test.java

    private void test(List<ExchangeRate> exchangeRates) {
        Map<String, ExchangeRate> rateType11Map = new HashMap<String, ExchangeRate>();
        Map<String, ExchangeRate> rateType12Map = new HashMap<String, ExchangeRate>();

        Collections.sort(exchangeRates, new Comparator<ExchangeRate>() {
            @Override
            public int compare(ExchangeRate e1, ExchangeRate e2) {
                return ComparisonChain.start()
                        .compare(e1.getRateCurrency(), e2.getRateCurrency())
                        .compare(e1.getRateType(), e2.getRateType())
                        .result();
            }
        });

        for (ExchangeRate exchangeRate : exchangeRates) {
            String rateCurrency = exchangeRate.getRateCurrency();

            if (rateType11Map.containsKey(rateCurrency)) {
                rateType12Map.put(rateCurrency, exchangeRate);
            } else {
                rateType11Map.put(rateCurrency, exchangeRate);
            }
        }
    }