Car.java

package builder;

import java.util.ArrayList;
import java.util.List;

public class Car {
    private String make;
    private String name;
    private String color;
    private int model;
    private List<String> countriesPresent = new ArrayList<>();

    public void setMake(String make) {
        this.make = make;
    }

    public void setName(String name) {
        this.name = name;
    }

    public void setColor(String color) {
        this.color = color;
    }

    public void setModel(int model) {
        this.model = model;
    }

    public void setCountriesPresent(List<String> countriesPresent) {
        this.countriesPresent = countriesPresent;
    }

    @Override
    public String toString() {
        return String.format(
                "{ make = %s, name = %s, color = %s, model = %s , countriesPresent = %s }",
                make,
                name,
                color,
                model,
                countriesPresent
        );
    }

    public Car(String make, String name, String color, int model, List<String> countriesPresent) {
        this.make = make;
        this.name = name;
        this.color = color;
        this.model = model;
        this.countriesPresent = countriesPresent;
    }

    public Car(){}

    /**
     * Builder code below
     */
    private Car(Builder builder){
        this.make = builder.make;
        this.name = builder.name;
        this.color = builder.color;
        this.model = builder.model;
        this.countriesPresent = builder.countriesPresent;
    }

    public static class Builder {
        private String make;
        private String name;
        private String color;
        private int model;
        private List<String> countriesPresent = new ArrayList<>();

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

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


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


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

        public Builder addCountry(String countriesPresent){
            this.countriesPresent.add(countriesPresent);
            return this;
        }

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

Main.java

package builder;

import java.util.List;

public class Main {
   public static void main(String[] args){
       Car car1 = new Car();
       car1.setMake("Tesla");
       car1.setName("Model X");
       car1.setModel(2020);
       car1.setColor("Blue");
       car1.setCountriesPresent(List.of("USA", "Germany", "China"));

       System.out.println("No args constructor --> "+car1);

       Car car2 = new Car("Toyota", "Fortuner",  "Grey", 2021, List.of("India", "Kenya", "South Africa"));
       System.out.println("All Args Constructor --> "+ car2);

//       Builder execution
       Car car3 = new Car.Builder()
               .make("Ford")
               .name("Mastunga")
               .color("Red")
               .model(2023)
               .addCountry("Kenya")
               .addCountry("Uganda")
               .build();
       System.out.println("Builder 1 --> "+ car3);
   }
}