Convert to JAva Program

It's actually for my sixth grade science class but I want to have a program to go along with my model. My dad said I should use JOptionpane but I don't know what that is. thanks for any help. Please don't answer if you aren't going to help thank you.

Environment: In an environment where it snows frequently during the winter, and rains frequently during the spring. Most people are going to work or school during 6:00am to 10:00am, and coming home during 4:00pm to 6:00pm. At noon there is a lunch rush.

Season:
Spring = 3
Summer=1
Fall=1
Winter=5

Time:
6:00am to 10:00am: 5
9:00am to 11:00am: 2
12:00pm: 4
12:00pm to 3:00pm: 1
3:00pm to 6:00pm: 5
6:00pm to 9:00pm: 2
9:00pm to 12:00pm: 2
Make a program that adds up the numbers of both the season and time. If the output is
2, 3, or 4: Print Traffic is Low
5, 6, 7: Print Traffic is Medium
8, 9, 10: Print Traffic High

See cross post at:
http://www.java-forums.org/new-java/45034-how-convert-into-program.html