How to make the selectFolder() function open using a default path

Processing Coding Questions
4

//Processing Example for Loading Files · GitHub


// This is the Filetype we're gonna look for
String extensionToLookFor = ".jpg";

// ArrayList of loadedFiles
ArrayList<File> loadedFiles;
int fileToLoad = 0;
PImage loadedImage;

void setup()
{
	size(400,300);
	background(0);

	//selectFolder(String, String);
	selectFolder();
}

void draw()
{
	if(loadedImage == null || loadedFiles == null || loadedFiles.size() <= 0) 
		return;

	background(0);

	image(loadedImage, 0, 0, width, height);
}

void keyPressed()
{
	switch(key)
	{
		case ' ':
		fileToLoad ++;
		if(fileToLoad >= loadedFiles.size())
			fileToLoad = 0;
		String imgPath = loadedFiles.get(fileToLoad).getAbsolutePath();
		println("Load: " + imgPath);
		loadedImage = loadImage(imgPath);
		break;

		case 'l':
		selectFolder();
		break;
	}
}

void selectFolder()
{
	// Opens Window to select a folder or file from
	// then Calls a Method with the selected File as Parameter
	selectFolder("Select a Folder", "loadFiles");
}

void loadFiles(File selection)
{
	// if nothing was selected
	if(selection == null)
	{
		println("User hit cancel");
		// open the Window again
		selectFolder();
		// and skip all code below by returning
		return;
	}

	// this is the absolutePath (just for Debugging)
	String selectedPath = selection.getAbsolutePath();
	println("Path selected: " + selectedPath); 

	// now get all Files with the right Extension
	loadedFiles = getFilesFromFolder(selection, extensionToLookFor);
	println("Found Files: " + loadedFiles.size());
	fileToLoad = 0;
	loadedImage = loadImage(loadedFiles.get(fileToLoad).getAbsolutePath());
	//loadedImages = loadImagesFromFiles(loadedFiles);
}

// Method that returns all Files with a specific Extension in a Folder
ArrayList<File> getFilesFromFolder(File selectedFolder, String extension)
{
	// all files
	File[] allFiles = selectedFolder.listFiles();
	// only Files with the extension:
	ArrayList<File> files = new ArrayList<File>();
	// loop all Files
	for (int i = 0; i < allFiles.length; i++) 
	{
		File f = allFiles[i];
		// skip files without the right extension
		if( !hasExtension(f, extension) ) continue;
		// if not skipped -> add it to arraylist
		files.add(f);
	}
	// return found files
	return files;
}

// Helper Method to check for a files Extension
boolean hasExtension(File file, String extension)
{
	// the absolute path to the file
	String filePath = file.getAbsolutePath();
	// make the Path and the Extension to LowerCase (because ".JPG" == ".jpg" !!!)
	filePath.toLowerCase(); 
	extension.toLowerCase();

	// get the last characters of the path as they should contain the extension of the file
	// like for example: /someFolder/someFile.jpg
	// last character minus the length of the extension = index of first extension char
	int extensionStart = filePath.length() - extension.length();
	// index of last char in filePath
	int extensionEnd = filePath.length();
	// just the last chars of the filePath:
	String filePathExtension = filePath.substring( extensionStart, extensionEnd );
	
	// if the filePathExtension = is the extension we're looking for
	if(filePathExtension.equals(extension))
	{	
		// end here with true
		println("Right Extension: " + extension);
		return true;
	}
	else
		println("Wrong Extension: " + filePathExtension);

	// file has not the extension we looked for
	return false;
}


// Unused Methods:

// Method for Loading all Files in PImage ArrayList
// Beware: might be very memory consuming
ArrayList<PImage> loadImagesFromFiles(ArrayList<File> files)
{
	ArrayList<PImage> imgs = new ArrayList<PImage>();

	for(File f : files)
	{
		PImage img;
		String imgPath = f.getAbsolutePath();
		println("Load Image: " + imgPath);
		img = loadImage(imgPath);
		imgs.add(img);
	}

	return imgs;
}


// to be checked out:
// https://processing.org/discourse/beta/num_1212084677.html
/*

// have a look in the data folder
java.io.File folder = new java.io.File(dataPath(""));

// this is the filter (returns true if file's extension is .jpg)
java.io.FilenameFilter jpgFilter = new java.io.FilenameFilter() {
 boolean accept(File dir, String name) {
   return name.toLowerCase().endsWith(".jpg");
 }
};

// list the files in the data folder
String[] filenames = folder.list(jpgFilter);


*/