Implement the following:  1. Add the missing functionality in “controller.java” to finish the “sellLIFO” and “sellFIFO” methods. 2. Provide error checking so users can’t sell a stock they don’t own or try to sell more stock than they own. Eliminate that runtime exception. 3. We think its sort of limited to only work with just two stocks. You need to change the user input, so the user enters the stock name they wish to buy or sell instead of just choosing between Google and Amazon. Keep the command line interface since we are only in the testing phase.  4. We like the layout and design of the application so don’t change any of the other methods or objects. Only edit the Controller.java file!

import java.util.HashMap;

import java.util.LinkedList;

import java.util.Scanner;

public class Controller {

privateHashMap<String,LinkedList<Stock>>stockMap;

publicController(){

stockMap=newHashMap<>();

Scannerinput=newScanner(System.in);

do{

// Prompt for stock name or option to quit

System.out.print("Enter stock name or 3 to quit: ");

StringstockName=input.next();

if(stockName.equals("3")){

break;// Exit if user inputs '3'

}

// Get or create a list for the specified stock

LinkedList<Stock>stockList=stockMap.computeIfAbsent(stockName,k->newLinkedList<>());

// Prompt to buy or sell

System.out.print("Input 1 to buy, 2 to sell: ");

intcontrolNum=input.nextInt();

System.out.print("How many stocks: ");

intquantity=input.nextInt();

if(controlNum==1){

// Buying stocks

System.out.print("At what price: ");

doubleprice=input.nextDouble();

buyStock(stockList,stockName,quantity,price);

}else{

// Selling stocks

System.out.print("Press 1 for LIFO accounting, 2 for FIFO accounting: ");

controlNum=input.nextInt();

if(controlNum==1){

// Sell using LIFO method

sellLIFO(stockList,quantity);

}else{

// Sell using FIFO method

sellFIFO(stockList,quantity);

}

}

}while(true);

input.close();// Close the scanner

}

publicstaticvoidbuyStock(LinkedList<Stock>list,Stringname,intquantity,doubleprice){

// Create a new stock object and add it to the list

Stocktemp=newStock(name,quantity,price);

list.push(temp);

// Display purchase details

System.out.printf("You bought %d shares of %s stock at $%.2f per share %n",quantity,name,price);

}

publicstaticvoidsellLIFO(LinkedList<Stock>list,intnumToSell){

// Check if there are enough stocks to sell

inttotalQuantity=list.stream().mapToInt(Stock::getQuantity).sum();

if(totalQuantity<numToSell){

System.out.println("Not enough stocks to sell.");

return;

}

doubletotal=0;

doubleprofit=0;

intremainingToSell=numToSell;

while(remainingToSell>0){

// Retrieve and sell stocks using LIFO

StocklastStock=list.peek();

if(lastStock.getQuantity()<=remainingToSell){

remainingToSell-=lastStock.getQuantity();

total+=lastStock.getPrice()*lastStock.getQuantity();

profit+=lastStock.getPrice()*lastStock.getQuantity();

list.pop();// Remove stock from the list

}else{

lastStock.setQuantity(lastStock.getQuantity()-remainingToSell);

total+=lastStock.getPrice()*remainingToSell;

profit+=lastStock.getPrice()*remainingToSell;

remainingToSell=0;

}

}

// Display sale details

System.out.printf("You sold %d shares of %s stock at %.2f per share %n",numToSell,list.peek().getName(),total/numToSell);

System.out.printf("You made $%.2f on the sale %n",profit);

}

publicstaticvoidsellFIFO(LinkedList<Stock>list,intnumToSell){

// Check if there are enough stocks to sell

inttotalQuantity=list.stream().mapToInt(Stock::getQuantity).sum();

if(totalQuantity<numToSell){

System.out.println("Not enough stocks to sell.");

return;

}

doubletotal=0;

doubleprofit=0;

intremainingToSell=numToSell;

while(remainingToSell>0){

// Retrieve and sell stocks using FIFO

StockfirstStock=list.peekLast();// Get the first element (FIFO)

if(firstStock.getQuantity()<=remainingToSell){

remainingToSell-=firstStock.getQuantity();

total+=firstStock.getPrice()*firstStock.getQuantity();

profit+=firstStock.getPrice()*firstStock.getQuantity();

list.removeLast();// Remove stock from the list (FIFO)

}else{

firstStock.setQuantity(firstStock.getQuantity()-remainingToSell);

total+=firstStock.getPrice()*remainingToSell;

profit+=firstStock.getPrice()*remainingToSell;

remainingToSell=0;

}

}

// Display sale details

System.out.printf("You sold %d shares of %s stock at %.2f per share %n",numToSell,list.peekLast().getName(),total/numToSell);

System.out.printf("You made $%.2f on the sale %n",profit);

}

}

Rewrite without using Hashmap, but just stick with the LinkedList instead! The output should display the profit made from sales!

If I bought 30 stocks of Google for 120 then I decide to sell 5 Google stocks at 140, then the output should display the gained profit!