递归删除文件目录的方法

import java.io.File;

public class deleteFile {
 private static int j = 0;
 private static boolean deleteNode(File folder) {
  boolean delete = false;
  
  if (folder.isDirectory()) {
   int childrenNum = folder.listFiles().length;
   if (folder.listFiles().length > 0) {
    for (int i = 0; i < childrenNum; i++) {
     System.out.println(folder.listFiles()[0]);
     j++;
     System.out.println(j);
     deleteNode(folder.listFiles()[0]);
    }
   }
   delete = folder.delete();
  } else {
   delete = folder.delete();
  }
  return delete;
 }
 public static void main(String[] args) {
  File f = new File("E:\\workspace\\hel" +
    "p");
  deleteNode(f);
  

 }

}