Question

In JAVA

While out on a standard run we stop in at our ‘local’ fence and try to sell some of our items. When we board his ship we notice that we are the only people on board, so we instantly start grabbing things and loading them on our ship and get ready to run. While grabbing things we realize that we are going to run out of space extremely quickly and we should prioritize what we grab to maximize our financial gain while staying under our weight limit.

We don’t have time to figure this out now as Gweedar might come back at any moment and catch us stealing from him – which would result in our instant death.

Create a RECURSIVE algorithm that maximizes the amount of money we will get if we ever come across this situation again. We will call this method ‘ransack’ and it should accept a large list of items and return the optimal list of items we should grab based on our weight limit.

We must store our items in a file and read from the file if prompted by the user. You can create a file with the list of items so you never have to type them in again, and you can control the items that are introduced to our world.

Items have attributes such as Name, Weight, Value, Durability and ID. (Create an object called ‘Item’)

We now classify our items by separating them into 3 distinct categories Equipable, Consumable or Weapon. (You must implement these 3 classes that are subclasses of Item and they must have at least 3 unique attributes in each subclass)

We can carry an unlimited number of items, as long as they don’t exceed the maximum weight of the cargo bay, 25 Tons. (Use an ArrayList that checks an item’s weight before placing it in the cargo hold)

The following methods still have the same requirements from the assignment previous to this one: Add, Remove, Search, Sort, Filter, and Display.

Note: With your submission of this assignment you must include all of your files AND your file that you created to load into your program.

Answer 1

ItemsListProject.java

//Import required packages

import java.io.BufferedReader;

import java.io.BufferedWriter;

import java.io.File;

import java.io.FileOutputStream;

import java.io.FileReader;

import java.io.IOException;

import java.io.OutputStreamWriter;

import java.io.Writer;

import java.util.*;

//class Declaration

public class ItemsListProject

{

//main method

public static void main(String[] args) throws IOException

{

//Create Constructor default to instantiate the class

new ItemsListProject();

}

//Create scanner object

Scanner input = new Scanner(System.in);

//Constructor initialization

public ItemsListProject() throws IOException

{

//Create a temp object

Item item = new Item();

//Create arraylist

ArrayList<Item> cargohold = new ArrayList<Item>();

File file=new File("fileItems.txt");

//declare boolean flag variable

boolean flag=false;

//Using try catch block to create file if not exists

try

{

flag=file.createNewFile();

}

catch(Exception e)

{

e.printStackTrace();

}

//Using while loop to prompt for the values of items

while(true)

{

System.out.println("1:Add an item to the cargo hold.");

System.out.println("2:Add an item attribute to the cargo hold.");

System.out.println("3:Remove an item from the cargo hold.");

System.out.println("4:Sort the contents of the cargo hold .");

System.out.println("5:Search for an item.");

System.out.println("6:Search for an item by attribute.");

System.out.println("7:Display the items in the cargo hold.");

System.out.println("8:Perform a partial search for an item.");

System.out.println("0:Exit the BlackStar Cargo Hold interface.");

System.out.print("\nPlease enter the option: ");

//Prompt and read the choice

int userChoice = input.nextInt();

//create the file to store the items

switch(userChoice)

{

//Case 1 to read the item and the values

case 1:

addItemB(cargohold, item);

break;

//To prompt for the item attributes

case 2:

System.out.println("1: Add an equipable attributre.");

System.out.println("2: Add a consumble attribute.");

System.out.println("3: Add a weapon attribute.");

userChoice = input.nextInt();

//Prompt for the item attributes

switch(userChoice)

{

case 1:

item = new Equipable();

addItem(cargohold, item);

break;

case 2:

item = new Consumable();

addItem(cargohold, item);

break;

case 3:

item = new Weapon();

addItem(cargohold, item);

break;

}

break;

//For the case 3

case 3:

removeItem(cargohold);

break;

//For Filter Item

case 4:

filterItem(cargohold);

break;

// search Item

case 5:

searchItem(cargohold);

break;

//case 6 for search trhough Item Attribute

case 6:

searchByAttribute(cargohold);

break;

case 7:

