GetQuote.java

HttpClientBuilder builder = HttpClientBuilder.create();
try (CloseableHttpClient httpClient = builder.build()) {
    HttpGet httpGet = new HttpGet("http://quote.yahoo.com/d/quotes.csv?s=" + from + to + "=X&f=l1&e=.csv");
    ResponseHandler<String> responseHandler = new BasicResponseHandler();
    String responseBody = httpClient.execute(httpGet, responseHandler);
    return parseDouble(responseBody);
} catch (IOException e) {
    throw new RuntimeException(e);
}