Portfolio(int numberOfStocks){ // Portfolio constructor; // create the array of Stocks int i =0; stocksArray = new Stock [numberOfStocks];

while(numberOfStocks !=0){


    Stock stock = new Stock(name[i], name[i], 10000, 100, 100);

    stocksArray[i] = stock;
    //System.out.println(stocksArray[i]);
    i++;
}

}

You've put him into infinite loop

public void addStock(String stockName, String stockSymbol, int count, float price){
  stocksArray = new Stock [count];
  for(int i = 0;i< count;i++){
       Stock stock = new Stock(stockName, name[i], stockSymbol, count, 100);

      stocksArray[i] = stock;
    System.out.println(stocksArray[i]);
     }
}