CarBuilder.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<>();

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

    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;

public class Main {
   public static void main(String[] args){
       Car car = new Car.Builder()
               .make("Ford")
               .name("Mastunga")
               .color("Red")
               .model(2023)
               .addCountry("Kenya")
               .addCountry("Uganda")
               .build();
       System.out.println(car);
   }
}