Java is a method instance that deletes files directories and all files in a directory

preface

The main function of this article is to delete a directory and all subdirectories and files under the directory. File.delete() Delete a file or empty directory! So to delete a directory and all the files and subdirectories in it, recursively delete.

The specific code example is as follows:

import java.io.File;

public class DeleteDirectory {
 /**
 *  Delete empty directory 
 * @param dir  The directory path to be deleted 
 */
 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);
 }
 }

 /**
 *  Recursively deletes all files in the directory and all files in the subdirectory 
 * @param dir  Directory of files to be deleted 
 * @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();
　　　　　　　// Recursively deletes subdirectories in a directory 
  for (int i=0; i<children.length; i++) {
  boolean success = deleteDir(new File(dir, children[i]));
  if (!success) {
   return false;
  }
  }
 }
 //  The directory is now empty and can be deleted 
 return dir.delete();
 }
 /**
 * test 
 */
 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);
 } 
 }
}

conclusion

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