move line

Hello everyone,
I am very new to java programming and I have a big problem now.
I have to make a program for my class and I'm very short with time.
It's a simple program but not for me.
PROGRAM:

application where customer gets a window and clicks on 2 spots and a line appears(between those spots).then he clicks on button "move the line"and gets a window where he chooses new destination for line (new coordinates ).and then the line moves where he wanted it to...
It's GUI application,and I'm willing to learn to make such a thing,but now I need this one for my class,so I need it made.

Thank you in advance
Hope someone will have time to help me,and hope I'll be able to help you back soon

Please post your current code and your questions about the problems you are having.

That's the problem
I don't know how to start.
I can't create it in my head-How it should be done...
If you could help me build it,or give me some directions...

Start by making a list of the steps the program needs to do to solve the problem.
Then work through those steps one by one.
Write the code for each step, compile and test it.
When it works, move to the next step.

If you have problems or questions post them here.