What are some examples of the builder pattern in programming?

What are some examples of the builder pattern in programming?

The builder pattern is a design pattern that allows for the step-by-step construction of complex objects. Examples include creating a meal order, building a house, or constructing a complex document.

Can you give me a code example of the builder pattern?

Sure! Here's a simple example in Java:

class Pizza {
    private String size;
    private String cheese;
    private String toppings;

    private Pizza(PizzaBuilder builder) {
        this.size = builder.size;
        this.cheese = builder.cheese;
        this.toppings = builder.toppings;
    }

    public static class PizzaBuilder {
        private String size;
        private String cheese;
        private String toppings;

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

        public PizzaBuilder addCheese(String cheese) {
            this.cheese = cheese;
            return this;
        }

        public PizzaBuilder addToppings(String toppings) {
            this.toppings = toppings;
            return this;
        }

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

You can create a pizza like this:

Pizza pizza = new Pizza.PizzaBuilder("Large")
    .addCheese("Mozzarella")
    .addToppings("Pepperoni")
    .build();

What are the benefits of using the builder pattern?

The builder pattern provides several benefits: it allows for more readable code, it separates the construction of a complex object from its representation, and it makes it easier to create immutable objects.