2d platformer game, dont know how to implement a few features

Processing Coding Questions
1

I dont know how to make proper collision with jumping and how to not allow the player to jump more than once.

2

It seems like you are trying to use a boolean value canJump – how does it currently work?

This is a common approach – or using a jump counter, which allows a double-jump but not a triple…

3

I have implemented a working jump and stage but under a different, but public directory called platformer2

4

Great! So is your question resolved?

5

I have another problem but I am not at home to update the code