builder design pattern

class Burger {
    private String cheese, patty, buns;
    public Burger() {}

    public void setCheese(String cheese) {
        this.cheese = cheese;
    }

    public void setPatty(String patty) {
        this.patty = patty;
    }

    public void setBuns(String buns) {
        this.buns = buns;
    }

    @Override
    public String toString() {
        return "Burger{" +
                "cheese='" + cheese + '\'' +
                ", patty='" + patty + '\'' +
                ", buns='" + buns + '\'' +
                '}';
    }
}

class BurgerBuilder {
    private Burger burger;

    public BurgerBuilder() {
        burger = new Burger();
    }

    public BurgerBuilder addBuns(String bunStyle) {
        burger.setBuns(bunStyle);
        return this;
    }
    public BurgerBuilder addCheese(String cheeseStyle) {
        burger.setCheese(cheeseStyle);
        return this;
    }
    public BurgerBuilder addPatty(String patty) {
        burger.setPatty(patty);
        return this;
    }

    public Burger build() {
        return this.burger;
    }
}

public class Main {

    public static void main(String[] args) {
        var burgerBuilder = new BurgerBuilder();
        var burger = burgerBuilder
                                .addBuns("sesame")
                                .addPatty("fish-patty")
                                .addCheese("chedar")
                                .build();
        System.out.println(burger);
    }
}