This tutorial will teach you Profit and Commission Calculation using Java.while calculating the commission from the profit include 1% commission.
Paste the code inside the ok button
double buyprice = Double.parseDouble(txtbprice.getText());
double sellprice = Double.parseDouble(txtsprice.getText());
double Profit = sellprice - buyprice;
double Commision = Profit * 1/100;
I have attached the video tutorial below it will help you to do this step by step.