
 	/**
-	 * The text field for giving the name of the file
+	 * The text field for giving the name of the file that we want to open.
-	 * that we want to open.
 	 */
 	private JTextField input;
 
@@ -142,13 +142,13 @@ public class FileSelectorJFrame extends JFrame implements FileSelectorView, Acti
 
 	@Override
 	public void actionPerformed(ActionEvent e) {
-		if(e.getSource() == this.OK) {
+		if (e.getSource() == this.OK) {
 			this.fileName = this.input.getText();
 			presenter.fileNameChanged();
 			presenter.confirmed();
 		}
 
-		else if(e.getSource() == this.cancel) {
+		else if (e.getSource() == this.cancel) {
 			presenter.cancelled();
 		}
 	}

model-view-presenter/src/main/java/com/iluwatar/FileSelectorPresenter.java

@@ -1,10 +1,11 @@
 package com.iluwatar;
 
 /**
- * Every instance of this class represents the Presenter component
+ * Every instance of this class represents the Presenter component in the
- * in the Model-View-Presenter architectural pattern.
+ * Model-View-Presenter architectural pattern.
  * 
- * It is responsible for reacting to the user's actions and update the View component.
+ * It is responsible for reacting to the user's actions and update the View
+ * component.
  */
 public class FileSelectorPresenter {
 
@@ -21,7 +22,8 @@ public class FileSelectorPresenter {
 	/**
 	 * Constructor
 	 * 
-	 * @param view The view component that the presenter will interact with.
+	 * @param view
+	 *            The view component that the presenter will interact with.
 	 */
 	public FileSelectorPresenter(FileSelectorView view) {
 		this.view = view;
@@ -30,7 +32,8 @@ public class FileSelectorPresenter {
 	/**
 	 * Sets the FileLoader object, to the value given as parameter.
 	 * 
-	 * @param loader The new FileLoader object(the Model component).
+	 * @param loader
+	 *            The new FileLoader object(the Model component).
 	 */
 	public void setLoader(FileLoader loader) {
 		this.loader = loader;
@@ -52,12 +55,12 @@ public class FileSelectorPresenter {
 	}
 
 	public void confirmed() {
-		if(loader.getFileName() == null || loader.getFileName().equals("")) {
+		if (loader.getFileName() == null || loader.getFileName().equals("")) {
 			view.showMessage("Please give the name of the file first!");
 			return;
 		}
 
-		if(loader.fileExists()) {
+		if (loader.fileExists()) {
 			String data = loader.loadData();
 			view.displayData(data);
 		}

model-view-presenter/src/main/java/com/iluwatar/FileSelectorStub.java

@@ -1,14 +1,14 @@
 package com.iluwatar;
 
 /**
- * Every instance of this class represents the Stub component in
+ * Every instance of this class represents the Stub component in the
- * the Model-View-Presenter architectural pattern.
+ * Model-View-Presenter architectural pattern.
  * 
- * The stub implements the View interface and it is useful when
+ * The stub implements the View interface and it is useful when we want the test
- * we want the test the reaction to user events, such as mouse clicks.
+ * the reaction to user events, such as mouse clicks.
  * 
- * Since we can not test the GUI directly, the MVP pattern provides
+ * Since we can not test the GUI directly, the MVP pattern provides this
- * this functionality through the View's dummy implementation, the Stub.
+ * functionality through the View's dummy implementation, the Stub.
  */
 public class FileSelectorStub implements FileSelectorView {
 

model-view-presenter/src/main/java/com/iluwatar/FileSelectorView.java

@@ -1,9 +1,8 @@
 package com.iluwatar;
 
 /**
- * This interface represents the View component in the 
+ * This interface represents the View component in the Model-View-Presenter
- * Model-View-Presenter pattern. It can be implemented 
+ * pattern. It can be implemented by either the GUI components, or by the Stub.
- * by either the GUI components, or by the Stub.
  */
 public interface FileSelectorView {
 
@@ -25,7 +24,8 @@ public interface FileSelectorView {
 	/**
 	 * Sets the presenter component, to the one given as parameter.
 	 * 
-	 * @param presenter The new presenter component.
+	 * @param presenter
+	 *            The new presenter component.
 	 */
 	public void setPresenter(FileSelectorPresenter presenter);
 
@@ -37,7 +37,8 @@ public interface FileSelectorView {
 	/**
 	 * Sets the file's name, to the value given as parameter.
 	 * 
-	 * @param name The new name of the file.
+	 * @param name
+	 *            The new name of the file.
 	 */
 	public void setFileName(String name);
 
