Let the user set in a number

Question

Hello, I want to make a program where the user can put in a number an get a conversion to another valuta..
//Exchange to NOK
               public double beregnTilNok(int antall){
                    return antall * kurs / enhet;
               // Beregn from NOK to valuta
                public double beregnFraNok(double nok){
                    return nok * enhet / kurs;
TEST METODE FOR VALUTA
     class Oving06{
          public static void main(String[] args){
               // lager et objekt av valuta klassen svenske kroner:
               Valuta svenskValuta = new Valuta("Sek", 80.24, 100);
// Beregn metode svenske:
               String tekskt = showInputDialog("Legg inn antall kroner som skal konverteres: ");
               //double tall1 = Double.parseDouble(tall1Lest);
               System.out.println("Dette gir: " + svenskValuta.beregnTilNok(6) + " norske kroner.");
}

Answer 1

I would create a console. That is, after the user runs the program, it prompts the user for a line of input.
For example:
public static void main(String[] args) {
     Scanner input = new Scanner(System.in); // This reads in lines from standard in.
     while(true) {
          System.out.print("Enter a number > ");
          String line = input.nextLine();
          try {
               double value = Double.parseDouble(line.trim());
               double converted_value = beregnTilNok(value);
               System.out.println("Converted " + value + " to " + value + ".");
          } catch (Exception e) {continue;}
}You do not need the while loop if you only want to ask your user for one line of input.
~ Anthop