Class: Currency Exchange

This class can be used to obtain exchange rates for various currencies.

It accesses remote Web sites of banks and entities that provide currency exchange rate information and parses the site page data to obtain the name, country and exchange rate for each of the supported currencies.

Currently it can obtain information about 21 currencies from the Federal Reserve Bank of New York and the Bank of Canada.

The class can cache previously obtained currency exchange information to avoid remote site access overhead in subsequent queries.

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