@@ -49,14 +50,16 @@ public interface FileSelectorView {
 	/**
 	 * Displays a message to the users.
 	 * 
-	 * @param message The message to be displayed.
+	 * @param message
+	 *            The message to be displayed.
 	 */
 	public void showMessage(String message);
 
 	/**
 	 * Displays the data to the view.
 	 * 
-	 * @param data The data to be written.
+	 * @param data
+	 *            The data to be written.
 	 */
 	public void displayData(String data);
 }

model-view-presenter/src/test/java/com/iluwatar/FileSelectorPresenterTest.java

@@ -6,8 +6,8 @@ import org.junit.Before;
 import org.junit.Test;
 
 /**
- * This test case is responsible for testing our application
+ * This test case is responsible for testing our application by taking advantage
- * by taking advantage of the Model-View-Controller architectural pattern.
+ * of the Model-View-Controller architectural pattern.
  */
 public class FileSelectorPresenterTest {
 
@@ -26,7 +26,6 @@ public class FileSelectorPresenterTest {
 	 */
 	private FileLoader loader;
 
-	
 	/**
 	 * Initializes the components of the test case.
 	 */
@@ -64,8 +63,8 @@ public class FileSelectorPresenterTest {
 	}
 
 	/**
-	 * Tests if we receive a confirmation when we attempt to open a file
+	 * Tests if we receive a confirmation when we attempt to open a file that
-	 * that it's name is null or an empty string.
+	 * it's name is null or an empty string.
 	 */
 	@Test
 	public void fileConfirmationWhenNameIsNull() {
@@ -80,8 +79,8 @@ public class FileSelectorPresenterTest {
 	}
 
 	/**
-	 * Tests if we receive a confirmation when we attempt to open a file
+	 * Tests if we receive a confirmation when we attempt to open a file that it
-	 * that it doesn't exist.
+	 * doesn't exist.
 	 */
 	@Test
 	public void fileConfirmationWhenFileDoesNotExist() {

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

@@ -8,16 +8,16 @@ package com.iluwatar;
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
 
-        Weather weather = new Weather();
+		Weather weather = new Weather();
-        weather.addObserver(new Orcs());
+		weather.addObserver(new Orcs());
-        weather.addObserver(new Hobbits());
+		weather.addObserver(new Hobbits());
 
-        weather.timePasses();
+		weather.timePasses();
-        weather.timePasses();
+		weather.timePasses();
-        weather.timePasses();
+		weather.timePasses();
-        weather.timePasses();
+		weather.timePasses();
 
-    }
+	}
 }

observer/src/main/java/com/iluwatar/Hobbits.java

@@ -6,7 +6,8 @@ public class Hobbits implements WeatherObserver {
 	public void update(WeatherType currentWeather) {
 		switch (currentWeather) {
 		case COLD:
-			System.out.println("The hobbits are shivering in the cold weather.");
+			System.out
+					.println("The hobbits are shivering in the cold weather.");
 			break;
 		case RAINY:
 			System.out.println("The hobbits look for cover from the rain.");
@@ -15,7 +16,8 @@ public class Hobbits implements WeatherObserver {
 			System.out.println("The happy hobbits bade in the warm sun.");
 			break;
 		case WINDY:
-			System.out.println("The hobbits hold their hats tightly in the windy weather.");
+			System.out
+					.println("The hobbits hold their hats tightly in the windy weather.");
 			break;
 		default:
 			break;

observer/src/main/java/com/iluwatar/Weather.java

@@ -5,8 +5,8 @@ import java.util.List;
 
 /**
  * 
- * Weather can be observed by implementing WeatherObserver
+ * Weather can be observed by implementing WeatherObserver interface and
- * interface and registering as listener.
+ * registering as listener.
  * 
  */
 public class Weather {
@@ -49,7 +49,7 @@ public class Weather {
 	}
 
 	private void notifyObservers() {
-		for (WeatherObserver obs: observers) {
+		for (WeatherObserver obs : observers) {
 			obs.update(currentWeather);
 		}
 	}

observer/src/main/java/com/iluwatar/WeatherType.java

@@ -2,10 +2,7 @@ package com.iluwatar;
 
 public enum WeatherType {
 
-	SUNNY,
+	SUNNY, RAINY, WINDY, COLD;
-	RAINY,
-	WINDY,
-	COLD;
 
 	public String toString() {
 		return this.name().toLowerCase();

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

@@ -9,26 +9,28 @@ package com.iluwatar;
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        HeroFactory factory;
+		HeroFactory factory;
-        Mage mage;
+		Mage mage;
-        Warlord warlord;
+		Warlord warlord;
-        Beast beast;
+		Beast beast;
 
