Get All Possible Available Currencies

After studying the ISO table and the Currency class documentation, it seems that you can ask for currency as code or as Locale; and the class Locale has a getAvailableLocales() method.

So, the code would be:

    public static Set<Currency> getAllCurrencies()
    {
        Set<Currency> toret = new HashSet<Currency>();
        Locale[] locs = Locale.getAvailableLocales();

        for(Locale loc : locs) {
            try {
                Currency currency = Currency.getInstance( loc );

                if ( currency != null ) {
                    toret.add( currency );
                }
            } catch(Exception exc)
            {
                // Locale not found
            }
        }

        return toret;
    }

Hope this helps.

This may be helpful for those who want to get it as a Java enumeration

    public enum Currency {
    AED("AED"), AFN("AFN"), ALL("ALL"), AMD("AMD"), ANG("ANG"), AOA("AOA"), ARS("ARS"), AUD("AUD"), AWG("AWG"), AZN("AZN"), BAM("BAM"), BBD("BBD"),
    BDT("BDT"), BGN("BGN"), BHD("BHD"), BIF("BIF"), BMD("BMD"), BND("BND"), BOB("BOB"), BOV("BOV"), BRL("BRL"), BSD("BSD"), BTN("BTN"), BWP("BWP"),
    BYN("BYN"), BYR("BYR"), BZD("BZD"), CAD("CAD"), CDF("CDF"), CHE("CHE"), CHF("CHF"), CHW("CHW"), CLF("CLF"), CLP("CLP"), CNY("CNY"), COP("COP"),
    COU("COU"), CRC("CRC"), CUC("CUC"), CUP("CUP"), CVE("CVE"), CZK("CZK"), DJF("DJF"), DKK("DKK"), DOP("DOP"), DZD("DZD"), EGP("EGP"), ERN("ERN"),
    ETB("ETB"), EUR("EUR"), FJD("FJD"), FKP("FKP"), GBP("GBP"), GEL("GEL"), GHS("GHS"), GIP("GIP"), GMD("GMD"), GNF("GNF"), GTQ("GTQ"), GYD("GYD"),
    HKD("HKD"), HNL("HNL"), HRK("HRK"), HTG("HTG"), HUF("HUF"), IDR("IDR"), ILS("ILS"), INR("INR"), IQD("IQD"), IRR("IRR"), ISK("ISK"), JMD("JMD"),
    JOD("JOD"), JPY("JPY"), KES("KES"), KGS("KGS"), KHR("KHR"), KMF("KMF"), KPW("KPW"), KRW("KRW"), KWD("KWD"), KYD("KYD"), KZT("KZT"), LAK("LAK"),
    LBP("LBP"), LKR("LKR"), LRD("LRD"), LSL("LSL"), LYD("LYD"), MAD("MAD"), MDL("MDL"), MGA("MGA"), MKD("MKD"), MMK("MMK"), MNT("MNT"), MOP("MOP"),
    MRO("MRO"), MUR("MUR"), MVR("MVR"), MWK("MWK"), MXN("MXN"), MXV("MXV"), MYR("MYR"), MZN("MZN"), NAD("NAD"), NGN("NGN"), NIO("NIO"), NOK("NOK"),
    NPR("NPR"), NZD("NZD"), OMR("OMR"), PAB("PAB"), PEN("PEN"), PGK("PGK"), PHP("PHP"), PKR("PKR"), PLN("PLN"), PYG("PYG"), QAR("QAR"), RON("RON"),
    RSD("RSD"), RUB("RUB"), RWF("RWF"), SAR("SAR"), SBD("SBD"), SCR("SCR"), SDG("SDG"), SEK("SEK"), SGD("SGD"), SHP("SHP"), SLL("SLL"), SOS("SOS"),
    SRD("SRD"), SSP("SSP"), STD("STD"), SYP("SYP"), SZL("SZL"), THB("THB"), TJS("TJS"), TMT("TMT"), TND("TND"), TOP("TOP"), TRY("TRY"), TTD("TTD"),
    TWD("TWD"), TZS("TZS"), UAH("UAH"), UGX("UGX"), USD("USD"), USN("USN"), UYI("UYI"), UYU("UYU"), UZS("UZS"), VEF("VEF"), VND("VND"), VUV("VUV"),
    WST("WST"), XAF("XAF"), XAG("XAG"), XAU("XAU"), XBA("XBA"), XBB("XBB"), XBC("XBC"), XBD("XBD"), XCD("XCD"), XDR("XDR"), XFU("XFU"), XOF("XOF"),
    XPD("XPD"), XPF("XPF"), XPT("XPT"), XSU("XSU"), XTS("XTS"), XUA("XUA"), XXX("XXX"), YER("YER"), ZAR("ZAR"), ZMW("ZMW");

    private String iso4217Code = "";

    Currency(String code) {
        this.iso4217Code = code;
    }

    @Override
    public String toString() {
        return iso4217Code;
    }
}