Java deletes all files under the specified path and all folders in the folder, excluding the folder

package file;

Import Java.io.File;

Deletes all files in the specified path, and all folders in the folder, excluding the folder public
class Filedel {public	
	static void Delallfiles (file file,string Singal) {
		if (!file.exists ()) {
			System.out.println ("The path is not present:" +file);
			return;
		}
		if (singal==null| | "". Equals (Singal)) {
			singal= "-";
		}			
		SYSTEM.OUT.PRINTLN (singal+) directory ["+file.getname () +"]: ");
		singal=singal+ "-";
		File[] Files=file.listfiles ();
			if (files.length>0) {	
				for (File f:files) {
					if (f.isdirectory ()) {//If it is a directory
						delallfiles (f, singal);	Recursive
						System.out.println (singal+ "directory [" +f.getname () + "] deleted");	
						F.delete ();		Delete this folder
					}
					else{
						System.out.println (singal+ file "+f.getname () +" "deleted");	
						F.delete ();
					} else
				}//for
			}//if
			else{
				System.out.println ("* * * * * * * * No files in this directory * * * *)";
			}		
	Static
	@SuppressWarnings ("static-access") public
	static void Main (string[] args) {
		Filedel tt=new Filedel ();
		Tt.delallfiles (New File ("G:\\ABC"), null);
	}