Fluent Builder example

fluent_builder.java

public class Car {
    public static class Builder {
        private int year;
        private String make;
        private String model;
        private String color;

        public Builder year(int year) {
            this.year = year; return this;
        }

        public Builder make(String make) {
            this.make = make; return this;
        }

        public Builder model(String model) {
            this.model = model; return this;
        }

        public Builder color(String color) {
            this.color = color; return this;
        }

        public Car build() {
            return new Car(year, make, model, color);
        }
    }

    private final int year;
    private final String make;
    private final String model;
    private final String color;

    private Car(int year, String make, String model, String color) {
        this.year = year;
        this.make = make;
        this.model = model;
        this.color = color;
    }

    public static Builder builder() {
        return new Builder();
    }
}