Java Multiplying 2 integers from strings

I've tried searching a number of threads in terms of multiplying 2 strings. However, it seems that most of the links I found weren't applicable or I couldn't interpret them well enough.

Would it be possible if could tell me what is wrong with my current code?

public static void main(String[] args) {

    String sample = value1();
    String sample2 = value2();
            //========== Test if users placed any characters within the boxes =========\\
            try {
                Integer.parseInt(sample);
            } catch (NumberFormatException e) {
                System.out.println("System detects that you are using characters");
                return;
            }
            try {
                Integer.parseInt(sample2);
            } catch (NumberFormatException e) {
                System.out.println("System detects that you are using characters");
                return;
            }
     Integer.parseInt(sample); 
     Integer.parseInt(sample2);
    System.out.println("The total multiplication that you have inserted is "+sample * sample2+ ".");
}

public static String value1() { //obtain first user input. 

    String sample = JOptionPane.showInputDialog(null, "Insert Value", "Enter amount ", JOptionPane.QUESTION_MESSAGE);
    if (sample.isEmpty()) {

        JOptionPane.showMessageDialog(null, "Error!", "No Value Detected", JOptionPane.ERROR_MESSAGE);
        sample = value1();


    }
    return sample;

}

public static String value2() { //obtain second user input. 

    String sample2 = JOptionPane.showInputDialog(null, "Insert Value", "Enter amount ", JOptionPane.QUESTION_MESSAGE);
    if (sample2.isEmpty()) {

        JOptionPane.showMessageDialog(null, "Error!", "No Value Detected", JOptionPane.ERROR_MESSAGE);
        sample2 = value2();


    }
    return sample2;

}

}

My final output should multiply the following numbers

System.out.println("The total multiplication that you have inserted is "+sample * sample2+ ".");

Jon Skeet
people
quotationmark

You can't multiply strings together. You can multiply numbers, and it sounds like that's what you want to do. Indeed, you're already parsing the strings as integers - and then ignoring the result. You just need to change this:

 Integer.parseInt(sample); 
 Integer.parseInt(sample2);
 System.out.println("The total multiplication that you have inserted is "+sample * sample2+ ".");

to:

 int value1 = Integer.parseInt(sample); 
 int value2 = Integer.parseInt(sample2);
 System.out.println("The total multiplication that you have inserted is "
     + (value1 * value2) + ".");

people

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