package com.iluwatar;

public enum Armor {

	CLOTHES, LEATHER, CHAIN_MAIL, PLATE_MAIL;

	@Override
	public String toString() {
		return name().toLowerCase().replaceAll("_", " ");
	}

}

package com.iluwatar;

public enum Armor {

	CLOTHES("clothes"), LEATHER("leather"), CHAIN_MAIL("chain mail"), PLATE_MAIL("plate mail");

    private String title;

    Armor(String title) {
        this.title = title;
    }

    @Override
	public String toString() {
		return title;
	}
}

Update Armor enum in builder pattern.