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Thread: Need help with Currency Symbol format

  1. #1
    Junior Member
    Join Date
    May 2014
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    Default Need help with Currency Symbol format

    package billing.util;
    import java.math.RoundingMode;
    import java.text.NumberFormat;
    import java.util.Scanner;
    public class CurrencyFormat {
        private static final int USD = 0;
        private static final int JPY = 1;
        private static final int CNY = 2;
        private static final String US_DOLLAR_SYMBOL = "$";
        private static final String JP_YEN_SYMBOL = "\\u00A5"; 
        private static final String CN_YUAN_SYMBOL = "\\u00A5"; 
        // Object fields
        private final NumberFormat formatter; // Number formatter wrapped by this class
        private int currencyType; // Currency type code
        private String currencySymbl; //
        private int fractionDigits;
        private int maxIntDigits;
        /** Creates a currency object in the default format.
        public CurrencyFormat(){
            currencyType = USD;
            currencySymbl = US_DOLLAR_SYMBOL;
            fractionDigits = 2;
            maxIntDigits = 0;
            formatter = NumberFormat.getInstance();
            if (maxIntDigits > 0) {
                formatter.setMaximumIntegerDigits (maxIntDigits);
        public static CurrencyFormat getInstance(){
            return new CurrencyFormat();
        public String format (double input) {
            //determin integer digits in number
        int intDigits = 0;
        if (input>=1) {
        intDigits =1 +(int) Math.log10(input);
        //determines spaces for currency symbol alignment
        int spaces = maxIntDigits - intDigits;
    //Use one less alignment space if a zero is front of the decimal place is wanted
    if (spaces == maxIntDigits ) {
    	spaces --;
    //format the number portion.
    input = (Math.round (input * Math.pow(10,fractionDigits))
            / (Math.pow (10.0, fractionDigits)));
    String baseFormat =formatter.format (input);
    //Start buildning the currency format . Start with the currency Symbol, then add alignment spaces.
    StringBuilder finalFormat = new StringBuilder (currencySymbl);
    for ( int i =0; i<spaces; i ++) {
    	finalFormat.append(" ");
    //Check if an additional alignment space is needed for the thousands
    if(maxIntDigits > 3 && intDigits <4) {
    	finalFormat.append(" ");
    //Add the formatted number to the right of the currency symbol and alignment spaces.
    return finalFormat.toString();
        public void setFractionDigits (int fractionDigits){
            this.fractionDigits = fractionDigits;
        public void setInterDigits (int intergerDigits){
            maxIntDigits = intergerDigits;
        public void setCurrency (int currencyCode){
            if (currencyCode == JPY){
                currencyType = JPY;
            currencySymbl = JP_YEN_SYMBOL;
        } else if (currencyCode == CNY){
            currencyType = CNY;
            currencySymbl = CN_YUAN_SYMBOL;
        } else if (currencyCode == USD)
            currencyType = USD;
            currencySymbl = US_DOLLAR_SYMBOL;
        public static void main (String [] args) {
            CurrencyFormat currencyFormatter = new CurrencyFormat();
            Scanner sc = new Scanner(System.in);
            System.out.println("Enter currency, interger digits, fraction digits, and input"
                    + "number: ");
            String currency = sc.next();
            int intergerDigits = sc.nextInt();
            int fractionDigits = sc.nextInt();
            double number = sc.nextDouble();
            switch (currency){
                case "JPY":
            case "CNY":
            currencyFormatter.setCurrency (CNY);
            System.out.println("Test Case result " + currencyFormatter.format(number));

    i should be able to use USD, CNY, and JPY. However it seems only the USD ($) will run... doesnt matter which currency symbol the user requests
    Last edited by champanedout; May 19th, 2014 at 02:30 PM.

  2. #2
    Super Moderator
    Join Date
    Jun 2013
    So. Maryland, USA
    My Mood
    Thanked 698 Times in 680 Posts

    Default Re: Need help with Currency Symbol format

    Welcome to the forum! Thanks for taking the time to learn how to post code correctly. If you haven't already, please read this topic to learn other useful info for new members.

    And thanks for providing a runnable example. Since the user input is unclear, sample runs would also be helpful. Show a few user inputs, actual results, and desired results.

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