Fixes HeroBuilder NullPointerException #35.

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

@@ -1,128 +1,128 @@
-package com.iluwatar;
-
-/**
- * 
- * The class with many parameters.
- * 
- */
-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.BALD ? "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;
-	}
-
-	/**
-	 * 
-	 * The builder class.
-	 * 
-	 */
-	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);
-		}
-	}
-}
+package com.iluwatar;
+
+/**
+ * 
+ * The class with many parameters.
+ * 
+ */
+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.BALD ? "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;
+	}
+
+	/**
+	 * 
+	 * The builder class.
+	 * 
+	 */
+	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 IllegalArgumentException(
+						"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);
+		}
+	}
+}