-        factory = new HeroFactoryImpl(new ElfMage(), new ElfWarlord(), new ElfBeast());
+		factory = new HeroFactoryImpl(new ElfMage(), new ElfWarlord(),
-        mage = factory.createMage();
+				new ElfBeast());
-        warlord = factory.createWarlord();
+		mage = factory.createMage();
-        beast = factory.createBeast();
+		warlord = factory.createWarlord();
-        System.out.println(mage);
+		beast = factory.createBeast();
-        System.out.println(warlord);
+		System.out.println(mage);
-        System.out.println(beast);
+		System.out.println(warlord);
+		System.out.println(beast);
 
-        factory = new HeroFactoryImpl(new OrcMage(), new OrcWarlord(), new OrcBeast());
+		factory = new HeroFactoryImpl(new OrcMage(), new OrcWarlord(),
-        mage = factory.createMage();
+				new OrcBeast());
-        warlord = factory.createWarlord();
+		mage = factory.createMage();
-        beast = factory.createBeast();
+		warlord = factory.createWarlord();
-        System.out.println(mage);
+		beast = factory.createBeast();
-        System.out.println(warlord);
+		System.out.println(mage);
-        System.out.println(beast);
+		System.out.println(warlord);
-    }
+		System.out.println(beast);
+	}
 }

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

@@ -7,14 +7,14 @@ package com.iluwatar;
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
 
-        WizardTowerProxy tower = new WizardTowerProxy();
+		WizardTowerProxy tower = new WizardTowerProxy();
-        tower.enter(new Wizard("Red wizard"));
+		tower.enter(new Wizard("Red wizard"));
-        tower.enter(new Wizard("White wizard"));
+		tower.enter(new Wizard("White wizard"));
-        tower.enter(new Wizard("Black wizard"));
+		tower.enter(new Wizard("Black wizard"));
-        tower.enter(new Wizard("Green wizard"));
+		tower.enter(new Wizard("Green wizard"));
-        tower.enter(new Wizard("Brown wizard"));
+		tower.enter(new Wizard("Brown wizard"));
 
-    }
+	}
 }

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

@@ -8,12 +8,12 @@ package com.iluwatar;
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
 
-        IvoryTower ivoryTower1 = IvoryTower.getInstance();
+		IvoryTower ivoryTower1 = IvoryTower.getInstance();
-        IvoryTower ivoryTower2 = IvoryTower.getInstance();
+		IvoryTower ivoryTower2 = IvoryTower.getInstance();
-        System.out.println("ivoryTower1=" + ivoryTower1);
+		System.out.println("ivoryTower1=" + ivoryTower1);
-        System.out.println("ivoryTower2=" + ivoryTower2);
+		System.out.println("ivoryTower2=" + ivoryTower2);
 
-    }
+	}
 }

singleton/src/main/java/com/iluwatar/IvoryTower.java

@@ -9,7 +9,8 @@ public class IvoryTower {
 
 	private static IvoryTower instance = new IvoryTower();
 
-	private IvoryTower() {}
+	private IvoryTower() {
+	}
 
 	public static IvoryTower getInstance() {
 		return instance;

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

@@ -9,14 +9,14 @@ package com.iluwatar;
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
 
-        Mammoth mammoth = new Mammoth();
+		Mammoth mammoth = new Mammoth();
-        mammoth.observe();
+		mammoth.observe();
-        mammoth.timePasses();
+		mammoth.timePasses();
-        mammoth.observe();
+		mammoth.observe();
-        mammoth.timePasses();
+		mammoth.timePasses();
-        mammoth.observe();
+		mammoth.observe();
 
-    }
+	}
 }

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

@@ -8,15 +8,15 @@ package com.iluwatar;
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        System.out.println("Green dragon spotted ahead!");
+		System.out.println("Green dragon spotted ahead!");
-        DragonSlayer dragonSlayer = new DragonSlayer(new MeleeStrategy());
+		DragonSlayer dragonSlayer = new DragonSlayer(new MeleeStrategy());
-        dragonSlayer.goToBattle();
+		dragonSlayer.goToBattle();
-        System.out.println("Red dragon emerges.");
+		System.out.println("Red dragon emerges.");
-        dragonSlayer.changeStrategy(new ProjectileStrategy());
+		dragonSlayer.changeStrategy(new ProjectileStrategy());
-        dragonSlayer.goToBattle();
+		dragonSlayer.goToBattle();
-        System.out.println("Black dragon lands before you.");
+		System.out.println("Black dragon lands before you.");
-        dragonSlayer.changeStrategy(new SpellStrategy());
+		dragonSlayer.changeStrategy(new SpellStrategy());
-        dragonSlayer.goToBattle();
+		dragonSlayer.goToBattle();
-    }
+	}
 }

strategy/src/main/java/com/iluwatar/ProjectileStrategy.java

@@ -4,7 +4,8 @@ public class ProjectileStrategy implements DragonSlayingStrategy {
 
