Builder Pattern - Car

Car.java

    public class Car {
        private int modelYear;
        private String modelName;
        private String color;
        private String manufacturer;
        private double sellingPrice;
        private String carType;
        private Boolean isLuxury;
        private Boolean isImported;
        private String countryOfManufacture;

        public static class Builder {
            private int modelYear;
            private String modelName;
            private String color;
            private String manufacturer;
            private double sellingPrice;
            private String carType;
            private Boolean isLuxury;
            private Boolean isImported;
            private String countryOfManufacture;

            public Builder modelYear(int modelYear) {
                this.modelYear = modelYear;
                return this;
            }
            public Builder modelName(String modelName) {
                this.modelName = modelName;
                return this;
            }
            public Builder color(String color) {
                this.color = color;
                return this;
            }
            public Builder manufacturer(String manufacturer) {
                this.manufacturer = manufacturer;
                return this;
            }
            public Builder sellingPrice(double sellingPrice) {
                this.sellingPrice = sellingPrice;
                return this;
            }
            public Builder carType(String carType) {
                this.carType = carType;
                return this;
            }
            public Builder isLuxury(Boolean isLuxury) {
                this.isLuxury = isLuxury;
                return this;
            }
            public Builder isImported(Boolean isImported) {
                this.isImported = isImported;
                return this;
            }
            public Builder countryOfManufacture(String countryOfManufacture) {
                this.countryOfManufacture = countryOfManufacture;
                return this;
            }

            public Builder(String modelName, String manufacturer){
                if (modelName == null || manufacturer == null) {
                    throw new NullPointerException("modelName or manufacturer cannot be null");
                }
                this.modelName = modelName;
                this.manufacturer = manufacturer;
            }

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

        }

        private Car(Builder builder) {
            this.modelYear = builder.modelYear;
            this.modelName = builder.modelName;
            this.color = builder.color;
            this.manufacturer = builder.manufacturer;
            this.sellingPrice = builder.sellingPrice;
            this.carType = builder.carType;
            this.isLuxury = builder.isLuxury;
            this.isImported = builder.isImported;
            this.countryOfManufacture = builder.countryOfManufacture;
        }

        public int getModelYear(){
            return modelYear;
        }

        public String getModelName(){
            return modelName;
        }

        public String getColor(){
            return color;
        }

        public String getManufacturer(){
            return manufacturer;
        }

        public double getSellingPrice(){
            return sellingPrice;
        }

        public String getCarType(){
            return carType;
        }

        public Boolean getIsLuxury(){
            return isLuxury;
        }

        public Boolean getIsImported(){
            return isImported;
        }

        public String getCountryOfManufacture(){
            return countryOfManufacture;
        }

    }