private void promptOperation() {
String stockSymbol = getInput("Please enter the stock symbol : ");
DataHolder dataHolder = DataHolder.getInstance();
Stock stock = null;
if (stockSymbol != null) {
stock = dataHolder.getStock(stockSymbol.toUpperCase());
}
if (stock != null) {
System.out.println(stock);
promptMarketPrice(stock);
} else {
System.out.println("Invalid stock symbol! ");
promptOperation();
}
fetchStockPerformance(stock);
}