 	@Override
 	public void execute() {
-		System.out.println("You shoot the dragon with the magical crossbow and it falls dead on the ground!");
+		System.out
+				.println("You shoot the dragon with the magical crossbow and it falls dead on the ground!");
 	}
 
 }

strategy/src/main/java/com/iluwatar/SpellStrategy.java

@@ -4,7 +4,8 @@ public class SpellStrategy implements DragonSlayingStrategy {
 
 	@Override
 	public void execute() {
-		System.out.println("You cast the spell of disintegration and the dragon vaporizes in a pile of dust!");
+		System.out
+				.println("You cast the spell of disintegration and the dragon vaporizes in a pile of dust!");
 	}
 
 }

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

@@ -8,10 +8,10 @@ package com.iluwatar;
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
-        HalflingThief thief = new HalflingThief(new HitAndRunMethod());
+		HalflingThief thief = new HalflingThief(new HitAndRunMethod());
-        thief.steal();
+		thief.steal();
-        thief.changeMethod(new SubtleMethod());
+		thief.changeMethod(new SubtleMethod());
-        thief.steal();
+		thief.steal();
-    }
+	}
 }

template-method/src/main/java/com/iluwatar/SubtleMethod.java

@@ -9,12 +9,14 @@ public class SubtleMethod extends StealingMethod {
 
 	@Override
 	protected void confuseTarget(String target) {
-		System.out.println("Approach the " + target + " with tears running and hug him!");
+		System.out.println("Approach the " + target
+				+ " with tears running and hug him!");
 	}
 
 	@Override
 	protected void stealTheItem(String target) {
-		System.out.println("While in close contact grab the " + target + "'s wallet.");
+		System.out.println("While in close contact grab the " + target
+				+ "'s wallet.");
 	}
 
 }

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

@@ -9,14 +9,14 @@ package com.iluwatar;
  */
 public class App {
 
-    public static void main(String[] args) {
+	public static void main(String[] args) {
 
-        Commander commander = new Commander(
+		Commander commander = new Commander(new Sergeant(new Soldier(),
-                new Sergeant(new Soldier(), new Soldier(), new Soldier()),
+				new Soldier(), new Soldier()), new Sergeant(new Soldier(),
-                new Sergeant(new Soldier(), new Soldier(), new Soldier()));
+				new Soldier(), new Soldier()));
-        commander.accept(new SoldierVisitor());
+		commander.accept(new SoldierVisitor());
-        commander.accept(new SergeantVisitor());
+		commander.accept(new SergeantVisitor());
-        commander.accept(new CommanderVisitor());
+		commander.accept(new CommanderVisitor());
 
-    }
+	}
 }

visitor/src/main/java/com/iluwatar/Commander.java

@@ -2,7 +2,7 @@ package com.iluwatar;
 
 public class Commander extends Unit {
 
-	public Commander(Unit ... children) {
+	public Commander(Unit... children) {
 		super(children);
 	}
 

visitor/src/main/java/com/iluwatar/Sergeant.java

@@ -2,7 +2,7 @@ package com.iluwatar;
 
 public class Sergeant extends Unit {
 
-	public Sergeant(Unit ... children) {
+	public Sergeant(Unit... children) {
 		super(children);
 	}
 

visitor/src/main/java/com/iluwatar/Soldier.java

@@ -2,7 +2,7 @@ package com.iluwatar;
 
 public class Soldier extends Unit {
 
-	public Soldier(Unit ... children) {
+	public Soldier(Unit... children) {
 		super(children);
 	}
 

visitor/src/main/java/com/iluwatar/Unit.java

@@ -9,12 +9,12 @@ public abstract class Unit {
 
 	private Unit[] children;
 
-	public Unit(Unit ... children) {
+	public Unit(Unit... children) {
 		this.children = children;
 	}
 
 	public void accept(UnitVisitor visitor) {
-		for (Unit child: children) {
+		for (Unit child : children) {
 			child.accept(visitor);
 		}
 	}

visitor/src/main/java/com/iluwatar/UnitVisitor.java

@@ -8,7 +8,9 @@ package com.iluwatar;
 public interface UnitVisitor {
 
 	void visitSoldier(Soldier soldier);
+
 	void visitSergeant(Sergeant sergeant);
+
 	void visitCommander(Commander commander);
 
 }