File file = new File("demo.txt");
if(!file.exists()){
file.createNewFile();
}
File dirs = new File(
"a" + File.separator +
"b" + File.separator +
"c" + File.separator +
"d" + File.separator +
"e" + File.separator +
"f" + File.separator +
"g" + File.separator +
"h" + File.separator +
"i");
if(!dirs.exists()){
dirs.mkdirs();
}