Help with JAVA Swing!

Question

Here is what to do:

1.Launch the code
2.Draw something in the opened window
3.Change the size of the window with the help of your mouse. Just drag the border of your window to make it smaller or bigger.

You'll see that all content on the window disappeared.
So, my question is: how to make it stay there regardless of whatever happens to the window? Thank you! The code goes here:
https://code.sololearn.com/crmdkI9Q7b4x/?ref=app

Answer 1

If you want to fix this do the following
- Constantly Save Graphics Data
- Update JFrame / JPanel

You can achive this by using BufferedStradegy
https://docs.oracle.com/javase/7/docs/api/java/awt/image/BufferStrategy.html

Answer 2

Skrub Look like great solution! Thanks 👍