Currency Converter

Libraries/Plug-ins Involved

• Java 8
• Maven
• Maven Wrapper
• Spring Boot
• Google Guava Table (docs)
• JUnit & Mockito

Rates and References

Currency Rates

The given currency rates are pulled out from src/main/resources/input/currency_rates.txt

Example of currency_rates.txt

AUDUSD=0.8371
CADUSD=0.8711
USDCNY=6.1715

Currency Cross References

The given cross references are pulled from src/main/resources/input/currency_cross_references.txt The file does not include any inverse references. Those are calculated runtime. If a conversion requires multiple cross references the direct rates and cross references are used recursively.

Example of currency_cross_references.txt

AUDCAD=USD
AUDCNY=USD
AUDCZK=USD
AUDDKK=USD
AUDEUR=USD
AUDGBP=USD
AUDJPY=USD
AUDNOK=USD
AUDNZD=USD

Currency Formats

The given currency format (decimal places) are pulled from src/main/resources/input/currency_formats.txt Once the currency conversion is done and before printing the result required decimal places are looked up based on the output currency and used for formatting the decimal places. Default decimal places are 2.

Example of currency_formats.txt

AUD=2
CAD=2
CNY=2
CZK=2

Running Project Locally

It is a maven based Spring-Boot application includes maven wrapper feature.

Running Unit Tests

./mvnw clean test

Starting Application

./mvnw spring-boot:run

Converting Currency

Once the application is started, currency conversion command can be provided like below

> AUD 100.00 in USD

Any invalid input will result in invalid input response

Exiting the Application

The application will keep on asking for next input. To exit the application simply type ctl + c or exit

> exit