通过java脚本实现货币兑换购物

import java.util.HashMap;

public class CurrencyConverter {
    private HashMap<String, Double> exchangeRates;

    public CurrencyConverter() {
        exchangeRates = new HashMap<String, Double>();
    }

    public void setExchangeRate(String currencyCode, double rate) {
        exchangeRates.put(currencyCode, rate);
    }

    public double convertCurrency(double amount, String sourceCurrency, String targetCurrency) {
        double sourceRate = exchangeRates.get(sourceCurrency);
        double targetRate = exchangeRates.get(targetCurrency);
        double baseAmount = amount / sourceRate;
        return baseAmount * targetRate;
    }

    public static void main(String[] args) {
        CurrencyConverter converter = new CurrencyConverter();
        converter.setExchangeRate("USD", 1.0); // 设置美元汇率为1.0
        converter.setExchangeRate("CNY", 6.4); // 设置人民币汇率为6.4

        // 以美元为基准兑换人民币
        double amountInUSD = 100.0;
        double amountInCNY = converter.convertCurrency(amountInUSD, "USD", "CNY");
        System.out.println(amountInUSD + " USD = " + amountInCNY + " CNY");

        // 以人民币为基准兑换美元
        double amountInCNY2 = 640.0;
        double amountInUSD2 = converter.convertCurrency(amountInCNY2, "CNY", "USD");
        System.out.println(amountInCNY2 + " CNY = " + amountInUSD2 + " USD");
    }
}