CurrencyExchange
所属分类：Java编程
开发工具：Java
文件大小：95KB
下载次数：3
上传日期：2006-09-06 17:02:12
上 传 者：
lylrq
说明： This a JavaBean application, which contains 4 beans. In this package, there are 4 files:
cexchange.jar(ready to load into BeanBuilder),
readme.txt,
currencyData.txt(data file),
screenshot.jpg(linking beans)
(This a JavaBean application, which contains four beans. In this package, there are four files : cexchange.jar (ready to load into BeanBuilder ), readme.txt, currencyData.txt (data file). Screenshot (linking beans))
文件列表:
cexchange.jar (19176, 2006-08-22)
screenshot.jpg (65098, 2006-08-22)
currencyData.txt (49142, 2006-09-06)
This package includes four Beans as required, two Customizers and four custom Events with its corresponding listeners.
Beans: CurrencyExchange, QuoteProducer, Summarizer and Displayer.
Customizers: QuoteProducerCustomizer and SummaryChoiceCustomizer.
Custom Events: CurrencyEvent, QuoteEvent, ThresholdEvent and SummaryEvent.
Custom Event Listeners: CurrencyEventListener, QuoteEventListener, ThresholdEventListener and SummaryEventListener.
Working Principle:
1.CurrencyExchange reads the currency data file into a vector(currencylist) regularly, which is controled by a timer; then, fires a CurrencyEvent that contains the vector(currencylist);
2.QuoteProducer receives the CurrencyEvent from CurrencyExchange and deal with the currency data; the QuoteProducerCustomizer helps users to choose their interested currency and set its threshold in QuoteProducer bean; once currency price reaching the threshold, this bean fires ThresholdEvent; aslo, it fires QuoteEvent once for each CurrencyEvent it received;
3.Summarizer receives CurrencyEvent from CurrencyExchange and QuoteEvent from QuoteProducer; then it calculate these data as user required (default type is average), such as for maximum, minimum and average, the SummaryChoiceCustomizer gives users a interface to do so; after that, it sends out a SummaryEvent to Displayer;
4.Displayer receives two customized events: QuoteEvent from QuoteProducer for displaying particular currency that user is interested, and SummaryEvent from Summarizer for showing the calculate result that has been done in last step.
User Instruction:
please read the screenshot for details.
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