//DisplayItems

displayItem(cargohold);

break;

case 8:

partialSearch(cargohold);

break;

case 0:

System.out.println("Thank you for using the BlackStar Cargo Hold interface. See you again soon!");

System.exit(0);

}

if(changeInFile(cargohold, "fileItems.txt"))

{

//save the list to the text file

saveToFile("fileItems.txt",cargohold);

}

System.out.println();

}

}

private boolean changeInFile(ArrayList<Item> cargohold, String filename) throws IOException

{

//compare list of items with file content, return true incase of a change

FileReader fr = new FileReader(filename);

BufferedReader br = new BufferedReader(fr);

String itemInfo=null;

int i=0;

boolean change=false;

while((itemInfo = br.readLine()) != null && i<cargohold.size())

{

Item item=cargohold.get(i);

if(!itemInfo.equals(item.getID()+"\t"+item.getName()+"\t"+item.getWeight()+"\t"+item.getDurability()+"\t"+

item.getCategory()+"\t"+item.getValue())){

change=true;

break;

}

i++;

}

if(br.readLine()!=null || i<cargohold.size())

return true;

return false;

}

//Implement the method to save the items to the file

private void saveToFile(String fileName, ArrayList<Item> cargohold) throws IOException{

Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileName), "utf-8"));

for(Item item: cargohold)

{

writer.write(item.getID()+"\t"+item.getName()+"\t"+item.getWeight()+"\t"+item.getDurability()+"\t"

+item.getCategory()+"\t"+item.getValue()+"\n");

}

//close the file

writer.close();

}

//add the items to the arrat list

private void addItemB(ArrayList<Item> cargohold, Item temp)

{

double getWeight = 0;

if(temp instanceof Item)

{

System.out.print("Enter the name of the item: ");

temp.setName(input.nextLine());

input.next();

System.out.print("Enter the item ID: ");

temp.setID(input.nextLine());

input.next();

System.out.print("Enter item weight: ");

getWeight = input.nextDouble();

if(getWeight > 25)

{

System.out.println("Weight Limit Exceed");

return;

}

else

{

System.out.print("Enter the item value: ");

temp.setValue(input.next());

System.out.print("Enter the item durability: ");

temp.setDurability(input.next());

cargohold.add(temp);

}

}

}

//add items to the list

private void addItem(ArrayList<Item> cargohold, Item temp)

{

if(temp instanceof Equipable)

{

System.out.print("Enter equipable item ID: ");

temp.setID(input.nextLine());

input.next();

System.out.print("Enter equipable attribute name: ");

temp.setName(input.nextLine());

input.next();

System.out.print("Enter equipable attribute color: ");

((Equipable)temp).setColor(input.nextLine());

input.next();

System.out.print("Is this an outfit (Y/N): ");

String outfit = input.nextLine();

String y = "y";

if(y.equalsIgnoreCase(outfit.trim()))

{

((Equipable)temp).setoutfit(true);

}

else

{

((Equipable)temp).setoutfit(false);

}

System.out.print("What is the item size: ");

((Equipable)temp).setSize(input.nextInt());

cargohold.add(temp);

}

else if(temp instanceof Consumable)

{

System.out.print("Enter the consumable ID: ");

((Consumable)temp).setID(input.nextLine());

input.next();

System.out.print("Enter the consumable name: ");

((Consumable)temp).setName(input.nextLine());

input.next();

System.out.print("Enter the consumable color: ");

((Consumable)temp).setColor(input.nextLine());

input.next();

System.out.print("Is the consumable a food (Y/N): ");

String Food = input.nextLine();

input.next();

String y = "y";

if(y.equalsIgnoreCase(Food.trim())){

((Consumable)temp).setFood(true);

}

else{

((Consumable)temp).setFood(false);

}

System.out.print("Is the consumable water(Y/N): ");

String Water = input.nextLine();

input.next();

if(y.equalsIgnoreCase(Water.trim())){

((Consumable)temp).setWater(true);

}

else{

((Consumable)temp).setWater(false);

}

System.out.print("Is the consumable healthy (Y/N): ");

