Extras

Before moving on to the challenges, there are some last important operations.

To check if a file exists, you can use exists() method:

File fileObj = new File("file.txt");
if (fileObj.exists()) {
	System.out.println("file.txt exists!");
} else {
	System.out.println("file.txt not exists.");
}

Another two methods:

• mkdir() - Creates a directory.
• list() - Returns an array of the files in the directory (String[]).