Java method examples for deleting files, directories and all files in the directory

Preface

The main function of this article is to delete a certain directory and all subdirectories and files under the directory. The knowledge points involved: File.delete() is used to delete "a certain file or empty file". Table of contents"! So to delete a directory and all the files and subdirectories in it, you need to delete it recursively.

The specific code examples are as follows:

import java.io.File;
 
public class DeleteDirectory {
 /**
 * 删除空目录
 * @param dir 将要删除的目录路径
 */
 private static void doDeleteEmptyDir(String dir) {
 boolean success = (new File(dir)).delete();
 if (success) {
  System.out.println("Successfully deleted empty directory: " + dir);
 } else {
  System.out.println("Failed to delete empty directory: " + dir);
 }
 }
 
 /**
 * 递归删除目录下的所有文件及子目录下所有文件
 * @param dir 将要删除的文件目录
 * @return boolean Returns "true" if all deletions were successful.
 *   If a deletion fails, the method stops attempting to
 *   delete and returns "false".
 */
 private static boolean deleteDir(File dir) {
 if (dir.isDirectory()) {
  String[] children = dir.list();
　　　　　　　//递归删除目录中的子目录下
  for (int i=0; i<children.length; i++) {
  boolean success = deleteDir(new File(dir, children[i]));
  if (!success) {
   return false;
  }
  }
 }
 // 目录此时为空，可以删除
 return dir.delete();
 }
 /**
 *测试
 */
 public static void main(String[] args) {
 doDeleteEmptyDir("new_dir1");
 String newDir2 = "new_dir2";
 boolean success = deleteDir(new File(newDir2));
 if (success) {
  System.out.println("Successfully deleted populated directory: " + newDir2);
 } else {
  System.out.println("Failed to delete populated directory: " + newDir2);
 } 
 }
}

Summary

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