Builder Pattern1

package burger;

public class Burger {
    private final String size;
    private final boolean chicken;
    private final boolean mutton;

    private Burger(BurgerBuilder builder) {
        this.size = builder.size;
        this.chicken = builder.chicken;
        this.mutton = builder.mutton;
    }

    // getters for all fields


    public String getSize() {
        return size;
    }

    public boolean isChicken() {
        return chicken;
    }

    public boolean isMutton() {
        return mutton;
    }

    public static class BurgerBuilder {
        private final String size;
        private boolean chicken;
        private boolean mutton;

        public BurgerBuilder(String size) {
            this.size = size;
        }

        public BurgerBuilder chicken(boolean chicken) {
            this.chicken = chicken;
            return this;
        }

        public BurgerBuilder mutton(boolean mutton) {
            this.mutton = mutton;
            return this;
        }

        public Burger build() {
            return new Burger(this);
        }
    }
}