Java Utililty Methods Currency Code Get

Set<String> codes = new HashSet<>();
if (isValidCode(c)) {
    for (Locale l : Locale.getAvailableLocales()) {
        try {
            Currency currentCurrency = Currency.getInstance(l);
            if (currentCurrency.getCurrencyCode().equals(c)) {
                codes.add(l.getCountry());
        } catch (IllegalArgumentException e) {
return new ArrayList<>(codes);

try {
    return Currency.getInstance(currency);
} catch (IllegalArgumentException e) {
    return null;

if (_allCurrencySymbols == null) {
    Locale[] locals = Locale.getAvailableLocales();
    ArrayList list = new ArrayList();
    for (int i = 0; i < locals.length; i++) {
        list.add(NumberFormat.getInstance(locals[i]).getCurrency().getSymbol(locals[i]));
    _allCurrencySymbols = (String[]) list.toArray(new String[list.size()]);
    return _allCurrencySymbols;
...

return Currency.getInstance(code);

String display = "";
try {
    if (amount != null && !isEmpty(amount))
        display = NumberFormat.getCurrencyInstance().format(amount);
} catch (IllegalArgumentException ie) {
return display;

NumberFormat nf = NumberFormat.getCurrencyInstance(Locale.CHINA);
nf.setMaximumFractionDigits(dec);
return nf.format(num);

NumberFormat numberFormat = DecimalFormat.getIntegerInstance();
String text = numberFormat.format(value) + " C-Bills";
return text;

return NumberFormat.getNumberInstance(Locale.getDefault()).getCurrency();

try {
    return Currency.getInstance(currencyCode);
} catch (Exception e) {
    return Currency.getInstance(Locale.US);