added builder sample

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

@@ -0,0 +1,31 @@
+package com.iluwatar;
+
+import com.iluwatar.Hero.HeroBuilder;
+
+public class App 
+{
+    public static void main( String[] args )
+    {
+    	
+    	Hero mage = new HeroBuilder(Profession.MAGE, "Riobard")
+    		.withHairColor(HairColor.BLACK)
+    		.withWeapon(Weapon.DAGGER)
+    		.build();
+    	System.out.println(mage);
+
+		Hero warrior = new HeroBuilder(Profession.WARRIOR, "Amberjill")
+			.withHairColor(HairColor.BLOND)
+			.withHairType(HairType.LONG_CURLY)
+			.withArmor(Armor.CHAIN_MAIL)
+			.withWeapon(Weapon.SWORD)
+			.build();
+		System.out.println(warrior);
+
+		Hero thief = new HeroBuilder(Profession.THIEF, "Desmond")
+			.withHairType(HairType.BOLD)
+			.withWeapon(Weapon.BOW)
+			.build();
+		System.out.println(thief);
+	
+    }
+}

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

@@ -0,0 +1,19 @@
+package com.iluwatar;
+
+public enum Armor {
+
+	CLOTHES, LEATHER, CHAIN_MAIL, PLATE_MAIL;
+	
+	@Override
+	public String toString() {
+		String s = "";
+		switch(this) {
+		case CLOTHES: s = "clothes"; 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

@@ -0,0 +1,20 @@
+package com.iluwatar;
+
+public enum HairColor {
+
+	WHITE, BLOND, RED, BROWN, BLACK;
+	
+	@Override
+	public String toString() {
+		String s = "";
+		switch(this) {
+		case WHITE: s = "white"; break;
+		case BLOND: 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

@@ -0,0 +1,20 @@
+package com.iluwatar;
+
+public enum HairType {
+
+	BOLD, SHORT, CURLY, LONG_STRAIGHT, LONG_CURLY;
+
+	@Override
+	public String toString() {
+		String s = "";
+		switch(this) {
+		case BOLD: s = "bold"; break;
+		case SHORT: 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

@@ -0,0 +1,119 @@
+package com.iluwatar;
+
+public class Hero {
+
+	private final Profession profession;
+	private final String name;
+	private final HairType hairType;
+	private final HairColor hairColor;
+	private final Armor armor;
+	private final Weapon weapon;
+	
+	public Profession getProfession() {
+		return profession;
+	}
+
+	public String getName() {
+		return name;
+	}
+
+	public HairType getHairType() {
+		return hairType;
+	}
+
+	public HairColor getHairColor() {
+		return hairColor;
+	}
+
+	public Armor getArmor() {
+		return armor;
+	}
+
+	public Weapon getWeapon() {
+		return weapon;
+	}
+	
+	@Override
+	public String toString() {
+
+		StringBuilder sb = new StringBuilder();
+		sb.append(profession);
+		sb.append(" named ");
+		sb.append(name);
+		if (hairColor != null || hairType != null) {
+			sb.append(" with ");
+			if (hairColor != null) {
+				sb.append(hairColor);
+				sb.append(" ");
+			}
+			if (hairType != null) {
+				sb.append(hairType);
+				sb.append(" ");
+			}
+			sb.append(hairType != HairType.BOLD ? "hair" : "head");
+		}
+		if (armor != null) {
+			sb.append(" wearing ");
+			sb.append(armor);
+		}
+		if (weapon != null) {
+			sb.append(" and wielding ");
+			sb.append(weapon);
+		}
+		sb.append(".");
+		return sb.toString();
+	}
+
+	private Hero(HeroBuilder builder) {
+		this.profession = builder.profession;
+		this.name = builder.name;
+		this.hairColor = builder.hairColor;
+		this.hairType = builder.hairType;
+		this.weapon = builder.weapon;
+		this.armor = builder.armor;
+	}
+	
+	public static class HeroBuilder {
+
+		private final Profession profession;
+		private final String name;
+		private HairType hairType;
+		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");
+			}
+			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;
+		}
+
+		public HeroBuilder withArmor(Armor armor) {
+			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

@@ -0,0 +1,19 @@
+package com.iluwatar;
+
+public enum Profession {
+	
+	WARRIOR, THIEF, MAGE, PRIEST;
+
+	@Override
+	public String toString() {
+		String s = "";
+		switch(this) {
+		case WARRIOR: s = "Warrior"; 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

@@ -0,0 +1,20 @@
+package com.iluwatar;
+
+public enum Weapon {
+
+	DAGGER, SWORD, AXE, WARHAMMER, BOW;
+	
+	@Override
+	public String toString() {
+		String s = "";
+		switch(this) {
+		case DAGGER: s = "dagger"; break;
+		case SWORD: s = "sword"; break;
+		case AXE: s = "axe"; break;
+		case WARHAMMER: s = "warhammer"; break;
+		case BOW: s = "bow"; break;
+		}
+		return s;
+	}
+	
+}