【设计模式】JAVA Design Patterns——Builder（构造器模式）

public Hero(Profession profession, String name, HairType hairType, HairColor hairColor, Armor armor, Weapon weapon) {
}

public final 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;
 
  private Hero(Builder 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 Builder {
    private final Profession profession;
    private final String name;
    private HairType hairType;
    private HairColor hairColor;
    private Armor armor;
    private Weapon weapon;
 
    public Builder(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 Builder withHairType(HairType hairType) {
      this.hairType = hairType;
      return this;
    }
 
    public Builder withHairColor(HairColor hairColor) {
      this.hairColor = hairColor;
      return this;
    }
 
    public Builder withArmor(Armor armor) {
      this.armor = armor;
      return this;
    }
 
    public Builder withWeapon(Weapon weapon) {
      this.weapon = weapon;
      return this;
    }
 
    public Hero build() {
      return new Hero(this);
    }
  }

var mage = new Hero.Builder(Profession.MAGE, "Riobard").withHairColor(HairColor.BLACK).withWeapon(Weapon.DAGGER).build();