String Healthy = input.nextLine();

input.next();

if(y.equalsIgnoreCase(Healthy.trim())){

((Consumable)temp).setHealthy(true);

}

else

{

((Consumable)temp).setHealthy(false);

}

cargohold.add(temp);

}

else

{

System.out.print("Enter weapon ID: ");

((Weapon)temp).setID(input.nextLine());

input.next();

System.out.print("What is the weapon name: ");

((Weapon)temp).setName(input.nextLine());

input.next();

System.out.print("Enter fungus color: ");

((Weapon)temp).setColor(input.nextLine());

input.next();

System.out.print("Is it a projectile (Y/N): ");

String Projectile = input.nextLine();

String y = "y";

if(y.equalsIgnoreCase(Projectile.trim())){

((Weapon)temp).setProjectile(true);

}

else{

((Weapon)temp).setProjectile(false);

}

cargohold.add(temp);

}

}

private void removeItem(ArrayList<Item> cargohold){

System.out.print("Name of item to Remove: ");

String item = input.nextLine();

for(Item x: cargohold){

if (x.getName().equals(item))

{

cargohold.remove(x);

break;

}

}

}

private void filterItem(ArrayList<Item> cargohold) {

for (int i = 0; i < cargohold.size() - 1; i++ )

for (int j = 0; j < cargohold.size() - 1 - i; j++)

if (cargohold.get(j).getName().compareToIgnoreCase(cargohold.get(j+1).getName()) > 0) {

cargohold.add(j+1, cargohold.remove(j));

}

System.out.println("Item NOT found");

}

private void searchItem(ArrayList<Item> cargohold)

{

int itemfound = 0;

System.out.print("Search items: ");

String item = input.nextLine();

for (Item x : cargohold) {

if (x.getName().equalsIgnoreCase(item))

{

System.out.println(x.getName() + " found");

itemfound = 1;

break;

}

}

if(itemfound == 0)

{

System.out.println("Item NOT found");

}

}

private void searchByWeight(ArrayList<Item> cargohold) {

int itemfound = 0;

System.out.print("Provide weight: ");

int weight = Integer.parseInt(input.nextLine());

for (Item x : cargohold) {

if (x.getWeight()==weight)

{

System.out.println(x.getName() + " found to have this weight");

itemfound = 1;

//multiple items can be found in this case, so don't break

}

}

if(itemfound == 0){

System.out.println("Item NOT found");

}

}

private void searchByCategory(ArrayList<Item> cargohold) {

int itemfound = 0;

System.out.print("Provide weight: ");

String category = input.nextLine();

for (Item x : cargohold) {

if (x.getCategory().equalsIgnoreCase(category))

{

System.out.println(x.getName() + " found to have this category");

itemfound = 1;

}

}

if(itemfound == 0)

{

System.out.println("Item NOT found");

}

}

private void searchByDurability(ArrayList<Item> cargohold)

{

int itemfound = 0;

System.out.print("Provide durability: ");

String durability = input.nextLine();

for (Item x : cargohold) {

if (x.getDurability().equalsIgnoreCase(durability))

{

System.out.println(x.getName() + " found to have this durability");

itemfound = 1;

//multiple items can be found in this case, so don't break

}

}

if(itemfound == 0)

{

System.out.println("Item NOT found");

}

}

private void searchByValue(ArrayList<Item> cargohold)

{

int itemfound = 0;

System.out.print("Provide durability: ");

String value = input.nextLine();

for (Item x : cargohold) {

if (x.getValue().equalsIgnoreCase(value))

{

System.out.println(x.getName() + " found to have this value");

itemfound = 1;

//multiple items can be found in this case, so don't break

}

}

if(itemfound == 0){

System.out.println("Item NOT found");

}

}

private void searchByID(ArrayList<Item> cargohold) {

int itemfound = 0;

System.out.print("Provide durability: ");

String Id = input.nextLine();

for (Item x : cargohold) {

if (x.getID().equalsIgnoreCase(Id))

{

System.out.println(x.getName() + " found to have this ID");

itemfound = 1;

break;

}

}

if(itemfound == 0){

System.out.println("Item NOT found");

