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Also, does the OP want the values of the points to be displayed on the screen or the points themselves, or both?

I mean, does he/she want:

ex.
1.) Point 1: x = 100 y = 200
Point 2 : x =...

What's wrong with my post? I wasn't wrong about the MouseListener, the fact that there is no setX() or setY() in the Point class, or, as far as I know, that \ is an escape character.

This is probably not it but why do you have // twice in there?

er("E:\\app\\data.txt"))

Also, I think that \ is an escape character.

Are you sure you didn't mean

"E:/app/data.txt"