You need at least Java 8 to run program. You need at least maven 3.3 to build program. Run 'mvn test', 'mvn build', 'mvn package' to test and prepare jar file. Go to target folder. run 'java -jar bscdemo.jar' or 'java -jar bscdemo.jar path_to_file' Type 'quit' to terminate program. Type USD 10, USD 10.25, USD -50 etc to add currency.