Design Pattern Facade JAVA

Facade Pattern digunakan ketika segmen dari client membutuhkan interface yang sederhana untuk menjalankan semua fungsi dari subsistem yang kompleks.

// SportCarShop.java
import java.io.IOException;

public interface SportCarShop {
    void model() throws NumberFormatException, IOException;
    void productionYear() throws NumberFormatException, IOException;
    void price() throws NumberFormatException, IOException;
}

// Lamborghini.java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Lamborghini implements SportCarShop {
    BufferedReader select = new BufferedReader(new InputStreamReader(System.in));
    private static int choose;

    @Override
    public void model() throws NumberFormatException, IOException {
        System.out.println("\nChoose model do you want :");
        System.out.print("1. Lamborghini Urus"
                + "\n2. Lamborghini Centenario"
                + "\n3. Lamborghini Aventador S Roadster"
                + "\nChoose one : ");
        choose = Integer.parseInt(select.readLine());

        switch(choose) {
        case 1 :
            {
                System.out.print("You choose Lamborghini Urus");
            }
            break;

        case 2 :
            {
                System.out.print("You choose Lamborghini Centenario");
            }
            break;

        case 3 :
            {
                System.out.print("You choose Lamborghini Aventador S Roadster");
            }
            break;

            default :
            {
                System.out.print("\nSorry, this item is not found.");
            }

            return;
        }
    }

    @Override
    public void productionYear() throws NumberFormatException, IOException {
        System.out.println("\n\nChoose production year do you want : ");
        System.out.print("1. 2015"
                + "\n2. 2016"
                + "\n3. 2017"
                + "\n4. 2018"
                + "\n5. 2019"
                + "\nChoose one : ");
        choose = Integer.parseInt(select.readLine());

        switch(choose) {
        case 1 :
            {
                System.out.print("You choose 2015");
            }
            break;

        case 2 :
            {
                System.out.print("You choose 2016");
            }
            break;

        case 3 :
            {
                System.out.print("You choose 2017");
            }
            break;

        case 4 :
            {
                System.out.print("You choose 2018");
            }
            break;

        case 5 :
            {
                System.out.print("You choose 2019");
            }
            break;

        default :
            {
                System.out.print("\nSorry, production year is not found.");
            }

            return;
        }
    }

    @Override
    public void price() throws NumberFormatException, IOException {
        System.out.print("\n\nWhat number the type of car you want to buy : ");
        choose = Integer.parseInt(select.readLine());

        switch(choose) {
        case 1 :
            {
                System.out.print("Rp3.000.000.000\n\n");
            }
            break;

        case 2 :
            {
                System.out.print("Rp25.000.000.000\n\n");
            }
            break;

        case 3 :
            {
                System.out.print("Rp5.000.000.000\n\n");
            }
            break;

        default :
            {
                System.out.print("\nSorry, this item is not found.\n\n");
            }

            return;
        }
    }
}

// MercedesBenz.java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class MercedesBenz implements SportCarShop {
    BufferedReader select = new BufferedReader(new InputStreamReader(System.in));
    private static int choose;

    @Override
    public void model() throws NumberFormatException, IOException {
        System.out.println("\nChoose model do you want :");
        System.out.print("1. Mercedes Benz SL 63 AMG"
                + "\n2. Mercedes Benz AMG GT R"
                + "\n3. Mercedes Benz Maybech S 560"
                + "\nChoose one : ");
        choose = Integer.parseInt(select.readLine());

        switch(choose) {
        case 1 :
            {
                System.out.print("You choose Mercedes Benz SL 63 AMG");
            }
            break;

        case 2 :
            {
                System.out.print("You choose Mercedes Benz AMG GT R");
            }
            break;

        case 3 :
            {
                System.out.print("You choose Mercedes Benz Maybech S 560");
            }
            break;

            default :
            {
                System.out.print("\nSorry, this item is not found.");
            }

            return;
        }
    }

    @Override
    public void productionYear() throws NumberFormatException, IOException {
        System.out.println("\n\nChoose production year do you want : ");
        System.out.print("1. 2015"
                + "\n2. 2016"
                + "\n3. 2017"
                + "\n4. 2018"
                + "\n5. 2019"
                + "\nChoose one : ");
        choose = Integer.parseInt(select.readLine());

        switch(choose) {
        case 1 :
            {
                System.out.print("You choose 2015");
            }
            break;

        case 2 :
            {
                System.out.print("You choose 2016");
            }
            break;

        case 3 :
            {
                System.out.print("You choose 2017");
            }
            break;

        case 4 :
            {
                System.out.print("You choose 2018");
            }
            break;

        case 5 :
            {
                System.out.print("You choose 2019");
            }
            break;

        default :
            {
                System.out.print("\nSorry, production year is not found.");
            }

            return;
        }
    }

    @Override
    public void price() throws NumberFormatException, IOException {
        System.out.print("\n\nWhat the type of car you want to buy : ");
        choose = Integer.parseInt(select.readLine());

        switch(choose) {
        case 1 :
            {
                System.out.print("Rp3.400.000.000\n\n");
            }
            break;

        case 2 :
            {
                System.out.print("Rp5.560.000.000\n\n");
            }
            break;

        case 3 :
            {
                System.out.print("Rp7.380.000.000\n\n");
            }
            break;

        default :
            {
                System.out.print("\nSorry, this item is not found.\n\n");
            }

            return;
        }
    }
}

// Pay.java
import java.io.IOException;

public class Pay {
    private SportCarShop Lamborghini;
    private SportCarShop MercedesBenz;

    public Pay() {
        Lamborghini = new Lamborghini();
        MercedesBenz = new MercedesBenz();
    }

    public void LamborghiniSale() throws NumberFormatException, IOException {
        Lamborghini.model();
        Lamborghini.productionYear();
        Lamborghini.price();
    }

    public void MercedesBenzSale() throws NumberFormatException, IOException {
        MercedesBenz.model();
        MercedesBenz.productionYear();
        MercedesBenz.price();
    }
}

// Progress.java
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Progress {
    private static int choice;
    public static void main(String[] args) throws NumberFormatException, IOException {
        do {
            System.out.println("\t\tWELCOME TO SPORT CAR SHOP");
            System.out.print("\n1. Lamborghini"
                    + "\n2. Mercedes Benz"
                    + "\nEnter Your Choice : ");

            BufferedReader selection = new BufferedReader(new InputStreamReader(System.in));
            choice = Integer.parseInt(selection.readLine());
            Pay car = new Pay();

            switch(choice) {
            case 1 :
                {
                    car.LamborghiniSale();
                }
                break;

            case 2 :
                {
                    car.MercedesBenzSale();
                }

                break;

            default :
                {
                    System.out.println("Nothing you purchased");
                }

                return;
            }
        }

        while(choice != 4);
    }
}