Making a Loto game (Lotto, Bingo)

Hello, I need for a school project to do a loto application in andoid. It is possible to do something like in the pictures below in processing ?

Can anyone help me with some examples/ideas please ?

Thank you.

How is it supposed to work?
You’ll need the random() function to place the circles contained in an ArrayList (where you can add and remove pieces. Best thing is to start coding a Piece Class I guess.
Another tip is: Do not use the word that starts with an ‘a’ but is missing a ‘r’ above because someone will re-categorize it to that, and you’ll have much less answers.
If it runs on the PC it will run on…well you know the thing.

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I think he meant a machine to choose numbers randomly: