An example of the Builder Pattern in Java for a simple car class.

Car-Builder.java

public class Car {
    int year;
    String make;
    String model;
    String carType;

    public static class Builder {
        int year;
        String make;
        String model;
        String carType;

        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 carType(String carType) {
            this.carType = carType;
            return this;
        }

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

    private Car(Builder builder) {
        this.year = builder.year;
        this.make = builder.make;
        this.model = builder.model;
        this.carType = builder.carType;
    }
}