I got a question that asked me to write a actionPerformed me

I got a question that asked me to write a actionPerformed method for a calculator. it will print out the results of the two numbers adding together and prints out the number of decimal places. I’m not quite sure how to add (or multiple, divde , etc..) the two number input by the user and print out the number of decimal places. The question included two textfields one for displaying the numbers and one is to show how many decimal place it has…This question is really confusing me and this is due tomorrow, so I barerly have enough time to spend thinking and figuring out on my own.