Java Delete file directory, file code

Delete Directories in Java in advance to delete files or subdirectories under the directory. It can be achieved by recursion. This is my first algorithm to use the program, hey seems to have no white learning.
public void del (String filepath) throws ioexception{
FileName F = new file (filepath);//define Path
if (f.exists () && f.isdirectory ()) {//Judge is a file or directory
if (F.listfiles (). length==0) {//If there are no files in the directory, delete them directly
F.delete ();
}else{//if so, put the file in the array and determine if there is a subordinate directory
File Delfile[]=f.listfiles ();
int i =f.listfiles (). length;
for (int j=0;j<i;j++) {
if (Delfile[j].isdirectory ()) {

         del (Delfile[j].getabsolutepath ());//Recursively Call del Method and get subdirectory path
            }
            delfile[j].delete ()//delete file
&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP;&NBSP}
    }
    del ( filepath);//Recursive call
}
        
}