}

}

private void searchByAttribute (ArrayList<Item> cargohold){

System.out.println("What the is the item attribute?");

String attribute=input.nextLine();

if(("name").equalsIgnoreCase(attribute))

searchItem(cargohold);

else if(("weight").equalsIgnoreCase(attribute))

searchByWeight(cargohold);

else if(("category").equalsIgnoreCase(attribute))

searchByCategory(cargohold);

else if(("durability").equalsIgnoreCase(attribute))

searchByDurability(cargohold);

else if(("value").equalsIgnoreCase(attribute))

searchByValue(cargohold);

else

searchByID(cargohold); //In default case we search by ID

}

//Displayelements in the list

private void displayItem(ArrayList<Item> cargohold)

{

for (Item x : cargohold)

{

System.out.println("Item ID " + x.getID() + " Item Name " + x.getName());

}

}

private void partialSearch(ArrayList<Item> cargohold) {

boolean flagFound = false;

System.out.println("Enter name of item to search: ");

String partialName = input.nextLine();

for (int i = 0; i < cargohold.size(); i++)

if (cargohold.get(i).getName().contains(partialName)) {

System.out.println("Found " + cargohold.get(i).getName() + " at location " + i);

flagFound = true;

}

if (!flagFound)

System.out.println("The items are not found");

}

}

Consumable.java

//Declare the class Consumable

public class Consumable extends Item

{

//Declare the local variables

String Color;

public boolean food;

public boolean water;

public boolean healthy;

//Constructor

public Consumable()

{

}

// Create an overridden constructor here

public Consumable(boolean food, boolean water, boolean healthy)

{

this.food = food;

this.water = water;

this.healthy = healthy;

}

//Implemnt getter and setter methods

public boolean isFood() {

return food;

}

public void setFood(boolean food) {

this.food = food;

}

public boolean isWater() {

return water;

}

public void setWater(boolean water) {

this.water = water;

}

public String getColor() {

return Color;

}

public void setColor(String Color) {

this.Color = Color;

}

public boolean isHealthy() {

return healthy;

}

public void setHealthy(boolean healthy) {

this.healthy = healthy;

}

public void Name()

{

super.getName();

}

public void ID()

{

super.getID();

}

}

Equipable.java

//Declare the class Equipable

public class Equipable extends Item

{

//declare the local variables

private String Color;

boolean outfit;

private int Size;

//Implement the getter and setter methods

public String getColor() {

return Color;

}

public void setColor(String Color) {

this.Color = Color;

}

public boolean isoutfit() {

return outfit;

}

public void setoutfit(boolean outfit) {

this.outfit = outfit;

}

public int getSize() {

return Size;

}

public void setSize(int Size) {

this.Size = Size;

}

}

Weapon.java

//Declare the class Weapon

public class Weapon extends Item {

//Declare the local variables

String Color;

public boolean projectile;

//constructor

public Weapon() {

}

// Create an overridden constructor here

public Weapon(boolean projectile) {

this.projectile = projectile;

}

//getter and setter methods

public boolean isProjectile() {

return projectile;

}

public void setProjectile(boolean projectile) {

this.projectile = projectile;

}

public String getColor() {

return Color;

}

public void setColor(String Color) {

this.Color = Color;

}

//from super

void Name(){

super.getName();

}

void ID(){

super.getID();

}

}

Item.java

//Declare the class

public class Item

{

//declare the variables

String name;

String ID;

String category;

double weight;

String value;

String durability;

//getter and setter methods

public String getName()

{

return this.name;

}

public void setName(String name)

{

this.name = name;

}

public String getID()

{

return this.ID;

}

public void setID(String ID)

{

this.ID = ID;

}

public double getWeight()

{

return this.weight;

}

public void setWeight(Double weight)

{

this.weight = weight;

}

public String getValue(){

return this.value;

}

public void setValue(String value)

{

this.value = value;

}

public String getDurability()

{

return durability;

}

public void setDurability(String durability){

this.durability = durability;

}

//Create accessors and mutators for your triats.

public void setCategory(String category) {

this.category = category;

}

public String getCategory() {

return this.category;

}

}

Output