知识点：File.delete()用于删除“某个文件或者空目录”！所以要删除某个目录及其中的所有文件和子目录，要进行递归删除，具体代码示例如下：

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