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File file = new File("read.txt");

try {
    file.createNewFile();
    file.renameTo(new File ("renamed.txt"));
    file.delete();
} catch (IOException e) {
    e.printStackTrace();
}

File dir = new File (".");

String s[] = dir.list();
for (String str : s)
    System.out.println(str);

System.out.println("------");

File files[] = dir.listFiles(f -> f.isFile());

for (File str : files)
    System.out.println(str.getName());

File dirTest = new File ("Test");
dirTest.mkdir();

File dirsTest = new File ("Test/Another");
dirTest.mkdirs();