enum ItemType {
    Weapon,
    Armor,
    Other
}

class Item {
    // lots of instance variables to set...
    private ItemType type;
    private String name;
    private int value;
    private int weight;
    private int strength;
    private char symbol;

    // the builder pattern uses a nested class called builder
    public static class Builder {
        // these two are required to be specified
        private ItemType type;
        private String name;

        // these are given default values
        private int value = 5;
        private int weight = 10;
        private int strength = 0;
        private char symbol = 'i';

        // the required ones go into the Builder constructor
        public Builder(ItemType type, String name) {
            this.type = type;
            this.name = name;
        }

        // methods for setting each optional property
        public Builder value(int v) {
            value = v;
            return this;
        }
        public Builder weight(int w) {
            weight = w;
            return this;
        }
        public Builder strength(int s) {
            strength = s;
            return this;
        }
        public Builder symbol(char s) {
            symbol = s;
            return this;
        }

        // this method returns the completed Item object
        public Item build() {
            return new Item(this);
        }
    } // end of the nested Builder class

    // the only constructor takes the builder as parameter
    private Item(Builder builder) {
        // copy the things out of the Builder into the Item
        this.type = builder.type;
        this.name = builder.name;
        this.value = builder.value;
        this.weight = builder.weight;
        this.strength = builder.strength;
        this.symbol = builder.symbol; 
    }

    // this is a regular Item method
    @Override
    public String toString() {
        return type.toString() + " " + name + " " + value + " " + weight + " "
            + strength + " " + symbol;
    }

    // more methods would go here...

}


public class BuilderExample {
    public static void main(String args[]) {
        // build some items this way
        Item sword = new Item.Builder(ItemType.Weapon, "Steel Sword")
            .symbol('s')
            .strength(15)
            .build();
            
        Item armor = new Item.Builder(ItemType.Armor, "Iron cuirass")
            .value(12)
            .symbol('a')
            .strength(7)
            .weight(13)
            .build();

        System.out.println(sword);
        System.out.println(armor);
    }
}