I want to add and delete products from ArrayList

java

package march11;

public interface productlnterface {

public double computeSalePrice();

public double getRegularPrice();

public void setRegularPrice(double regularPrice); public String toString(); }

////////////////////////////////////

package march11;

public abstract class product implements productlnterface {

private double regularPrice;

public product() { }

public product(double regularPrice) { this.regularPrice = regularPrice; }

@Override public double computeSalePrice() { double saleprice;

saleprice = regularPrice + (regularPrice * (10 / 100));

return saleprice; }

@Override public void setRegularPrice(double regularPrice) { this.regularPrice = regularPrice; }

@Override public double getRegularPrice() { return this.regularPrice; } public abstract String toString();

}

////////////////////////////////

package march11;

public class dd extends Book {

private int age;

public dd(double regularPrice, String publisher, int yearPublished) { super(regularPrice, publisher, yearPublished); this.age = age; }

public double computeSalePrice() {

double saleprice;

saleprice = this.getRegularPrice() + (this.getRegularPrice() * (15 / 100));

return saleprice; }

@Override public String toString() { return ".Publisher: " + getPublisher() + "\t Price: " + computeSalePrice()+"\t YearPublished: "+getYearPublished(); } }

////////////////////////////////

package march11;

public class TV extends Electronics {

private int size;

public TV(double regularPrice, String manufacturer, int size) { super(regularPrice, manufacturer); this.size = size; }

public double computeSalePrice() {

double saleprice;

saleprice = this.getRegularPrice() + (this.getRegularPrice() * (50 / 100));

return saleprice; }

@Override public String toString() { return ".Name: "+getManufacturer()+"\t Price: "+computeSalePrice()+"\t Size: "+size; } }

//////////////////////////////////////

package march11;

import java.util.ArrayList; import java.util.Scanner;

import march12.ProductInterface.*;

public class Main {

ArrayList market = new ArrayList();

private int ch = 0; private int p = 0;

public Main() {

menu();

}

public void startScreen() {

System.out.println("Welcome to the market. ................................");

System.out.println("1. Display Store Products");

System.out.println("2. Display Cart");

System.out.println("0. Exit"); }

public void storeProductsMenu() {

System.out.println(" 1. Add to Cart");

System.out.println("2. Remove From Cart");

System.out.println("0. Exit");

}

private int getUserInput() {

Scanner in = new Scanner(System.in);

System.out.print("Your choice:");

ch = Integer.parseInt(in.nextLine()); System.out.println(" "); return ch;

}

public void TrLoop() { if (p == 2) { System.out.println("-----------------------BYE!----------------------- "); System.out.println("$$$$$$$$$$$$Newton passed from here$$$$$$$$$$$$"); System.exit(0); } else { p++; System.out.println("************************ " + "Invalid c1`hoica"); System.out.println("Try again :( " + (p) + " ) " + "************************ "); } }

private void displayStoreProducts() {//????? ???????

product TV1 = new TV(1000, "Samsung", 30); product TV2 = new TV(2000, "Sony", 50);

product MP3Player = new MP3Player(250, "Apple", "blue");

product ChildrenBook = new ChildrenBook(15, "Pee Wee press", 1987, 8);

product Cartoon = new Cartoon(14, "Pee Wee press", 1924, "Batman");

product[] pa = {TV1, TV2, MP3Player, ChildrenBook, Cartoon};

int i = 1; for (product pr : pa) { System.out.println(i + pr.toString()); i++; } }

public void menu() {

do {

startScreen();

getUserInput();

switch (ch) {

case 1:

displayStoreProducts(); storeProductsMenu();

getUserInput();

// innerChoice1(); break;

case 2:

// showCart(); break;

case 0:

System.exit(0);

break;

default: TrLoop(); break;

}

} while (ch != 0); } // ???? ????? ???????? ??????

private void innerChoice1() {

switch (ch) {

case 1:

// addProductToCart(); // showCart(); break;

case 2:

// removeProductFromCart(); break;

default:

break;

}

}

private void addProductToCart() { int pid = getUserInput() - 1; // market.add(1); }

}

////////////////////////////////////

package march11;

public class MP3Player extends Electronics {

String color;

public MP3Player(double regularPrice, String manufacturer, String color) { super(regularPrice, manufacturer); this.color = color; }

public double computeSalePrice() {

double saleprice;

saleprice = this.getRegularPrice() + (this.getRegularPrice() * (40 / 100));

return saleprice; }

public String getColor() { return color; }

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

@Override public String toString() { return ".Name: "+getManufacturer()+"\t Price: "+computeSalePrice()+"\t Color: "+color; } }

////////////////////////////////

package march11;

public interface ElectronicsInterface extends productlnterface {

public String getManufacturer(); }

///////////////

package march11;

public abstract class Electronics extends product implements ElectronicsInterface {

private String manufacturer;

public Electronics(double regularPrice, String manufacturer) {// ??? ?????? ? ????? super(regularPrice); this.manufacturer = manufacturer; }

@Override public String getManufacturer() {//?????? return manufacturer; }

public void setManufacturer(String manufacturer) {// this.manufacturer = manufacturer; }

@Override public abstract String toString();

}

/////////////////////////////////

package march11;

public class ChildrenBook extends Book {

private int age;

public ChildrenBook(double regularPrice, String publisher, int yearPublished, int age) { super(regularPrice, publisher, yearPublished); this.age = age; }

public double computeSalePrice() {

double saleprice;

saleprice = this.getRegularPrice() + (this.getRegularPrice() * (15 / 100));

return saleprice; }

@Override public String toString() { return ".Publisher: " + getPublisher() + "\t Price: " + computeSalePrice()+"\t YearPublished: "+getYearPublished(); } }

//////////////////////////////

package march11;

public class Cartoon extends Book {

private String characterName;

public Cartoon(double regularPrice, String publisher, int yearPublished, String characterName) { super(regularPrice, publisher, yearPublished); this.characterName = characterName; }

public double computeSalePrice() { double saleprice;

saleprice = this.getRegularPrice() + (this.getRegularPrice() * (5 / 100));

return saleprice; }

@Override public String toString() { return ".Publisher: " + getPublisher() + "\t Price: " + computeSalePrice()+"\t YearPublished: "+getYearPublished()+"\t CharacterName: "+characterName; } }

//////////////////////////////

package march11;

public interface BookInterfacee extends productlnterface {//????? ??????

public String getPublisher();

public void setPublisher(String publisher);

public int getYearPublished();

public void setYearPublished(int yearPublished);

}

//////////////////////////////

package march11;

public abstract class Book extends product implements BookInterfacee {

private String publisher; private int yearPublished;

public Book(double regularPrice, String publisher, int yearPublished) { super(regularPrice); this.publisher = publisher; this.yearPublished = yearPublished; }

@Override public String getPublisher() { return publisher; }

@Override public void setPublisher(String publisher) { this.publisher = publisher; }

public int getYearPublished() { return yearPublished; }

public void setYearPublished(int yearPublished) { this.yearPublished = yearPublished; }

public double computeSalePrice() {

double saleprice;

saleprice = this.getRegularPrice() + (this.getRegularPrice() * (20 / 100));

return saleprice; }

@Override public abstract String toString() ;

}

///////////////////////////////////

package march11;

public class Application {

public static void main(String[] args) { new Main(); }

}