I believe it is your homework. You can not just say you do not know how to do it.
You need to indicate where you need help. Can you read data from the file?
Do you know how to use nextInt() method. If you do not know, try to find information.
Do you know how to draw the points by calling the PointPlotter.java provided by your teacher. ...
I will try to help. But I can not do it for you. If I do it for it. Then it is not really good for you, and it is not fair,either.
You need to learn the skill to be able to find a job later on in real world. ;)