Hi Friend,

The "use unchecked or unsafe operations" warning indicates that you have missed a type declaration.

We have modified your code.Try it.

import java.util.ArrayList;

public class ThreeArrayLists {

public static void main(String[] args) {
ArrayList<Double> priceList = new ArrayList<Double>();
ArrayList<Double> quantityList = new ArrayList<Double>();
ArrayList<Double> amountList = new ArrayList<Double>();

priceList.add(new Double(10.62));
priceList.add(new Double(14.89));
priceList.add(new Double(13.21));
priceList.add(new Double(16.55));
priceList.add(new Double(18.62));
priceList.add(new Double(9.47));
priceList.add(new Double(6.58));
priceList.add(new Double(18.32));
priceList.add(new Double(12.15));
priceList.add(new Double(3.98));

quantityList.add(new Double(4.0));
quantityList.add(new Double(8.5));
quantityList.add(new Double(6.0));
quantityList.add(new Double(7.35));
quantityList.add(new Double(9.0));
quantityList.add(new Double(15.3));
quantityList.add(new Double(3));
quantityList.add(new Double(5.4));
quantityList.add(new Double(2.9));
quantityList.add(new Double(4.8));

for (int i = 0; i < 10; i++) {
amountList.add((Double.valueOf(priceList.get(i).toString())) * (Double.valueOf(quantityList.get(i).toString())));
System.out.printf("%d) %.2f * %.2f = %.2f \n",i+1, Double.valueOf(priceList.get(i).toString()), Double.valueOf(quantityList.get(i).toString()), Double.valueOf(amountList.get(i).toString()));
}
}
}

Thanks