Open file in folder and subfolders

[GoToLoop]

@plux

… open every file in a folder and in each subfolders (recursively)…

You can use listPaths() for it:
Processing.GitHub.io/processing-javadocs/core/processing/core/PApplet.html#listPaths-java.lang.String-java.lang.String…-

And here’s an example for image files, which you can easily adapt for CSV 1s:

File Listing Order

Docs.Oracle.com/en/java/javase/11/docs/api/java.base/java/util/Arrays.html#sort(java.lang.Object[]) static final String PICS_EXTS = "extensions=,png,jpg,jpeg,gif,tif,tiff,tga,bmp,wbmp"; static final float FPS = .25; PImage[] images; void setup() { size(1200, 600); frameRate(FPS); imageMode(CENTER); final File dir = dataFile(""); println(dir); String[] imagePaths = {}; int imagesFound = 0; if (dir.isDirectory()) { imagePaths = listPaths(dir.getPath(), "files", "recursi…

Don’t forget Processing can also load CSV & TSV files via loadTable():

loadTable() / Reference