Question

Write a program in Java using MVC (Model, View, Controller) architecture using either HashSet or TreeSet implementation where users can able to getItem, searchItem, removeItem, and addItem to the list.

Answer 1

//ItemController.java controller iterface

package controller.intf;

import model.ItemsDetails;

public interface ItemController {
    public ItemsDetails getItem(String name);
    public ItemsDetails searchItem(String name);
    public boolean removeItem(String name);
    public boolean addItem(String name, double price, String desc);
    public void printDetails();
}

//Model  ItemsDetails.java

package model;

public class ItemsDetails {
    private int id;
    private String name;
    private double price;
    private String desc;

    public ItemsDetails(int id, String name, double price, String desc) {
        this.id = id;
        this.name = name;
        this.price = price;
        this.desc = desc;
    }

    public ItemsDetails(String name) {
        this.name = name;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public double getPrice() {
        return price;
    }

    public void setPrice(double price) {
        this.price = price;
    }

    public String getDesc() {
        return desc;
    }

    public void setDesc(String desc) {
        this.desc = desc;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        ItemsDetails that = (ItemsDetails) o;

        return name != null ? name.equals(that.name) : that.name == null;
    }

    @Override
    public int hashCode() {
        return name != null ? name.hashCode() : 0;
    }

    @Override
    public String toString() {
        return "ItemsDetails{" +
                "id=" + id +
                ", name='" + name + '\'' +
                ", price=" + price +
                ", desc='" + desc + '\'' +
                '}';
    }
}

// Controller ItemControllerImpl.java

package controller;

import controller.intf.ItemController;
import model.ItemsDetails;
import view.ItemView;

import java.util.Scanner;
import java.util.Set;


public class ItemControllerImpl implements ItemController {
    private final ItemView itemView;
    private final Set<ItemsDetails> itemsDetails;
    private int counter;

    public ItemControllerImpl(ItemView itemView, Set<ItemsDetails> itemsDetails) {
        this.itemView = itemView;
        this.itemsDetails = itemsDetails;
        this.counter = itemsDetails.size();
    }

    public ItemsDetails getItem(String name) {
        return searchItem(name);
    }

    public ItemsDetails searchItem(String name) {
        ItemsDetails item = new ItemsDetails(name);
        for (ItemsDetails itemsDetail : itemsDetails) {
            if(itemsDetail.equals(item)){
                return itemsDetail;
            }
        }
        return null;
    }

    public boolean removeItem(String name) {
        ItemsDetails item = new ItemsDetails(name);
        return itemsDetails.remove(item);
    }

    public boolean addItem(String name, double price, String desc) {
        ItemsDetails item = new ItemsDetails(counter++, name, price,desc);
        return itemsDetails.add(item);
    }

    public void printDetails() {
        for (ItemsDetails itemsDetail : itemsDetails) {
            itemView.printItemDetails(itemsDetail.getId(), itemsDetail.getName(), itemsDetail.getPrice(), itemsDetail.getDesc());
        }
    }
}

//View  ItemView.java

package view;

public class ItemView {
   public void printItemDetails(int id, String name, Double price, String desc){
       System.out.println("Item Id :"+id);
       System.out.println("Item Name :"+name);
       System.out.println("Item Price :"+price);
       System.out.println("Item Desc :"+desc);
   }

}

//Demo main class

import controller.ItemControllerImpl;
import controller.intf.ItemController;
import model.ItemsDetails;
import view.ItemView;

import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
import java.util.TreeSet;

public class MVCDemo {
    public static void main(String[] args) {
        ItemView itemView = new ItemView();
        Set<ItemsDetails> itemsDetails = new HashSet<ItemsDetails>();
        ItemController itemController = new ItemControllerImpl(itemView, itemsDetails);

        Scanner scan = new Scanner(System.in);
        while(true){
            System.out.println("================Menu========================");
            System.out.println("To Add new item, Enter 1");
            System.out.println("To Search item, Enter 2");
            System.out.println("To Get an Item, Enter 3");
            System.out.println("To Remove, Enter 4");
            System.out.println("To Print all item, Enter 5");
            System.out.println("To Exit, Enter 9");
            System.out.println("========================================");
            System.out.println();
            System.out.println("Enter your choice::");
            int choice = scan.nextInt();

            switch(choice){
                case 1: System.out.println("Please enter item details");
                    addItem(itemController);
                    break;
                case 2: System.out.println("Searching Item details");
                    ItemsDetails item = itemController.searchItem(getName());
                    if(null!=item){
                        System.out.println("Item found :"+item);
                    }else{
                        System.out.println("Item not found");
                    }
                    break;
                case 3: System.out.println("Fetching item details");
                    item =itemController.getItem(getName());
                    if(null!=item){
                        System.out.println("Item found :"+item);
                    }else{
                        System.out.println("Item not found");
                    }
                    break;
                case 4: System.out.println("Removing item details");
                    boolean flag = itemController.removeItem(getName());
                    if(flag){
                        System.out.println("Item removed successfully");
                    }else{
                        System.out.println("Item not found");
                    }
                    break;
                case 5: System.out.println("Printing item details");
                    itemController.printDetails();
                    break;
                case 9: System.out.println("Thanks you");
                    System.exit(0);
                    break;
                default: System.out.println("Incorrect input!!! Please re-enter your choice from menu");
            }
        }

    }
    private static void addItem(ItemController itemController){
        Scanner sc =new Scanner(System.in);
        System.out.println("Item name:");
        String name = sc.nextLine();
        System.out.println("Item price:");
        double price = sc.nextDouble();
        System.out.println("Item Details:");
        sc.next();
        String desc = sc.nextLine();
        boolean flag =itemController.addItem(name, price, desc);
        if (!flag){
            System.out.println("Item already present");
        }else{
            System.out.println("Item added successfully");
        }
    }
    private static String getName(){
        Scanner sc = new Scanner(System.in);
        System.out.println("Please enter item name");
        return sc.nextLine();
    }

}

// I have create a model ItemDetail which contains item details, An interface for all controller method and a view for ItemView.

