JAVA HELP! my code compiles but there is still an error?

import java.util.*;

import java.text.*;

public class Stocks {

private int shares;

private int price;

private int temp;

private static int total;

private int finalPrice;

private int finalShares;

private Queue<Stocks> StockList = new LinkedList<Stocks>();

private static NumberFormat nf = NumberFormat.getCurrencyInstance();

public Stocks()

{

shares = 0;

price = 0;

}

public Stocks(int shares, int price)

{

this.shares = shares;

this.price = price;

}

public int getShares()

{

return this.shares;

}

public int getPrice()

{

return this.price;

}

public void setShares(int shares)

{

this.shares = shares;

}

public void setPrice(int price)

{

this.price = price;

}

public void sell() {

int sharesToSell = this.getShares();

int priceToSell = this.getPrice();

while (!StockList.isEmpty()) {

int numShares = StockList.peek().getShares();

int sharePrice = StockList.peek().getPrice();

if (numShares < sharesToSell || numShares == sharesToSell) {

temp = sharesToSell - numShares; // remaining shares to sell

finalShares = sharesToSell - temp; // # shares selling at price

finalPrice = priceToSell - sharePrice; // shares sold at adjusted price

total += (finalPrice * finalShares); // Calculates total price

StockList.remove();

sharesToSell = temp; // Remaining shares needed to be sold @ price

}

if (numShares > sharesToSell) {

temp = numShares - sharesToSell; // Remaining shares that were bought

finalPrice = priceToSell - sharePrice; // Shares sold at adjusted price

total += (finalPrice * sharesToSell); // adds to running total

StockList.peek().setShares(temp);

}

}

}

public void buy() {

int numShares = this.getShares();

int priceToBuy = this.getPrice();

Stocks newStock = new Stocks(numShares,priceToBuy);

StockList.add(newStock); // adds stock to list

int temptotal = (numShares * priceToBuy); // decreases running total

total += (-1 * temptotal);

}

public static int getTotal() { // gets total profit (or loss)

return total;

}

// *****MAIN METHOD*****

public static void main(String[] args){

Scanner scan = new Scanner(System.in);

System.out.println("Enter transaction sequence:");

String input = scan.nextLine().trim();

String[] inputArray = new String[50];

String[] inputArray2 = new String[50];

int numShares, sharePrice;

inputArray = input.split(";");

for (String i : inputArray) {

if (i.toUpperCase().contains("BUY")) {

inputArray2 = i.split(" ");

inputArray2[4] = inputArray2[4].substring(1);

try {

numShares = Integer.parseInt(inputArray2[1]);

sharePrice = Integer.parseInt(inputArray2[4]);

Stocks newStock = new Stocks(numShares,sharePrice);

newStock.buy();

} catch (NumberFormatException e) {

System.out.println("Error");

return;

}

}

else if (i.toUpperCase().contains("SELL")) {

inputArray2 = input.split(" ");

inputArray2[4] = inputArray2[4].substring(1);

try {

numShares = Integer.parseInt(inputArray2[1]);

sharePrice = Integer.parseInt(inputArray2[4]);

Stocks newStock = new Stocks(numShares,sharePrice);

newStock.sell();

} catch (NumberFormatException e) {

System.out.println("Error");

return;

}

} else {

System.out.println("Error - input does not contain buy/sell");

}

} System.out.println(nf.format(getTotal()));

}

}

this program compiles but when i enter transaction sequence which is either buy/sell an error follows it