NumberFormatException when trying to convert the contents of a String Array into an Integer to be stored in an ArrayList

Question

This is my current code:

    ArrayList<String> arrayCurrency = new ArrayList<String>();
    ArrayList<Integer> arrayRate = new ArrayList<Integer>();
    ArrayList<String> arraySymbol = new ArrayList<String>();

public void loadFile() {

    File file = new File("C://Users//me//Documents//TestingAssignment//Assignment 2 Part 2//src/currency2.txt");

    try {
        BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(file), "UTF8"));

        String line = in.readLine().trim();

        while (line != null) {

            String[] parts = line.split(",");

            line = in.readLine(); 

            String currency = parts[0].trim();
            String rate = parts[1].trim();
            String symbol = parts[2].trim();


            int rateConverted = Integer.parseInt(rate);

            //int thisRate = rateConverted2;

            arrayCurrency.add(currency);
            arrayRate.add(rateConverted);
            arraySymbol.add(symbol);

        }

        for(String name:arrayCurrency) {
            System.out.println(name);
        }

        for(int name:arrayRate) {
            System.out.println(name);
        } 

        for(String name:arraySymbol) {
            System.out.println(name);
        } 

        in.close();

    } catch (Exception e) {

        String msg = e.getMessage();

        JOptionPane.showMessageDialog(null, msg);
    }

}

I have gone through the code with a debugger. It happens when it attempts to convert the first number in the text file.

An example of how the .txt file is set out:

US Dollars, 1.60, $

I want to split this up into 3 different arrays. However, I am having a problem trying to convert parts[1].trim(); into an Integer so that it can be stored in ArrayList<Integer> arrayRate = new ArrayList<Integer>();.

The error message shown is: "For Input String:" 1.60".

Any help is appreciated. Thanks.

Answer 1

1.6 is not an Integer. You will need to store it in a Double List and convert to double using methods of Double class.

ArrayList<Double> arrayRate = new ArrayList<>();
Double dnum = Double.parseDouble(str);

Use this link for reference - https://beginnersbook.com/2013/12/how-to-convert-string-to-double-in-java/