Yes, you can use the Processing’ IDE changing the mode in the upper right corner.
I prefer the online Web Editor because of the error checking.
For exemple, all the sketches on openprocessing.org are in P5.js and it is difficult to import them in Processing (but I would like to work this Java and not P5.js). How to? Thanks
Yes, it’s not really easy, because while both modes have java in their name, they are distinct languages. Java and JavaScript.
I suggest to play with the Mimim library, there are nice example sketches in the lib.
See also here.
You can still use Processing java there. It has two modes, but java is somewhat limited.
See here a java sketch on my channel.
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