Write some Software

I need you to enhance a Java software for me. This Java software was developed for Windows use. The very original concept is in an excel and rewrite into to Java afterwards, thus, the existing Java has a bunch of simple calculations, around 30 input parameters and deliver 50000 output and it has a function to export the result in .csv. Current function in existing program [Import] get parameters from an excel [Clear] clear data on program [Calculate] calculate the result with the after the user select the calculation method [Export] Calculate and export the result into a .csv file [Selection table] There are a few calculation method already developed, this project is to add 3 additional methods to the existing program so that the user can select, calculation speed is important.