MVCExample - Items Details.java - IntelliJ IDEA - 0 X File Edit View Navigate Code Analyze Refactor Build Run Tools VCS Window Help MVCExample src ) main java model Items Details MVCDemo I 1: Project e Ant E Maven 1. Z: Structure Project Items Details.java MVCExample C:\Users\Lenovo\IdeaProjects\MVCE 1 package model; idea 2 src 3 public class ItemsDetails { main 4 private int id; java 5 private String name; controller 6 private double price; intf 7 private String desc; ItemController 8 ItemControllerlmpl 9 public ItemsDetails(int id, String name, double price, String desc) { model 10 this.id = id; c Items Details 11 this.name = name; view 12 this.price = price; Item View 13 this.desc = desc; MVCDemo 14 resources 15 test 16 target public ItemsDetails(String name) { 17 this.name = name; , MVCExample.iml m pom.xml 18 } 11. External Libraries 19 Scratches and Consoles 20 public int getId() { return id; } 23 24 public void setId(int id) { this.id = id; } 27 28 public String getName() { return name; } 31 32 public void setName(String name) { this.name = name; } } * 2: Favorites Event Log E 6: TODO 4: Run 5: Debug Σε Terminal Build O: Messages Build completed successfully with 2 warnings in 1 s 359 ms (5 minutes ago) O Type here to search 1547 chars, 76 line breaks L 15:1 CRLF UTF-8 4 spaces 12:04 ») ENG 01-08-2020

MVCExample - Items Details.java - IntelliJ IDEA - 0 х File Edit View Navigate Code Analyze Refactor Build Run Tools VCS Window Help MVCExample src ) main java model Items Details MVCDemo . Items Details.java X 1: Project Project MVCExample C:\Users\Lenovo IdeaProjects\MVC 14 .idea 15 } e Ant Run: MVCDemo X E Mayen 1. Z: Structure o "C:\Program Files\Java\jdk1.8.0_251\bin\java.exe" ====Menu====== To Add new item, Enter 1 To Search item, Enter 2 To Get an Item, Enter 3 To Remove, Enter 4 To Print all item, Enter 5 To Exit, Enter 9 Enter your choice:: 1 Please enter item details Item name: * 2: Favorites it Item price: 12 Item Details: dasa dfaffa Item added successfully ========Menu======== To Add new item, Enter 1 To Search item, Enter 2 15 6: TODO 4: Run 5: Debug Terminal Build O: Messages Build completed successfully with 2 warnings in 1 s 359 ms (6 minutes ago) O Type here to search Event Log 69:1 CRLF UTF-8 4 spaces 12:04 ») ENG 01-08-2020

MVCExample - Items Details.java - IntelliJ IDEA - 0 X File Edit View Navigate Code Analyze Refactor Build Run Tools VCS Window Help MVCExample src ) main java model Items Details MVCDemo . Items Details.java 1: Project Project MVCExample C:\Users\Lenovo\IdeaProjects\MVCE 14 .idea 15 } e Ant Run: MVCDemo X o - Mayen 1. 7: Structure o dasa dfaffa Item added successfully ====Menu=== To Add new item, Enter 1 To Search item, Enter 2 To Get an Item, Enter 3 To Remove, Enter 4 To Print all item, Enter 5 To Exit, Enter 9 Enter your choice:: 2 Searching Item details Please enter item name it Item found :ItemsDetails{id=0, name='it', price=12.0, desc=' dfaffa'} ======Menu======== To Add new item, Enter 1 To Search item, Enter 2 To Get an Item, Enter 3 To Remove, Enter 4 To Print all item, Enter 5 * 2: Favorites 4: Run Event Log 196: TODO 5: Debug Terminal Build O: Messages Build completed successfully with 2 warnings in 1 s 359 ms (6 minutes ago) O Type here to search 69:1 CRLF UTF-8 4 spaces 2 12:05 ») ENG 01-08-2020

- 0 Х MVCDemo . 1: Project File Edit View Navigate Code Analyze Refactor Build Run Tools VCS Window Help MVCExample - ItemControllerlmpl.java - IntelliJ IDEA MVCExample src) main java controller ItemControllerlmpl Project Items Details.java X ItemControllerImpl.java X intf 30 return itemsDetail; ItemController 31 C ItemControllerImpl 32 } model 33 return null;] Items Details 34 } 6 Ant } E Maven 1. 7: Structure view 35 Run: MVCDemo X 1 32 Item Details: om → If 7 werc dfs Item added successfully ========Menu===== To Add new item, Enter 1 To Search item, Enter 2 To Get an Item, Enter 3 To Remove, Enter 4 To Print all item, Enter 5 To Exit, Enter 9 Enter your choice:: 9 Thanks you * 2: Favorites Process finished with exit code 0 Event Log Build 6: TODO 4: Run 5: Debug Terminal = 0: Messages Build completed successfully with 2 warnings in 1 s 359 ms (10 minutes ago) O Type here to search 33:21 CRLF UTF-8 4 spaces 1 12:08 ») ENG 01-08-2020 חן