How to write a code for paint in java.write a code for me

Answer 1

Which gui api? What do you want to paint?

Answer 2

I still don't know what you want to do.
If you want to print something kind of graphical to the console, you can have a look at this:
https://code.sololearn.com/cK0BzGrV9ROP/?ref=app
If you want to learn JavaFX, start here:
https://docs.oracle.com/javase/8/javafx/get-started-tutorial/

Answer 3

i want to paint java simple program