For Beginners Java, Need Help

Design a GUI program to find the weighted average of four test scores. The four test scores and their respective weights are given in the following format: testscore1 weight1 ... For example, the sample data is as follows: 75 0.20 95 0.35 85 0.15 65 0.30 The user is supposed to enter the data and press a Calculate button. The program must display the weighted average.

As short and sweet as you can get it, PLEASE USE COMMENTS SO I CAN UNDERSTAND WHAT THE CODE MEANS.